1SYF274027R3254

The ABB DSB204M AC-C25/300mA, part number 1SYF274027R3254, is a four-pole residual current circuit breaker with overcurrent protection (RCBO) designed to protect compatible low-voltage electrical installations 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 300 mA (0.3 A). Its Type AC residual-current detection is designed to respond to sinusoidal alternating residual currents. The four-pole configuration supports compatible three-phase, four-wire systems, including neutral switching. The device is designed for DIN-rail installation in electrical distribution boards and control panels.

This RCBO combines overcurrent protection and residual-current detection in a single device. It is suitable for residential, commercial and industrial electrical distribution applications where the current rating, cable capacity, fault-current conditions and leakage-protection requirements are appropriate. The 300 mA sensitivity is generally used for installation or equipment protection and does not replace 30 mA additional protection against electric shock where required. Installation should follow ABB's technical documentation and applicable electrical standards.