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ABB S401M-C40NP — 1-Pole MCB (DIN Rail)

ABB S401M-C40NP S400 MCB, 1P, 40A, Curve C, 10kA

MPNS401M-C40NP

ABB S400 series, S401M-C40NP, 1-pole miniature circuit breaker, 40 A, Trip Curve C, 240 VAC, 10 kA interrupting capacity, DIN rail mount.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

S401M-C40NP — Specifications
ParameterValue
Amps40
TypeTrip Curve C
Poles1
MountingDIN Rail
Volts AC240
Family (Style)S400
Breaking capacity10 kA

Product details

The ABB S401M-C40NP is a 1-pole S400 series miniature circuit breaker rated 40 A with a Trip Curve C characteristic. It interrupts faults up to 10 kA at 240 VAC, which covers most commercial and light industrial panelboard applications where the available fault current stays under that threshold. The Curve C means it trips between 5× and 10× rated current — standard for general-purpose loads like lighting, small motors, and control transformers where you want to ride out modest inrush without nuisance trips.

Panel fit and lifecycle

Snaps onto standard DIN rail — same footprint as any 1-pole S400-series MCB. Lifecycle stage is current; ABB still manufactures this order code.

Frequently asked questions

Will S401M-C40NP drop into a panel specified around S201MUC-K25 without rewiring?

Both mount on standard DIN rail and are 1-pole units, so the physical footprint matches. However, the S201MUC-K25 is a 25 A Curve K breaker rated 277 VAC with 6 kA interrupting capacity. The S401M-C40NP is 40 A Curve C at 240 VAC with 10 kA. Check the load current and fault current rating before swapping — the curve and ratings differ.

MPN
S401M-C40NP