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

Hands-on research

What's in the box?

Download owner's manual

  • SPST Dual Make relay
  • Socket with 5 attached wires (red/white/black/blue/green)
  • Instruction/Application sheet

Product Research

Features

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.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Be the first to review this product
Great Gear Giveaway

Submit a review and then enter to win a $500 rewards card

Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left