Shop interface relays, relay sockets and thermal overload relays for control panels, pump sets and automation circuits across the UAE — the ABB CR-P and CR-M pluggable ranges with the bases they seat in.
What do c/o, coil voltage and contact rating mean?
c/o means changeover: one set of contacts that makes one circuit while breaking another. A 1c/o relay has one, 2c/o two, 4c/o four. Coil voltage (marked A1-A2) is the control signal that operates the relay — 24V AC and 230V AC are the usual ones here, and it must match your control supply, not the load. Contact rating is what the output side can switch, and more contacts generally means less current each: a 1c/o CR-P is rated 16A at 250V, a 4c/o CR-M 6A.
Will the base fit the relay?
Bases are not interchangeable across ranges. A CR-PLS logical socket takes 1c/o or 2c/o CR-P relays; a CR-M4SS standard socket takes 2c/o or 4c/o CR-M relays; PCB-mount sockets suit board assembly rather than DIN rail. Order relay and base as a pair and check the range letter — a CR-M relay will not seat in a CR-P socket.
Interface relay or overload relay?
They do different jobs. An interface relay switches a control circuit. A thermal overload relay such as the TF42-29 works with a contactor to protect a motor, tripping on sustained overcurrent and set within a band — 24 to 29A on that model. Set it from the motor nameplate, and leave commissioning to the electrician signing off the panel.
