The ABB 1SVR450099R0000 is a CM-KRN series contact protection relay with a 24V AC rated control supply voltage. Its function is contact protection — it suppresses arcing and voltage spikes across switching contacts in inductive load circuits, extending the life of the primary switching device. The output is configured as 2 c/o (SPDT) contacts, giving you two independent changeover channels per unit.
Dimensions are 45 mm width, 78 mm height, and 100 mm depth — a standard 45 mm wide module that snaps onto DIN rail alongside other control gear. Termination is via screw terminals, which is the expected interface for panel wiring in industrial control cabinets.