The ABB S401M-C63 is a 1-pole miniature circuit breaker from the S400 family, rated 63 A with a Trip Curve C characteristic. It mounts on a standard DIN rail and interrupts faults up to 10 kA at 240 V AC — enough for most branch-circuit protection in residential and light commercial panels. The Curve C trip (5–10× In) means it handles moderate inrush from motor starters and transformers without nuisance tripping, while still clearing a hard short fast.
ABB S401M-C63 MCB, 1P, 63 A, Curve C, 10 kA
MPNS401M-C63
ABB S400 series, MCB, 1-pole, 63 A, Trip Curve C, 240 V AC, 10 kA interrupting capacity, DIN rail mount.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Amps | 63 |
| Type | Trip Curve C |
| Poles | 1 |
| Mounting | DIN Rail |
| Volts AC | 240 |
| Family (Style) | S400 |
| Breaking capacity | 10 kA |
Product details
Frequently asked questions
What is the interrupting rating of the S401M-C63?
10 kA at 240 V AC. That's the maximum fault current it can safely interrupt under standard test conditions.
Where can I buy the S401M-C63?
Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
Will the S401M-C63 drop into a panel built for the S201MUC-K2?
The DIN-rail footprint is the same, but the S401M-C63 is rated 63 A with a C-curve and 10 kA interrupting capacity, versus 2 A, K-curve, and 6 kA for the S201MUC-K2. It is not a direct functional replacement without rewiring and re-evaluating the branch circuit.
MPN
S401M-C63