SHRAP-400-3F

Airfield power connector SHRAP-400-3F

SHRAP-400-3F is an airfield electrical connector used to connect a ground power unit to the aircraft onboard power system. It is intended for external three-phase AC power supply during ground servicing, engine start preparation, equipment checks and operation of onboard electrical systems without using onboard generators. The connector is used as a matched pair: the aircraft-mounted plug is installed on the airframe, while the cable socket is fitted to the flexible power cable of the ground power unit.

SHRAP-400-3F connection to aircraft ground power

In operation, SHRAP-400-3F links the aircraft electrical system with an airfield power source, usually an APA-type ground power unit. The connector carries high-current three-phase AC power and allows the aircraft to receive external electrical supply before engine start or during maintenance. It is not an automatic control unit. Its role is physical and electrical connection, so the condition of contacts, insulation, cable termination and housing directly affects safe power transfer.

Aircraft plug and cable socket of SHRAP-400-3F

The SHRAP-400-3F set consists of two mating parts. The aircraft plug is mounted permanently in a special access hatch on the fuselage or helicopter airframe and normally includes a protective cover and mounting flange. The cable socket is installed on the power cable of the ground supply unit. It is the movable part handled by ground personnel during connection and disconnection. The design has no rigid lock, which allows emergency separation if the aircraft or ground unit moves unexpectedly.

Materials and installation features of SHRAP-400-3F

The connector uses contacts made from copper alloys. Socket contacts are silver-plated, while plug pins are nickel-plated to reduce contact resistance and improve wear resistance. The housing is made from aluminium alloy with anodic oxide protective coating. Cable cores are connected by soldering. For correct installation, the power cable cross-section and auxiliary control wires must match the technical documentation. Poor soldering, worn contacts or damaged housing can cause heating under load.

Identification and ordering of SHRAP-400-3F

Before ordering, it is important to specify which part is required: aircraft plug, cable socket, or a complete matched connector set. Dimensions and weight differ between the aircraft-mounted and cable-mounted parts. For aircraft maintenance or ground equipment repair, provide the required version, cable type, conductor cross-section, and photos of the existing connector if possible. The product is also known under alternative designations SHRAP-400-3F, ShRAP-400-3F and ШРАП-400-3Ф.

Product Type: Airfield electrical power connector
Function: Connection of ground power source to aircraft onboard electrical system
Application / Where Used: Aircraft ground power supply, engine start preparation, ground servicing
System / Installation Area: External power supply connector / aircraft ground power interface
Part of System / Included in Set: Aircraft-mounted plug and cable socket
Compatible Equipment: Ground power units / APA-type airfield power sources
Current Type: Three-phase alternating current
Rated Current: 400 A
Operating Voltage: 200 V
Rated Frequency: 400 Hz
Connection Life: Up to 3000 mating / unmating cycles
Locking Type: Without rigid lock; retained by contact friction and connector design
Contact Material: Copper alloys
Contact Plating: Socket contacts silver-plated; plug pins nickel-plated
Housing Material: Aluminium alloy with anodic oxide protective coating
Cable Connection Method: Soldering
Aircraft Plug Dimensions: 152.0 × 305.0 × 212.0 mm
Aircraft Plug Weight: Not more than 2.6 kg
Cable Socket Dimensions: Approx. 255 × 135 × 155 mm
Cable Socket Weight: Not more than 1.35 kg, excluding cable
Main Power Cable Cross-Section: 95 mm², recommended BPVLA cable, one conductor per each of three power contacts
Auxiliary Wire Cross-Section: 2.5 mm², BPVL wire
Technical Documentation: Technical specifications, installation documentation, ground power equipment documentation

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