1SYF272027R1404

The ABB DSB202M AC-C40/30mA, part number 1SYF272027R1404, is a two-pole residual current circuit breaker with overcurrent protection (RCBO) designed to protect compatible low-voltage electrical circuits against overloads, short circuits and earth-leakage faults.

The device has a rated current of 40 A, a C-type tripping characteristic and a rated residual operating current of 30 mA (0.03 A). Its Type AC residual-current detection responds to sinusoidal alternating residual currents. The two-pole configuration enables switching of compatible single-phase circuits, while its four-module construction supports DIN-rail installation in electrical distribution boards and control panels.

The RCBO combines overcurrent protection and residual-current detection in a single device. Its 30 mA sensitivity provides additional protection against electric shock when correctly selected and installed. It is suitable for residential, commercial and industrial applications where the current rating, cable capacity and prospective fault current are appropriate. Installation should follow ABB's technical documentation and applicable electrical standards.