DSE201 Series Type AC RCBO's ABB DSE201 series are 1P+N residual current circuit breaker with overcurrent protection (RCBO) in one module. For the protection against short circuit currents, overload, earth fault currents, indirect contacts and additional protection against direct contacts. DSE201 is equipped with supply neutral wire and functional earth wire. ABB RCBO's & RCCB's RCBO's : DIN rail mounting with an operating temperature range of -25 to +55 °C. Optimum frequency range of 50 to 60Hz