Panel fit and pole count
Three poles means it switches all three phases in a three-phase distribution panel — standard for motor branch circuits, feeder protection, or main disconnect duty in a 400 VAC panel.

ABB XT1SQ3100AFF000XXX, XT1SQ series, 3-pole molded case circuit breaker, 125 A frame, current lifecycle stage.
| Parameter | Value |
|---|---|
| Poles | 3 |
Three poles means it switches all three phases in a three-phase distribution panel — standard for motor branch circuits, feeder protection, or main disconnect duty in a 400 VAC panel.
The XT1SQ3100AFF000XXX is a 3-pole device, meaning it switches and protects all three phases of a three-phase circuit.
Alternative models and sibling configurations in the same ABB series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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