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Interface Relays & Optocouplers

Enabling Power and Communication

ABB’s interface relays and optocouplers provide reliable voltage conversion between process peripherals and higher-level control systems. Our relays ensure reliable signal switching and provide electrical isolation for sensitive electronics such as PLCs in all kinds of machinery. The wide variety of pluggable interface relays with standard or logic sockets can be used for switching AC or DC loads. Suitable for extreme environments, ABB’s interface relays offer a range of different coil voltages and plug-in functional modules. Environmentally friendly, cadmium-free and lead-free, ABB interface relays and optocouplers meet RoHS requirements. Complete versions consisting of a relay, socket, holder, marker and function module are available in this range.


  • Safe and reliable voltage conversion
  • Highest contact ratings
  • Pluggable function modules for the highest application requirements


  • Coil voltages from 5 V DC up to 230 V AC
  • Up to 16 A contact ratings
  • Up to 4 output contacts
  • Pluggable function modules such as RC elements available
  • Integrated test button for manual operation
  • Gold plated contacts available for lowest contact resistivity
The CR-M range is our miniature solution to link the electronic controlling to the sensor/actor level.
The CR-P pluggable PCB can be directly soldered on a Printed Circuit Board or as a plugged on a socket.
CR-S Space-saving interface relays and optocouplers
The CR-U range is our universal applicable part of the interface relays assortment that can be extended with accessories like the timing module.
The boxed interface relays were built directly in the housing, therefore, providing the perfect solution to fulfill the highest vibration requirements.