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ABB S203-D40 — 3-Pole MCB (DIN Rail)

ABB S203-D40 Miniature Circuit Breaker, 40A, 3-Pole, D Curve

MPNS203-D40

ABB System pro M compact S203-D40, 3-pole miniature circuit breaker, 40 A, D trip curve, 480Y/277 VAC, 10 kA interrupting capacity, DIN rail mount.

$22.86Ref. price · indicative, final on quote
ABB S203-D40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S203-D40 — Identification
ParameterValue
Number of poles3
S203-D40 — Electrical
ParameterValue
Voltage (AC)277
Current (A)40
S203-D40 — Protection
ParameterValue
Interrupting rating (AC)10 kA
S203-D40 — Mechanical
ParameterValue
Mounting typeDIN Rail
S203-D40 — Other specifications
ParameterValue
TypeTrip Curve D

Product details

The ABB S203-D40 is a 3-pole miniature circuit breaker rated 40 A with a D trip curve, designed for DIN-rail mounting in distribution boards. The 10 kA interrupting rating at 480Y/277 VAC tells you it can safely clear a fault up to that level without welding contacts or cascading upstream; match this to your available fault current at the panel.

Panel integration note

The 3-pole body occupies three modular units (17.5 mm per pole) in the distribution board. Thermal-magnetic trip mechanism — no external power required for the trip unit. Terminals accept up to 25 mm² conductor; torque to 2.5 Nm per the terminal marking.

Frequently asked questions

What is the interrupting rating of the S203-D40?

The S203-D40 has a 10 kA interrupting rating at 480Y/277 VAC, sufficient for most commercial and light industrial panelboards.

Will the S203-D40 drop into a panel specified around the S203-C10?

Physically yes — both are 3-pole DIN-rail breakers with the same footprint. The difference is the trip curve: D curve (S203-D40) handles higher inrush than C curve (S203-C10). If the panel was designed for motor or transformer loads, the D curve is actually the better fit. For resistive or general-purpose loads, the C curve may be preferred to avoid a less sensitive trip characteristic.

Where can I buy the S203-D40?

The S203-D40 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commitment.

MPN
S203-D40