1SYF272027R2404

The ABB DSB202M AC-C40/0.1, part number 1SYF272027R2404, 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.

It has a rated current of 40 A, a C-type tripping characteristic and a rated residual operating current of 100 mA (0.1 A). Its Type AC residual-current detection is designed to respond to sinusoidal alternating residual currents. The two-pole configuration supports switching of compatible single-phase circuits, while its four-module design allows DIN-rail mounting in electrical distribution boards and control panels.

The device combines overcurrent protection and residual-current detection in a single unit. It is suitable for electrical distribution applications where its ratings and protection characteristics meet the installation requirements. A 100 mA residual-current setting 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.