Coupling relays are primarily used after a digital output. Relay and semiconductor outputs are available for this purpose. Choosing which output is the better suited will depend on the application. Relay couplers are standard for AC signals. SIRIUS interface relays are available in compact sizes, 6.2mm wide up to 36mm wide (Power Relay.

Variations:

Mechanical Relay
Semiconductor Relay or Opto-couplers
Power Relays

Semiconductors are primarily used for switching DC loads and high switching frequencies.

SIRIUS Relays (3RH)

The SIRIUS coupling relays to switch motors and auxiliary and control circuits have been especially designed to operate with electronic control systems.

The contactors distinguish themselves as a result of their low power drain and the wide operating range of the solenoids. The high contact reliability of the auxiliary contacts guarantees that there are no fault signals - even at low switching powers.

Sensitive output stages are protected against switching overvoltages of the coil using an integrated surge suppressor.

They are designed for AC or DC operation and are available with screw or Cage Clamp connection systems. The basic version of the contactor relays has 4 poles but this can be extended up to 8 poles using auxiliary contact blocks, which can be snapped-on.