ABB 1MRS050729 Auxiliary Contact Block (1NO + 1NC)

Description

The ABB 1MRS050729 operates as the primary power supply module in the REF615 relay chassis, residing at the base layer of substation automation stacks to convert high-voltage inputs into regulated DC rails (+5 V logic, +24 V for I/O) that energize the processor, analog front-end, and digital outputs. It mounts in the rear panel of the REF615 enclosure, drawing from station batteries or AC sources via screw terminals, then distributes power through the internal bus to core modules like the CPU or CT/VT cards, incorporating DC-DC converters for isolation that prevents ground loops in multi-bay setups. In action, it auto-ranges inputs and monitors output stability, triggering a fail-safe alarm if rails deviate beyond 5%, while coordinating with redundant supplies for seamless failover in under 10 ms—critical for maintaining protection continuity during faults.