Chint NM8N
Moulded Case Circuit Breaker
Zero arcing distance circuit breaker engineered for operational voltages up to AC 690V and DC 1000V.
Product Overview
The Chint NM8N series moulded case circuit breaker provides circuit protection across a rated operational current range from 16A to 1600A. Built to standard IEC/EN 60947-2, it operates at 50/60Hz up to AC 690V and DC 1000V. Featuring six frame sizes, 0 mm arcing distance, and IP40 protection, the NM8N supports vertical or horizontal installation with top and bottom line entry configurations.
Technical Parameters
| Standard | IEC/EN 60947-2 |
| Rated Operational Current Range | 16A to 1600A |
| Rated Operational Voltage (AC) | up to AC 690V |
| Rated Frequency | 50/60Hz |
| Number of Poles | 1P, 2P, 3P, 4B, 4C |
| Frame Sizes | 125A, 250A, 400A, 630A, 800A, 1600A |
| Breaking Capacity Codes | B, C, S, Q, H, R |
| Rated Insulation Voltage Ui | 1000 V |
| Rated Operational Voltage (DC) | up to DC 1000V |
| Rated Impulse Withstand Voltage Uimp (Frame 125/250) | 8 kV |
| Operating and Storage Temperature | -40°C~+70°C |
| Operating Altitude | ≤ 2000m |
| Pollution Grade | Grade 3 |
| Degree of Protection (IP Grade) | IP40 |
| Mounting Orientation and Line Entry | Vertical or horizontal installation; top and bottom line entry |
| Arcing Distance | 0 mm |
| Mechanical Life (Frame 125/250) | 25000 CO cycles |
| Rated control coil voltage options | 415V, 440V, 500V, 690V |
| Brand | Chint |
| Model | NM8N |
| Product type | Moulded Case Circuit Breaker |
| Applicable standard | IEC/EN 60947-2 |
Key Selling Points
✓ Broad operational current coverage from 16A to 1600A across six frame sizes from 125A to 1600A.
✓ Dual AC and DC capability operating at rated voltages up to AC 690V at 50/60Hz and DC systems up to DC 1000V.
✓ Zero arcing distance design enables compact installation within switchboards and distribution panels.
✓ Multiple pole configurations including 1P, 2P, 3P, 4B without N-pole protection, and 4C with N-pole protection.
✓ Flexible installation supporting vertical or horizontal mounting as well as top and bottom line entry.
✓ High insulation and impulse ratings with 1000 V rated insulation voltage Ui and 8 kV impulse withstand voltage Uimp.
✓ Durable design featuring 25000 CO mechanical cycles for frame 125/250 and an operating temperature range of -40°C to +70°C.
Technical Highlights
- Rated operational current range: 16A to 1600A across six frame sizes
- Rated operational voltage: up to AC 690V (50/60Hz) and DC systems up to DC 1000V
- Rated insulation voltage Ui: 1000 V; impulse withstand voltage Uimp: 8 kV (Frame 125/250)
- Arcing distance: 0 mm
- Mechanical life: 25000 CO cycles for Frame 125/250
- Operating and storage temperature: -40°C to +70°C; altitude: ≤ 2000m
- Degree of protection: IP40; pollution grade: Grade 3
- Control coil voltage options: 415V, 440V, 500V, 690V
Selection Guide
Select required frame size (125A, 250A, 400A, 630A, 800A, or 1600A), breaking capacity code (B, C, S, Q, H, or R), and pole configuration (1P, 2P, 3P, 4B with unprotected neutral, or 4C with protected neutral).
Reference Datasheet Pages
The following pages were selected from the model catalogue and are included for technical reference:
NM8N Catalog and Technical Data
