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ABB S803U-K100 — 3-Pole MCB (DIN Rail)

S803U-K100 Miniature Circuit Breaker, 100A, 3P, Curve K

MPNS803U-K100

ABB S803U-K100, miniature circuit breaker, DIN rail mount, 100 A, 3-pole, 240 VAC, Trip Curve K, 50 kA interrupting rating.

$509.64Ref. price · indicative, final on quote
ABB S803U-K100 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S803U-K100 — Identification
ParameterValue
Number of poles3
S803U-K100 — Electrical
ParameterValue
Voltage (AC)240
Current (A)100
S803U-K100 — Protection
ParameterValue
Interrupting rating (AC)50 kA
S803U-K100 — Mechanical
ParameterValue
Mounting typeDIN Rail
S803U-K100 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

The ABB S803U-K100 is a 3-pole miniature circuit breaker rated 100 A at 240 VAC, with a Trip Curve K characteristic and a 50 kA interrupting rating.

The 100 A continuous rating and Curve K trip characteristic are the key selection parameters here. Curve K trips magnetically at 8–12× rated current, which is tighter than a D curve (10–14×) but slower than a Z curve. That's high enough for most industrial service-entrance or sub-distribution panels fed by a transformer with substantial short-circuit capacity.

Frequently asked questions

Where can I buy S803U-K100 and how do I get a price?

The S803U-K100 is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing.

What is S803U-K100's listed amps and trip curve?

The S803U-K100 is rated 100 A continuous with a Trip Curve K characteristic (magnetic trip at 8–12× In). It is a 3-pole breaker for 240 VAC circuits.

Will S803U-K100 drop into a panel specified around S203-C10?

No — the S203-C10 is a 10 A, Curve C breaker with a 10 kA interrupting rating at 277 VAC. The S803U-K100 is 100 A, Curve K, 50 kA at 240 VAC. They share the same DIN-rail footprint but serve completely different load and fault-current requirements. A panel built for the S203-C10 would need bus and conductor upgrades to handle 100 A.

MPN
S803U-K100