From lock to normally closed to changeover

The basic types of relays differ based on the function of their contacts:

• The lock: It closes the circuit when the Relays are energized. In the de-energized state, the contact is open.
• The normally open contact: It breaks the circuit when the relay is activated. In the off state, the contact is closed.
• The changeover contact: Depending on the switching state, it connects a common contact to one of two connections, thereby enabling switching between two circuits

The flasher or turn signal relay

Indicator relays handle the time-controlled interruption of the circuit, thereby producing the characteristic flashing of the turn indicators. They are available in various versions, for example, for 6 V or 12 V, as well as for alternating current (AC) or direct current (DC). The number and arrangement of the contacts must also be taken into account.

In addition, there are load-dependent and load-independent variants. The latter ensure a correct flashing frequency even when the electrical load changes, such as when using LED indicators.

Selection and Compatibility

When selecting a relay, in addition to the switching function, particular attention must be paid to the operating voltage, current-carrying capacity, and, of course, the pin configuration. The design and dimensions must also fit the available seating. Depending on the model, relays are suitable for a wide variety of tasks within the vehicle’s electrical system.

Conclusion: The wide variety of Relays enables solutions for a wide range of circuits and installation spaces.