NC2 · LARGE MOTOR CONTACTOR
NC2 extends motor-control contactor selection into the high-current range.
The source compilation lists NC2 for 50/60 Hz circuits, working voltage to 690 V and working current to 800 A. It can be combined with a suitable thermal overload relay to form an electromagnetic starter.
Verified source data
Use these values as family-level limits, then check the exact NC2 size.
| Item | NC2 source data | Selection note |
|---|---|---|
| Standard | GB/T 14048.4; IEC/EN 60947-4-1 | Check project certification requirements |
| Working voltage | Up to 690 V | Confirm system voltage and utilization category |
| Working current | Up to 800 A | Exact rating depends on model and duty |
| Poles | 3-pole; 4-pole variants shown in model coding | Verify exact configuration |
| Overload coordination | Suitable thermal overload relay; NR2-150 appears with NC2 115/150 in NR2 data | Full coordination required for large motors |
Large-motor checks
High-current contactor replacement needs more than a current match.
- AC-3 current at actual voltage
- Coil voltage and operating frequency
- Mechanical interlock or reversing requirement
- Busbar/terminal dimensions and enclosure clearance
- Short-circuit protection and overload coordination
Source reference
Internal database reference for engineering review.
2026 B11 compilation: NC2 detailed section begins at page 707. B12 overview: page 16.