Compared to domestic AC power plugs and sockets, DC connectors have many more standard types that are not interchangeable. The dimensions and arrangement of DC connectors can be chosen to prevent accidental interconnection of incompatible sources and loads. Types vary from small coaxial connectors used to power portable electronic devices from AC adapters to connectors used for automotive accessories and for battery packs in portable equipment.
Small cylindrical connectors come in various sizes. They may be known as "coaxial power connectors," "barrel connectors," "concentric barrel connectors," or "tip connectors."
These plugs are intended for use on the cable connected to an external AC adapter (power supply). The matching jack or socket is permanently fitted to power the equipment. Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect battery recharging.
Cylindrical plugs usually have an insulated tip constructed to accept the insertion of a pin. The outer body of the plug is one contact, most often but not always the negative side of the supply. Inverted polarity plugs can and do damage circuitry when plugged in, even if the voltage is correct; not all equipment is equipped with protection. A pin mounted in the socket makes contact with a second internal contact. The outer plug contact is often called the barrel, sleeve, or ring, while the inner is called the tip.
There are a wide variety of sizes and designs for these power connectors, and many appear pretty similar to each other yet are not quite mechanically or electrically compatible. In addition to many generic designs (whose original designer is unknown), there are at least two national standards—EIAJ in Japan and DIN in Germany, plus the JSBP connector used on some laptop computers. The Japanese EIAJ standard includes five sizes, each supporting a specified range of voltages. However, most other coaxial DC power connectors have no specified voltage association. Generic plugs are often named for the pin diameter they are designed to take.
Many non-proprietary co-axial power plugs are 5.5mm (0.22in) in outside diameter (OD) and 9.5mm (0.37in) in length. Two pin sizes are standard in the jacks for this size plug body, 2.1mm (0.083in) and 2.5mm (0.098in), and the plugs should match. If the size is not known, it is difficult to distinguish by eye or measurement between the 2.1mm and 2.5mm ID plugs; some suppliers suggest simple methods.[1]
Maximum current ratings commonly vary from unspecified up to 5A (11A for unique high-power versions from some companies[2]), with 1A, 2A, and 5A being common values.[3] The smaller types usually have lower ratings, both for current and voltage. The 'tip' (i.e., the inner conductor) usually carries the positive (+) pole, but some devices and their power supplies use the negative tip. The connector size does not usually indicate the voltage. It is not possible, except for some proprietary connectors, to reliably infer any information on power parameters (current, voltage, polarity, even whether AC or DC) by examining the connector.
Snap and lock DC power connectors
A male 4-pin "Kycon" power connector, which appears similar to a Mini-DIN connectorRight-angle DC connector
Snap and lock DC power connectors look similar to Mini-DIN connectors but have either 3 or 4 thicker pins and a slightly larger mating shell. Because of this, they do not mate with any of the standardized Mini-DIN connectors. Some devices, however, use a proper 4-pin Mini-DIN connector for power instead, presenting the possibility of mating such a connector with the wrong port (such as an S-Video output).
Known as Kycon 3-pin and 4-pin DC power plugs.
Erroneously also known as "Power DIN",[4] although different from any standardized Mini-DIN or DIN connector type.
The male plug's mating shell outer diameter is 10mm (0.39in), and the pins are 1.5mm (0.059in) diameter
Standard may include a limit of 20V at 7.5 amperes[5]
Sometimes, there's a knurled retaining ring surrounding the male plug which allows fastening the plug to the chassis receiving the power.
Some connectors have a right-angle connector, as seen in the picture.
For aesthetics, some Dell laptop chargers have a glowing ring at the connector tip.
Molex connectors were frequently used as DC power connectors in personal computers, for floppy, hard disk, and CD drives. These connectors have four pins, +5V (red), 2 common ground (black), and +12V (yellow). SATA peripherals use a different style of connector.
Locking Molex connectors are available in 3, 4, and 6 terminal configurations.
XT connectors
Solder cup terminals are primarily designed for the in-line solder termination of conductors. This style of terminal is principally designed as a precision-machined pin for insertion into connector bodies.[6]
IEC 60906-3:1994
The International Electrotechnical Commission (IEC) has produced a standard for a system of 2-pin plugs and socket-outlets for household and similar purposes in fixed and portable applications, either indoors or outdoors. Safety extra-low voltage (SELV) plugs and socket-outlets carry up to 16 amperes, and have eight keying possibilities, to indicate 6, 12, 24, or 48 volts, AC or DC.
The connector is circular, with the male connector having two pins placed symmetrically inside a circular shield, and the female connector having two receptacles surrounded by a circular groove to accept the male shield, in turn surrounded by a second circular shield which projects 6mm (0.24in) past the mating surface and encloses the male connector. (It somewhat resembles a smaller IEC 60309 connector.)
The male shield has two keys projecting inwards, which fit into notches in the female body. The larger key is at right angles to the pins, 2.0±0.1mm (0.079±0.004in) wide and ending at a radius of 4.9±0.1mm (0.193±0.004in) from the connector centre. The corresponding notch is 2.3±0.1mm (0.091±0.004in) wide and ends at a radius of 4.6±0.1mm (0.181±0.004in) from the connector centre.
The angle of the second key from the first indicates the voltage and current type. The eight permitted angles are multiples of 30° which are not multiples of 90°. Angles of ±30° and ±60° indicate alternating current (50 or 60Hz), while angles of ±120° or ±150° indicate direct current with the pin at 90° being negative and the pin at 270° being positive.
The second key is smaller than the first, 1.5±0.1mm (0.059±0.004in) wide ending at a radius of 6.4±0.1mm (0.252±0.004in) from the connector centre. The corresponding notch in the female connector body is 1.8±0.1mm (0.071±0.004in) wide and ends at a radius of 6.2±0.1mm (0.244±0.004in) from the connector centre.
With the angles measured clockwise looking at the female connector (counter-clockwise looking at the male), the various key positions indicate:
Angle
Supply
30°
6 V AC
60°
12 V AC
120°
6 V DC
150°
12 V DC
210°
24 V DC
240°
48 V DC
300°
24 V AC
330°
48 V AC
The so-called "Mini IEC connectors" are unrelated and not even standardized by the IEC at all; they are called that because they resemble a smaller IEC C13 connector.
The JST RCY-series connector is a 2.5mm-pitch and manufactured by J.S.T. Mfg. Co., Ltd.[8] It is known in radio control circles as the battery eliminator circuit (BEC) or P connector. JST also produces other types of connectors that are used in R/C and hobby electronics.[9]
Deans style T-Plug
Deans style T-Plug
The Deans style T-Plug connector is a polarized high power plug that inhibits accidental reversed connections. This also applies in particular to avoid the LiPo flash, which can cause burn injuries or related damage. Depending on the make, Deans plugs are sensitive to overheating during soldering, as the plastic can become soft and the plug surfaces can easily twist. Depending on the construction, they can support currents up to 40A (pulse to 70A)[citation needed].
Usual pin assignment T-Plug: negative (-) is the parallel pin; positive (+) is the perpendicular pin.
Inverter tabs/lugs
Inverter lugs
Inverter tabs/lugs are available in 2, 4, and 8AWG. These are designed to pass very high currents at voltages up to 600VDC to and from battery packs, inverters, and other high-current loads to a terminal bus.
Two different airline in-seat power supply system (ISPSS) standards for DC power have been used in the past. American Airlines in the past used an automobile auxiliary power outlet. Most other airlines that provide DC power use the smaller EmPower system, which has a 4-pin Hypertronics' D-series connector. It can supply 15 volts maximum 5 amperes.
Powerpole connectors are a series developed by Anderson Power Products[10] and available in a variety of sizes and colors. The commonly used 15/30/45 series connectors are interoperable and use the same housings but different contacts for different wire sizes and current requirements.
Powerpole connectors are physically and electrically genderless, thus avoiding the need to worry about which end is the plug and which the socket, or which end has the correct polarity, as is the case with the physically but not electrically genderless two-wire trailer plug.
Powerpoles have been adopted as a standard 12VDC connector by most RACES Radio Amateur Civil Emergency Service organizations and ARES Amateur Radio Emergency Service units. They deliver good current capability for their sizes and facilitate very easy pluggability for those without good eyesight or good lighting. However, they can be damaged relatively quickly and, if not correctly crimped, can occasionally separate from each other easily with minimal force unless additional retaining measures are taken.
Although the plug is physically hermaphroditic, and any SAE connector can be connected to any other SAE connector, they are NOT electrically hermaphroditic, and care needs to be taken to maintain correct polarity when connecting different plugs.
This connector typically applies a maintenance charge to a vehicle battery. When installed in a vehicle and attached to a battery, the polarity of the connector is always such that no short circuit will occur if the exposed terminal touches the vehicle chassis. In most vehicles, this means that the exposed terminal connects to the battery's negative terminal. Conversely, the positive terminal on a battery charger is exposed to mate with the concealed one on the vehicle side. (This is reversed on vehicles with a positive-ground frame, such as vintage British motorcycles.)
Although there is a risk of short-circuiting a battery charger, the risk is minimal and often mitigated by the circuitry of the battery charger itself. On the other hand, the short-circuit current of the lead–acid batteries installed in vehicles is sufficiently great that a short circuit could result in a fire or explosion. The priority is therefore given to avoiding short circuits of the vehicle battery rather than the charger.
Although the term "SAE connector" is commonly used to refer to the pictured two-pin connector, many different connector standards are designated by SAE International which may also be referred to by this term. Furthermore, while the design of the subject connector was inspired by and based on SAE Standards, the connector itself has no official SAE designation.
Upon researching, we found that there is no specification addressing the SAE 2 Pin overmold connector. SAE (Society of Automotive Engineers) Specification J928 addresses “Electrical Terminals – Pin and Receptacle Type” and SAE J1239 addresses 4, 5, and 8 pin trailer connectors, but there doesn’t seem to be an SAE specification for the 2 pin overmold configuration.
Seems the 2 pin overmold configuration was sort of a spin off developed in the early ’80’s using the spacing from the SAE 4 pin connector addressed by SAE J1239. So, technically speaking, the 2 pin configuration is not governed by any SAE standard, but they were developed to be compliant with SAE J928 and J1239.
Certainly, the SAE perspective was toward automotive applications, including: trailer hitch/lighting wiring, onboard mechanisms (such as power windows), and battery maintenance.
The automobile auxiliary power outlet is also called a cigarette lighter receptacle, or cigar lighter receptacle, since it was originally designed as a lighter for cigars—hence its rather large size. Nowadays, it is used to power automotive accessories such as portable inverters, mobile phone chargers and portable refrigerators.
These sockets were not originally designed to provide DC power, and are not an ideal DC connector for several reasons[citation needed], but still widely used for compatibility to existing accessories. Three sizes exist, one for 6VDC and two for 12VDC[citation needed] and the mating of the different sized 12VDC plugs and jacks is problematic.[citation needed] Because of this, and the small gauge wire sometimes used, they may provide unreliable power connections.[citation needed]
The polarity for 12VDC sockets is center pin positive (+), outer collar negative (−). Reversed polarity will damage some electronic devices.
Although the nominal voltage of a 12V lead acid battery is 12VDC, when the engine is running the car's battery charging system will bring the system voltage to 13.8VDC or higher.[10] The possible range of battery voltages from 11–15VDC must be taken into account by devices attached to the cigar lighter socket.
This connector is also often used for powering accessories on motorcycles, such as heated clothing (vests, gloves, etc.) or GPS units. This makes "plugging in" easier to manage while wearing gloves. As the accessory lacks any power of its own, there's no risk of "shorting" the exposed connector.[citation needed]
In the broadcast, film, and television industries, the 4-pin XLR connector is the standard for 12 V power. The connectors are wired pin 1 negative, pin 4 positive. Often pins 1 and 2 will be negative, 3 and 4 positive for a higher current rating. Female connectors are used as supply and male connectors are used on loads. Most battery belts and power supplies output 13.2V, but equipment can usually handle a range of 11–18 volts to accommodate battery packs of varying voltages and charging while operating.
The readily available XLR3 is also used by some manufacturers as power supply plugs despite their being a well-accepted standard for other purposes.
Clipsal connectors
Clipsal 492/32 DC plug, not wired
In Australia, a T-configuration Clipsal socket is used for extra-low voltage DC power outlets, such as in stand-alone power systems (SAPS) or on boats, in order to prevent accidental connections of 12V appliances into 240 V socket-outlets.[11] This connector is also used for temporary equipment in emergency vehicles.
The connector pins are mutually perpendicular, and are usually oriented to look like a capital T. Polarity at the outlet can be random, and must be verified to avoid equipment damage.
USB socket
Micro-B USB
Due to the popularity of USB for mobile phones and tablets, USB sockets and plugs have become a common choice for other small devices that require five volts or less, even those that require no data connection. Examples include flashlights, toys such as small helicopters, and rechargeable battery packs (which in turn provide five volts over USB to recharge other devices). Wall sockets with built-in USB power adapters and USB sockets are available.
In 2009, the EU created a common external power supply specification, a voluntary specification which encouraged mobile phone manufacturers to use the micro USB-B connector. As of 2016, most new mobile phones used this connector for charging.[citation needed]
In 2012, the USB Power Delivery (PD) specification was released. The USB PD specification provides the ability for 5V devices to draw more than (the USB battery-charging specification limit of) 7.5W of power from USB "PD-aware" ports when using PD-aware USB cables. The specification also allows USB PD ports to provide even greater power at higher voltages over PD-aware cables – up to 36W at 12V and 60W at 20V (for micro-USB connectors) and up to 60W at 12V and 100W at 20V (for standard USB A/B connectors).[12]
The 12-inch 2015 MacBook uses a USB-C port for charging
After previous connectors were deprecated in USB 3.2, the new USB-C plug has become a new standard for charging (and data transfer) over USB.[13]
Heathkit power supply female connector for tube equipment
There are a number of similar design PC board power connectors, including Molex Mini-Fit SR, Molex Mini-fit jr., MOLEX MICROFIT and Molex SABRE connectors, and AMP DUAC connectors that look similar to each other.
Some plugs with three, four, five or more pins are also called DC plugs. These were common on vacuum tube equipment and continue to be used where several voltages are supplied. On vacuum tube equipment the pins are normally on the equipment side of the join for safety reasons.
Many mobile phones use DC connectors that are unique to the manufacturer, or even a specific phone. In the interest of improved interoperability of phone battery chargers, major manufacturers have agreed to standardize on the micro-USB connector for new phone chargers from 2010.[16]
Many manufacturers make special-purpose DC power connectors for battery packs, instruments, medical equipment, communications equipment and other devices.
Power Pack (PP) series of batteries such as the PP3 nine-volt battery have circular and hexagonal terminals which mate with a "snap" connector with physically identical (but opposite-polarity) terminals.
Special "octal" connectors with either 8 or 11 pins, almost identical to octal relay sockets or tube sockets, were used to connect power supplies to some tube audio amplifiers, transmitters, and transceivers (especially in amateur radio models). Female sockets were installed on the power supply and male sockets (with exposed pins) on the radio equipment. Cable assemblies with mating connectors were also readily available. These connections transferred anode positive voltage (typically 600VDC for Heathkit, 800VDC for Collins), grid negative bias (−130VDC), 6.3 and 12.6VAC for heaters (filaments), and control functions (remote mains switching).
Low voltage (120–1,500 VDC)
These low voltage connectors are rated at or below 1,500VDC.
Anderson SBS
The Anderson SBS[17] and SBS Mini series of connectors are rated at up to 600VDC at (depending on the connector) 50A, 75A or 110A. They are only rated for disconnection under load at up to 120VDC however.[17]
These connectors see use as battery bank connectors in higher power UPS systems, where the battery bank voltages are between 48VDC and 500VDC.
MC4 connectors are common on photovoltaic panels. Because these panels are exposed to the weather for decades, MC4 includes a rubber sealing ring to keep out moisture. Because solar panels are often stacked in strings of hundreds of volts, MC4 has locking clips to hold the wires together. Because solar panels can be connected in series strings, or parallel arrays, the positive and negative terminals use separate connectors.
IEC TS 62735
IEC TS 62735 plug and socket, 2.6kW versionComparison of 2.6 kW IEC TS 62735 (left) and IEC320 C14 (right) inlets for receiving powerComparison of 2.6 kW IEC TS 62735 (left) and IEC320 C13 (right) outlets for supplying power
The IEC TS 62735 standard[18] specifies connectors capable of carrying between 294 and 400VDC. There are two connectors in the standard rated at 2.6kW and 5.2kW.[19] The lower current plug can be inserted into the higher current socket, but the higher current plug will not mate with the lower current socket. The 2.6 kW plug can be disconnected under load, but the 5.2kW plug cannot.[20]
Designed primarily for supplying power to computer and communications equipment, these connectors are intended to allow data centers to migrate towards supplying equipment with DC power as an alternative to AC.
Saf-D-Grid
The Saf-D-Grid[21] connector delivers up to 600VDC at up to 30A, with the connector occupying the same space as an IEC 320 C13/C14 connector normally limited to 250VAC at 10A. The connector can also be disconnected under load.
Like the IEC 62735, this connector was designed to replace the IEC connector used in computer power supplies so that they can be operated from 380–400VDC instead. Introduced in January 2009,[22] it arrived before the competing IEC standard, however despite this it has not seen widespread use.
Molex Imperium
The Imperium connector from Molex is aimed at automotive applications and is rated at 1,000VDC at 250A.[23] As of 2021 the manufacturer has classed this connector as obsolete.[24]
Vehicle charging connectors
In order to avoid heavy transformers onboard vehicles, high power charging of battery electric vehicles has the transformers in the ground station, and supply to the vehicle is done with DC at around 400 volts.
These high voltage connectors are rated for voltages above 1,500VDC.
Banana connector
The Banana connector, normally only rated for extra-low voltage, is available in a high voltage variant as well. This version of the connector contains a thick shroud around both male and female connectors, permitting use at voltages of up to 30kV. The shroud is typically deep enough to prevent connection by traditional banana plugs. This style of connector is often seen on high voltage test equipment, such as power supplies and volt meters capable of handling 10 kV and above.
The XLR connector is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage power supply. XLR connectors are part of the international standard for dimensions, IEC 61076-2-103. The XLR connector resembles the DIN connector, but is larger, more robust and physically incompatible.
Phantom power, in the context of professional audio equipment, is DC electric power equally applied to both signal wires in balanced microphone cables, forming a phantom circuit, to operate microphones that contain active electronic circuitry. It is best known as a convenient power source for condenser microphones, though many active direct boxes also use it. The technique is also used in other applications where power supply and signal communication take place over the same wires.
AC power plugs and sockets connect devices to mains electricity to supply them with electrical power. A plug is the connector attached to an electrically-operated device, often via a cable. A socket is fixed in place, often on the internal walls of buildings, and is connected to an AC electrical circuit. Inserting the plug into the socket allows the device to draw power from this circuit.
IEC 60309 is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes". They are also referred to as "pin & sleeve" connectors in North America or as "CeeForm" connectors in the entertainment industry. The maximum voltage allowed by the standard is 1000 V DC or AC; the maximum current, 800 A; and the maximum frequency, 500 Hz. The ambient temperature range is −25 °C to 40 °C.
An AC adapter or AC/DC adapter is a type of external power supply, often enclosed in a case similar to an AC plug. AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves. The internal circuitry of an external power supply is often very similar to the design that would be used for a built-in or internal supply.
A coaxial power connector is an electrical power connector used for attaching extra-low voltage devices such as consumer electronics to external electricity. Also known as barrel connectors, concentric barrel connectors or tip connectors, these small cylindrical connectors come in an enormous variety of sizes.
An automobile auxiliary power outlet in an automobile was initially designed to power an electrically heated cigarette lighter, but became a de facto standard DC connector to supply electrical power for portable accessories used in or near an automobile directly from the vehicle's electrical system. Such include mobile phone chargers, cooling fans, portable fridges, electric air pumps, and power inverters.
A charging station, also known as a charge point, chargepoint, or electric vehicle supply equipment (EVSE), is a power supply device that supplies electrical power for recharging plug-in electric vehicles.
Universal charger or common charger refers to various projects to standardize the connectors of power supplies, particularly for battery-powered devices.
SAE J1772, also known as a J plug or Type 1 connector after its international standard, IEC 62196 Type 1, is a North American standard for electrical connectors for electric vehicles maintained by SAE International under the formal title "SAE Surface Vehicle Recommended Practice J1772, SAE Electric Vehicle Conductive Charge Coupler".
IEC 62196Plugs, socket-outlets, vehicle connectors and vehicle inlets – Conductive charging of electric vehicles is a series of international standards that define requirements and tests for plugs, socket-outlets, vehicle connectors and vehicle inlets for conductive charging of electric vehicles and is maintained by the technical subcommittee SC 23H “Plugs, Socket-outlets and Couplers for industrial and similar applications, and for Electric Vehicles” of the International Electrotechnical Commission (IEC).
The common external power supply was a European Commission (EC) specification for a universal charger for smartphones sold within the European Union. The specification included the use of a USB Micro-B connector and adherence to the USB Battery Charging Specification.
The Anderson Powerpole is a family of electrical connectors by Anderson Power Products (APP), although plug compatible connectors are now available from alternate sources. Specific variants of this series of connectors have become de facto standards for conveying "higher power" direct current (DC) electrical power, although these standards are inconsistent and sometimes ignored.
Plugs and sockets for electrical appliances not hardwired to mains electricity originated in the United Kingdom in the 1870s and were initially two-pin designs. These were usually sold as a mating pair, but gradually de facto and then official standards arose to enable the interchange of compatible devices. British standards have proliferated throughout large parts of the former British Empire.
The IEC 62196 Type 2 connector is used for charging electric vehicles, mainly within Europe, as it was declared standard by the EU. Based on widespread red IEC 60309 three phase plugs with five pins, which come in different diameters according to maximum current, a single size was selected, as maximum possible power will be communicated to the car via two additional communication pins and by a simple resistor coding within the cable. The onboard charger inside the car has to limit the current accordingly.
SAE J3068 "Electric Vehicle Power Transfer System Using a Three-Phase Capable Coupler" is a North American recommended practice published and maintained by SAE International. J3068 defines electrical connectors and a control protocol for electric vehicles. It has the formal title "SAE Surface Vehicle Recommended Practice J3068". J3068 defines a system of conductive power transfer to an electric vehicle using a coupler capable of transferring single-phase and three-phase AC power as well as DC power, and defines a digital communication system for control. J3068 also specifies requirements for the vehicle inlet, supply equipment connector, mating housings and contacts.
The initial versions of the USB standard specified connectors that were easy to use and that would have acceptable life spans; revisions of the standard added smaller connectors useful for compact portable devices. Higher-speed development of the USB standard gave rise to another family of connectors to permit additional data paths. All versions of USB specify cable properties; version 3.x cables include additional data paths. The USB standard included power supply to peripheral devices; modern versions of the standard extend the power delivery limits for battery charging and devices requiring up to 240 watts. USB has been selected as the standard charging format for many mobile phones, reducing the proliferation of proprietary chargers.
The GB/T charging standard is a set of GB/T standards, primarily in the GB/T 20234 family, for electric vehicle AC and DC fast charging used in China. The standards were revised and updated most recently in 2015 by the Standardization Administration of China. The term is an abbreviation of 国标推荐 (guóbiāo/tuījiàn), translated as "recommended/voluntary national standard".
The ChaoJi connector, also referenced as CHAdeMO 3.0, is an ultra-high-power charging standard charging electric cars, released in 2020. The connector has a lemniscate shape (∞), with a flat bottom edge and is planned for charging battery electric vehicles at up to 900 kilowatts using direct current. The design incorporates backward compatibility with CHAdeMO and the GB/T DC-charging, using a dedicated inlet adapter for each system. The circuit interface of ChaoJi is also designed to be fully compatible with the Combined Charging System, also known as CCS.
The IEC 62196 Type 3 connector is used for charging battery electric vehicles, mainly within France and Italy, as it was one of three AC plug standards described in IEC 62196-2. The Type 3 connector comes in two physical formats, Type 3A for single-phase (230V) and Type 3C for single- and three-phase (400V) alternating current (AC) power. Both have since been superseded by the Type 2 connector, the latter adopted as sole connector in 2013 by the European Union. The Type 1 connector is the corresponding AC connector standard used in North America, Japan, and South Korea.
Patent: US 7,033,209Vehicle accessory power connector – includes diagrams of SAE connector
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