ABB 2CDS383001R0404 S303P-C40 3P 40A 20kA DIN Rail Miniature Circuit Breaker (MCB)

ABB's S300P series 2CDS383001R0404 (S303P-C40) is a 3-pole, 40 A miniature circuit breaker with a Curve C trip and 20 kA breaking capacity at 415 V AC, dual-certified to IEC/EN 60898-1 and IEC/EN 60947-2. Its UL 1077 rating adds 10 kA interrupting capacity at 480Y/277 V AC for mixed IEC/UL installations.

Technical Specifications

Certifications & Standards

• IEC/EN 60898-1
• IEC/EN 60947-2
• UL 1077
• CSA 22.2 No. 235

Selection Notes

At 40 A, Icn is 20 kA at 415 V AC, the same ceiling as the 32 A frame in the S303P-C family and a step down from the 25 kA held by the 20 A variant. This is adequate for most industrial boards, but where the prospective fault current at the installation point approaches 20 kA, verify the upstream protection's let-through energy before relying on this breaker alone. Curve C's 5-10 x In magnetic trip threshold matches loads with moderate inrush rather than purely resistive circuits. The 3-pole configuration switches all three phases without disconnecting the neutral, the standard choice for balanced three-phase loads on a TN-S system.