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| AMPERE | 20A, 32A, 40A, 63A |
|---|
Description
CNC YCB7-63N 4 Pole AC MCB
This 4 pole miniature circuit breaker protects three-phase + neutral circuits against overload and short circuit faults. It is commonly used in three-phase distribution boards for commercial buildings, factories, and agricultural pump feeders across Pakistan.
The YCB7-63N series is DIN-rail mounted and fits standard Pakistani DB enclosures. Each unit covers all four conductors (L1, L2, L3, N) in a single trip mechanism, so a fault on any phase disconnects the entire supply — preventing single-phasing damage to motors and compressors.
Specifications
| Model | YCB7-63N (4P) |
|---|---|
| Poles | 4 Pole (3P+N) |
| Rated Current | 20A, 32A, 40A, 63A |
| Rated Voltage | AC 400V / 50Hz |
| Breaking Capacity | 6kA |
| Trip Curve | C Curve |
| Mounting | 35mm DIN Rail |
| Standard | IEC 60898 |
Typical Applications
- Main breaker for 3-phase DB boards in shops, offices, and small factories
- Motor feeder protection (submersible pumps, compressors up to 63A)
- Generator changeover panel — WAPDA/generator incoming side
- Three-phase solar inverter AC output protection
Installation Note
Wire the neutral through the 4th pole. On a fault, all four poles trip simultaneously. Use 6mm² copper wire for 32A and below; 10mm² for 40A and 63A ratings. Torque terminal screws to 2.5 Nm.

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