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ABB S203-K5 — 3-Pole MCB (DIN Rail)

S203-K5 ABB S200 Series 5A K-Curve 3-Pole Miniature Circuit

MPNS203-K5

ABB S200 series, S203-K5, 3-pole miniature circuit breaker / supplemental protector, 5 A, K-curve, 480Y/277 VAC, 6 kAIC, DIN-rail mount.

$22.23Ref. price · indicative, final on quote
ABB S203-K5 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S203-K5 — Identification
ParameterValue
Number of poles3
S203-K5 — Electrical
ParameterValue
Voltage (AC)480
Current (A)5
S203-K5 — Protection
ParameterValue
Interrupting rating (AC)6 kA
S203-K5 — Mechanical
ParameterValue
Mounting typeDIN Rail
S203-K5 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

It carries a 480Y/277 VAC rating and a 6 kA interrupting capacity, classified as a UL 1077 supplemental protector.

The DIN-rail footprint clips directly into a standard 35 mm rail, so it swaps into an existing S200-series panel without rework.

Listed under UL 1077 and CSA 22.2 as a supplemental protector — not a branch-circuit rated breaker (UL 489), so it's intended for internal equipment protection rather than service entrance or feeder duty. The S200 series carries CE marking and RoHS compliance per ABB's standard declaration. For a BOM freeze or quality doc-control pass, the UL/CSA listing and manufacturer's declaration of conformity are available on request.

Frequently asked questions

What is S203-K5's listed amps and trip curve?

The S203-K5 is rated 5 A with a K-curve trip characteristic. The K-curve's magnetic trip threshold (10–14× In) handles moderate inrush from motor or transformer loads.

Will S203-K5 drop into a panel that was specified around S203M-C50 without rewiring?

No — the S203M-C50 is a 50 A C-curve breaker; the S203-K5 is a 5 A K-curve. Both share the same 3-pole DIN-rail footprint and S200 series form factor, so the physical swap is possible, but the current rating and trip characteristic differ completely. A direct replacement would require verifying the load's ampacity and coordination study.

Where can I buy S203-K5?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here.

MPN
S203-K5