The ABB S202MUC-K63 is a 2-pole miniature circuit breaker from the S200MUC series, rated at 63 A with a Trip Curve K characteristic. The K curve means the magnetic trip operates between 10× and 14× In (630 A to 882 A peak), which is deliberately set above the inrush of transformers, solenoid valves, and motor starters so the breaker holds through the start transient and only clears a hard fault. On a 277 VAC line-to-neutral or a 500 VDC battery string, the interrupting capacity is 6 kA AC and 10 kA DC respectively — that's the fault current the breaker can safely extinguish without welding contacts or rupturing the housing. The 2-pole configuration lets it switch both phase and neutral on a split-phase circuit, or both poles in a DC system where polarity isolation matters.
ABB S202MUC-K63 S200MUC 2P K 63 A MCB, DIN Rail
ABB S200MUC series, MCB, 2-pole, 63 A, Trip Curve K, 277 VAC / 500 VDC, 6 kA AC / 10 kA DC interrupting capacity, DIN-rail mount.
Specifications
| Parameter | Value |
|---|---|
| Amps | 63 |
| Type | Trip Curve K |
| Poles | 2 |
| Mounting | DIN Rail |
| Volts AC | 277 |
| Volts DC | 500 |
| Breaking capacity | 6 kA |
| Interrupt rating DC | 10 kA |
Product details
Frequently asked questions
What is the S202MUC-K63's interrupting capacity?
6 kA at 277 VAC and 10 kA at 500 VDC. The AC rating is suitable for most commercial and industrial distribution panels where the prospective fault current stays under 6 kA; the DC rating covers battery banks and solar combiner boxes up to 500 V.
Will the S202MUC-K63 drop into a panel built for the S202M-B10?
Mechanically yes — both are 2-pole DIN-rail breakers with the same 36 mm module width and terminal layout. Electrically no: the K curve on this part trips magnetically at 10–14× In, while the B curve on the S202M-B10 trips at 3–5× In. If the panel's wiring and load are sized for 10 A on a B curve, dropping in a 63 A K curve will not provide the same fault protection and may not coordinate with downstream devices. The physical swap is possible; the protection scheme is not equivalent.
Where can I buy the S202MUC-K63?
Sourced and quoted to order against an RFQ through independent industrial-automation distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead-time commitment.