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Key elements

Relays allow the safe switching of high currents via small control currents. In your electrical system, they perform tasks such as switching components (e.g. light, ventilation, auxiliary systems) on or off based on signals. A well-chosen relay solution is essential for reliability and controllability.

Function and voltage

In the store you will find relays for various applications – such as flasher units, micro relays or working current relays with different amperages. These variants cover different requirements and can be flexibly integrated into electronic systems.

Relay

What should you look out for when buying:

FUNCTION

Select a relay that supports your desired control functions – e.g. flashing frequency, alternating switching or continuous current.

CURRENT CLASS

Make sure that the relay is designed for your on-board voltage (12 V, 24 V etc.) and electrical load.

TYPE OF CONSTRUCTION

The relay plug, the design (micro, operating current) and the pin assignment must match your existing electrical system.

Expert Guide: Everything You Need to Know About Relays

A relay allows high currents to be switched safely using a small control current. In automotive electrical systems, it turns components such as lights, ventilation, or auxiliary systems on and off based on a control signal. This allows high-power loads to be switched reliably without placing a strain on the sensitive control wires.

In the relay, a small control current generates a magnetic field through a coil, which moves a switching contact. This closes or opens a separate, high-power circuit. The control circuit and the load circuit are thus decoupled from each other, which protects the sensitive control electronics from high currents.

Depending on the intended application, there are various designs, such as flashing units, micro-relays, or operating-current relays with different amperage ratings. They meet a range of requirements—from flashing frequency and alternating circuits to continuous switching of high loads.

Typical signs include loads that do not switch on at all or only switch on intermittently, a continuous audible clicking sound, an irregular flashing frequency, and functions that fail completely. Since relays are central switching elements, a defective relay can often be easily replaced with a compatible replacement part.

Choose a relay that supports your control function—such as flashing frequency, changeover switching, or continuous current. Make sure it is rated for your vehicle’s voltage (12 V, 24 V) and electrical load, and that the connector, form factor, and pinout are compatible with your existing electrical system.

Optimize your vehicle control!

With the right relays, you can increase flexibility, protect your electrical system and implement robust control functions. Take a look at the options and equip your system optimally.