What this relay does
The ABB 1SVR730120R3100 is a CT-ARS.11S time relay configured for true off-delay operation. That means the output contacts change state immediately when the control signal is applied, then return to their original position after a preset time delay once the signal is removed — a sequence used in conveyor sequencing, pump-down cycles, and fan run-on after a process stop. The SPDT (single-pole double-throw) contact arrangement gives you one normally-open and one normally-closed set, so you can switch a load and signal a status back to the PLC on the same relay.