1SYF272027R3254

The ABB DSB202M AC-C25/300mA, part number 1SYF272027R3254, is a two-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 for sinusoidal alternating residual currents. The two-pole configuration supports switching of compatible single-phase circuits, while its four-module construction allows DIN-rail mounting in electrical distribution boards and control panels.

The RCBO combines overcurrent protection and residual-current detection in a single device. It is suitable for residential, commercial and industrial distribution applications where the specified current rating, leakage sensitivity and breaking capacity meet the installation requirements. 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.