2CSR275075R3204

The ABB DSB201M AC-C20/0.3, part number 2CSR275075R3204, is a residual current circuit breaker with overcurrent protection (RCBO) designed to provide combined protection against overloads, short circuits and earth-leakage faults in compatible low-voltage electrical installations.

This device has a rated current of 20 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 1P+N configuration is suitable for compatible single-phase circuits, and the compact two-module design supports DIN-rail installation in electrical distribution boards and control panels.

The device is intended for residential, commercial and industrial electrical distribution applications where a 20 A circuit rating and 300 mA residual-current protection are appropriate. The correct selection depends on the connected load, prospective short-circuit current, earthing arrangement and applicable electrical standards. Installation should be performed by a qualified electrician in accordance with ABB's technical documentation.