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Bosch E5100

SPST Dual Make Relay

Item # 120E5100

Discontinued item

Item # 120E5100

About the Bosch E5100

The Bosch E5100 single pole-single throw (SPST) relay is used in car security installations, primarily for interfacing with certain parking light circuits.

What's in the box:

  • SPST Dual Make relay
  • Socket with 5 attached wires (red/white/black/blue/green)
  • Instruction/Application sheet
MFR #E-5100C

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Crutchfield response

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More details on the Bosch E5100

Russ B.

Product Research


Overview: This item is a Bosch SPST (single-pole, single throw) dual make relay. When 12 volts is delivered to the coil of the relay, the input terminal of the relay makes a connection with two output terminals. Sending current through the relay's coil, allows you to turn on one or more devices without touching them. The relay consists of two parts: the relay, which includes a 5-blade socket, and the 5-blade plug with 5 wires. It has a capacity for up to 30 Amps.

Typical Applications:

  • Relay Turn-On: turning on/off high-current devices such as multiple amplifiers or neon lights using a low current trigger, such as a head unit's amplifier turn on lead
  • Relay Turn-Off: for turning off or disabling a device such as a vehicle's starter system (in conjunction with a security system)
  • Remote Trunk Release: for remote control opening of a vehicle trunk (in conjunction with a security system--requires existing power-assisted trunk release)
  • Power Door Lock System: for remote control locking/unlocking of vehicle doors (in conjunction with a security system and aftermarket power door locks)

Wiring Considerations: Installation of this relay requires splicing or soldering of the connections. Installation of a 30-amp fuse and fuse holder may be required near the battery connection.

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