The ABB S403M-C40 is a 3-pole miniature circuit breaker from the S400 series, rated 40 A with Trip Curve C and a 10 kA interrupting capacity at 240 V AC. For a panel fed from a transformer with a known fault level under 10 kA, this holds — above that, you need an upstream current-limiting device or a higher-rated breaker. Mounts on standard DIN rail, so it clips into any 35 mm rail in the enclosure without extra hardware.
ABB S403M-C40 MCB, 40A 3P Curve C, 10kA
MPNS403M-C40
ABB S400 series S403M-C40 miniature circuit breaker, 40 A, 3-pole, 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 |
|---|---|
| Number of poles | 3 |
| Parameter | Value |
|---|---|
| Voltage (AC) | 240 |
| Current (A) | 40 |
| Parameter | Value |
|---|---|
| Interrupting rating (AC) | 10 kA |
| Parameter | Value |
|---|---|
| Mounting type | DIN Rail |
| Parameter | Value |
|---|---|
| Type | Trip Curve C |
| Family (Style) | S400 |
Product details
Frequently asked questions
What is the interrupting rating of the S403M-C40?
The S403M-C40 is rated for 10 kA interrupting capacity at 240 V AC. That means it can safely clear a short-circuit fault up to 10,000 A without failing.
What does Trip Curve C mean on this breaker?
Trip Curve C means the magnetic instantaneous trip activates at 5 to 10 times the rated current (200–400 A for this 40 A breaker). It is designed for general-purpose loads with moderate inrush — lighting, small motors, distribution panels — where you need to avoid nuisance trips on start-up.
Where can I buy the S403M-C40 and get current pricing?
The S403M-C40 is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing — no stock or price figures are published here.
MPN
S403M-C40