This Harmony RSZ range is a plug-in socket. This plug-in relay socket is compatible with interface plug-in relay RSB range. This product is for RSB1A/RSB2A relays. It is compatible with RSB with 1 C/O contact, 16A, RSB1A160 and 2 C/O contact, 8A, RSB2A080 relays. it has a rated voltage of 250V AC with an output rating of 10A. It is a green premium product and conforms to international standard and certifications.