1SYF272027R1254

The ABB DSB202M AC-C25/30mA, product code 1SYF272027R1254, is a two-pole residual current circuit breaker with overcurrent protection (RCBO) designed to protect electrical circuits against overloads, short circuits and earth-leakage faults.

The device has a rated current of 25 A, a C-type tripping characteristic and a rated residual operating current of 30 mA (0.03 A). Its Type AC residual-current detection is designed to respond to sinusoidal alternating residual currents. The two-pole design enables switching and protection of compatible single-phase circuits, while its four-module construction is suitable for DIN-rail installation in electrical distribution boards.

This RCBO combines thermal-magnetic overcurrent protection with residual-current detection in one device. It is intended for residential, commercial and industrial electrical installations where 30 mA additional protection against electric shock is required. Selection must account for the load, cable capacity, prospective fault current and applicable electrical standards. Installation should be performed by a qualified electrician in accordance with ABB's technical documentation.