All couplers consist of two vertical pin strips 110-M assembled back-to-back with continuous pins for both pin strips. This allows plugging and coding on both sides. In addition, pin strips with connecting flange can be screw connected with each other or alternatively with plug connectors. Rotating one pin strip generates the R-variant (R for reverse), on which pole markings of both plug connectors match. Advantages: • Pre-assembled functional units can be quickly connected and disconnected • Shorter assembly times, easier unit exchange • Current handling capability identical to all other 110-products • Coding possibility • Printed upon request with markings readable in plugged condition • Easier maintenance and trouble-shooting.