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Plug-In Relays

Plug-in Relays
We offer a variety of reliable automotive plug-in relays for lighting, starting, horn, and heating and cooling control, as well as time-delayed engine shutdown and high-current contact switching. Our plug-in relay types include time delay relays, ISO Micro relays, ISO Mini relays, ISO Power relays, and high-power dc coil relays. In addition, you will find weatherproof, dovetailing plug-in relay sockets that accept high-power and heavy-duty plug-in relays as well as standard ISO relays.
  • ISO Micro relays, ISO Mini relays, and ISO power relays are available in Form A and Form C in a wide range of configurations
  • Options for 12 V dc and 24 V dc systems
  • Keeps costs down by switching a high-current circuit with a low-current signal
  • Compact, modular relays let you tailor your vehicle's hard-wired box for the capability you need

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Frequently Asked Questions

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What are plug-in relays?

Plug-in relays are for controlling various vehicle functions, such as lighting, starting, horns, and heating and cooling. They can also be used for time-delayed engine shutdown and high-current contact switching. The compact, modular design of plug-in relays allows a vehicle's hard-wired box to be outfitted with various capabilities. Littelfuse offers a broad range of

How do plug-in relays work?

Relays switch a circuit requiring a higher current with a low-current signal. The primary or control circuit features an electromagnetic coil that produces a magnetic field when electricity passes through it. In a normally open relay, when the magnetic field is energized, it attracts an armature that moves one contact toward another fixed contact, which completes the