ABB 2CSS255101R0205 SN201-B20 1P+N 20A B-Curve 6kA Miniature Circuit Breaker (MCB)

ABB's SN201-B20 (SKU 2CSS255101R0205) extends the SN201 1P+N miniature circuit breaker line to 20 A while keeping the same type B curve, 6 kA breaking capacity at 230 V AC, and 1-module width as its lower-current siblings. The right-mounted neutral terminal and screw-cage terminals accept conductors from 0.75 to 16 mm², and the B-curve's 3-5× In instantaneous trip keeps it suited to resistive and lightly inductive circuits rather than motor loads.

Technical Specifications

Certifications & Standards

• IEC/EN 60898-1

Selection Notes

The SN201-B20's 20 A rating sits toward the middle of the SN201 range, still built around the same type B curve and 1-module, 18 mm housing as the rest of the family. Use it where the connected resistive or lightly inductive load's full current sits close to 20 A, since running a lower-rated device near its limit shortens contact life under repeated switching. Its 6 kA breaking capacity at 230 V AC matches typical domestic and light-commercial fault levels, so no upstream current-limiting device is normally needed.