CHINT · Moulded case circuit breaker
Product overview
The CHINT NM1-1250H/3300 is a three-pole moulded case circuit breaker rated 1250A for low-voltage power distribution. It provides overload and short-circuit protection with direct handle operation. The H version shown has an ultimate short-circuit breaking capacity of 85kA at 400V AC and 25kA at 690V AC.
Technical selection summary
| Exact model | NM1-1250H/3300 |
|---|---|
| Poles / rated current | 3P / 1250A |
| Frame / breaking-capacity class | 1250 / H |
| Rated operational voltage Ue | AC 690V; 50Hz |
| Rated insulation voltage Ui | 800V |
| Rated impulse withstand voltage Uimp | 8kV |
| Ultimate short-circuit breaking capacity Icu | 85kA at AC 400V; 25kA at AC 690V |
| Service short-circuit breaking capacity Ics | 50% of Icu: 42.5kA at AC 400V; 12.5kA at AC 690V |
| Instantaneous release setting Ii | 10 × In |
| Utilization category / reference temperature | Category A / +40°C |
| Standard marking | GB 14048.2 |
| Operation / mounting | Direct handle operation; fixed mounting |
For a focused quotation, specify NM1-1250H/3300, 1250A, the system voltage and the required accessories. Coordinate the breaker with the prospective short-circuit current and installation requirements.
Typical applications
- Industrial low-voltage distribution boards
- High-current feeder protection
- Panel replacement requiring the NM1-1250H/3300 configuration
Specify your enquiry
For a focused quotation, include:
- NM1-1250H/3300, 3P, 1250A and quantity
- System voltage and prospective short-circuit current
- Connection, operating mechanism and accessory requirements
Download CHINT NM1 English series catalogue (PDF)
Product reference images and drawings
