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ABB S203P-K50 — 3-Pole MCB (DIN Rail)

S203P-K50 50A 3-Pole K-Curve MCB, 10 kA DIN Rail

MPNS203P-K50

ABB S203P-K50 miniature circuit breaker, 3-pole, 50 A, Trip Curve K, 277 VAC, 10 kA interrupting capacity, DIN rail mount.

$83.82Ref. price · indicative, final on quote
ABB S203P-K50 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S203P-K50 — Identification
ParameterValue
Number of poles3
S203P-K50 — Electrical
ParameterValue
Voltage (AC)277
Current (A)50
S203P-K50 — Protection
ParameterValue
Interrupting rating (AC)10 kA
S203P-K50 — Mechanical
ParameterValue
Mounting typeDIN Rail
S203P-K50 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

The Trip Curve K characteristic means it's built for motor and transformer loads — the magnetic trip kicks in at 8-14x rated current, fast enough to catch a locked rotor without nuisance-tripping on startup inrush.

Snaps onto standard DIN rail — no screws, no bracket. Three poles in a single module width, so it fits a 3-phase motor branch circuit or a three-phase distribution subfeed. The 277 VAC phase-to-neutral rating makes it right for 480Y/277 V panels common in North American commercial and light industrial gear.

Frequently asked questions

What is S203P-K50's interrupting capacity?

10 kA at 277 VAC. That's the maximum fault current it can safely break without damage — adequate for most commercial and light industrial panelboards where the available fault current stays under that level.

Where can I buy S203P-K50?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here.

Will S203P-K50 drop into a panel specified for S204-C32?

Not without changes. S204-C32 is a 4-pole, 32 A, Curve C breaker — different pole count, lower amp rating, and a different trip curve (C trips at 5-10x, K at 8-14x). The S203P-K50 is 3-pole and 50 A, so it won't simply swap in without rewiring and coordination review.

MPN
S203P-K50