1SYF272027R3634

The ABB DSB202M AC-C63/300mA, part number 1SYF272027R3634, 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 63 A, a C-type tripping characteristic and a rated residual operating current of 300 mA (0.3 A). It uses Type AC residual-current detection and is designed for compatible single-phase electrical installations. Its four-module construction supports DIN-rail mounting in distribution boards and electrical panels.

This device combines overcurrent protection and residual-current detection in one unit. It is suitable for residential, commercial and industrial electrical distribution applications where the current rating, leakage sensitivity and breaking capacity meet the installation requirements. A 300 mA sensitivity is generally used for installation or equipment protection and does not replace 30 mA additional protection against electric shock where required. Selection and installation should follow ABB's technical documentation and applicable electrical standards.