ABB DS301CA-B20/0.03 RCBO, 1P+N, 20 A, 30 mA, Type A, B Curve, 6 kA 2CSR255163R1205

Electricians and panel builders install the ABB DS301CA-B20/0.03 RCBO in residential and commercial distribution boards to protect circuits against overload, short-circuit, and residual current faults. This 1P+N device combines an MCB and an RCD in a two-module-wide housing, saving space on the DIN rail.

Key specifications

• Rated current: 20 A
• Rated residual operating current: 30 mA
• Tripping characteristic: B
• Rated short-circuit breaking capacity: 6 kA
• Residual current type: A (AC and pulsating DC)
• Rated voltage: 230 V AC
• Frequency: 50/60 Hz
• Number of poles: 1P+N
• Number of modules: 2
• Mounting: DIN rail
• Terminal type: screw terminals
• Terminal capacity: 25 mm² rigid, 16 mm² flexible
• Tightening torque: 2.8 N·m
• Electrical endurance: 10,000 cycles
• Mechanical endurance: 20,000 cycles
• Degree of protection: IP20

Why choose it

The DS301CA-B20/0.03 offers reliable protection for people and equipment. Its Type A residual current detection covers both AC and pulsating DC faults, making it suitable for circuits with electronic loads. The B curve ensures fast tripping on short circuits while avoiding nuisance trips from inrush currents.

Ideal use cases

• Protection of socket outlet circuits in homes and offices
• Circuits supplying washing machines, dishwashers, and other appliances with electronic controls
• Distribution boards where space is limited and combined protection is needed

Good to know

The device complies with IEC/EN 61009-1 and IEC/EN 61009-2-1. It is designed for DIN rail mounting and has a rated voltage of 230 V AC. The screw terminals accept conductors up to 25 mm² rigid or 16 mm² flexible, with a recommended tightening torque of 2.8 N·m.