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ABB S802S-UCB125 — 2-Pole MCB (DIN Rail)

S802S-UCB125 ABB S802S High Perf MCB, 2P, 125A, Curve B

MPNS802S-UCB125

ABB S802S-UCB125, High Performance Miniature Circuit Breaker, 2 Pole, 125 Amp, Trip Curve B, 480 VAC / 250 VDC, 50 kA interrupting rating, DIN Rail mount.

ABB S802S-UCB125 datasheet (PDF)
StockContact for availability
Lead timeCall for availability wk
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026

Specifications

Specifications

S802S-UCB125 — Specifications
ParameterValue
Amps125
TypeTrip Curve B
Poles2
MountingDIN Rail
Volts AC480
Volts DC250
Breaking capacity50 kA
Interrupt rating DC50 kA

Product details

What this 125 A curve-B MCB does for your panel

The ABB S802S-UCB125 is a 2-pole high-performance miniature circuit breaker rated 125 A with Trip Curve B, meaning it trips magnetically between 3× and 5× rated current — fast enough to clear a hard short before downstream devices take damage, but it won't nuisance-trip on moderate motor inrush or transformer charging currents. Rated 480 VAC and 250 VDC with a 50 kA interrupting capacity on both AC and DC sides, this breaker handles high-fault scenarios like industrial feeder panels or UPS output circuits where standard 10 kA MCBs would weld their contacts shut. Mounts on standard DIN rail — drops into any 35 mm rail panel without adapters.

Sourcing and lifecycle — still a current-production part

Availability and current pricing confirmed at quote time against an RFQ through independent distribution channels.

Frequently asked questions

What are the key ratings for S802S-UCB125?

125 A, Trip Curve B, 2 poles, 480 VAC / 250 VDC, 50 kA interrupting capacity on both AC and DC, DIN rail mount.

What is the closest functional second-source to S802S-UCB125 — S202M-B10?

No — the S202M-B10 is a 10 A, 277 VAC / 125 VDC, 6 kA AC / 10 kA DC breaker. The S802S-UCB125 has 12.5× the ampacity and 8× the interrupt rating; they are not cross-compatible.

Will S802S-UCB125 drop into a panel specified around S202M-B10 without rewiring?

Both mount on DIN rail, but the 125 A S802S-UCB125 requires much larger conductors and a higher-rated busbar than the 10 A S202M-B10 — the panel would need rewiring for ampacity.

How do I get current pricing and availability for S802S-UCB125?

Submit an RFQ — availability and current pricing are confirmed at quote time through independent distribution channels.

MPN
S802S-UCB125