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The NM8N - HV Series Molded Case Circuit Breaker is designed for high-voltage application scenarios. It operates efficiently in making and breaking electrical circuits, offering reliable protection under critical operational conditions.
Engineered for AC 50Hz/60Hz electrical systems with a maximum voltage of 1150V and a maximum rated current of 630A. It provides overload, short-circuit, and undervoltage protection, including short-circuit protection for infrequent motor starting.
Features a standard 3-pole configuration with choice of thermal-magnetic (TM) and magnetic (M) release units for flexible protective coordination.
| Specification Category | Details |
|---|---|
| Basic Model Information |
Model: NM8N-630HV Type: Molded Case Circuit Breaker (MCCB) Series: NM8N-HV (High-Voltage Rated) |
| Rated Current (In) |
Frame size: 630A Rated current options: 400A, 500A, 630A |
| Voltage Ratings |
- Rated insulation voltage (Ui): 1250V AC - Rated operating voltage (Ue): 690V / 800V / 1000V / 1150V AC (50/60Hz) - Rated impulse withstand voltage (Uimp): 12kV |
| Breaking Capacity |
- Rated ultimate short-circuit breaking capacity (Icu): 36kA (C-type) / 50kA (S-type) @ 800V AC - Rated service short-circuit breaking capacity (Ics): 21.6kA (C-type) / 30kA (S-type) @ 800V AC (60% of Icu) - Short-time withstand current (Icw): 36kA/1s (C-type) / 50kA/1s (S-type) |
| Pole Configuration | 3-pole |
| Tripping System |
- Thermal-Magnetic (TM): For overload (long-time) and short-circuit (instantaneous) protection - Magnetic (M): For short-circuit (instantaneous) protection only Note: No electronic trip unit option for this model |
| Operating Mechanism |
Manual operation (rotary handle) Optional: Electrical closing/opening coil (for remote control) |
| Mounting Type | Fixed mounting (flush or surface mount) |
| Standards & Certifications |
- Compliance: IEC/EN 60947-2 - Certifications: CCC, CE, RoHS |
| Dimensions & Weight |
Approximately 210mm × 360mm × 180mm (varies slightly by trip unit type) Weight: Approximately 12kg - 15kg (depending on configuration) |
| Environmental Ratings |
- Operating temperature: -40°C ~ +70°C - Storage temperature: -40°C ~ +85°C - Relative humidity: ≤95% RH (non-condensing) - Altitude: ≤2000m (derating required above 1000m) - IP Rating: IP20 (terminal area) |
| Accessories (Optional) |
- Auxiliary contacts (NO/NC: 1NO+1NC, 2NO+2NC) - Shunt trip (ST) - Undervoltage release (UVR) - Rotary handle extension - Locking device (to prevent accidental operation) |
| Key Features |
- High insulation voltage for medium-high voltage low-power systems - Robust molded case (flame-retardant UL94 V0 grade) - Reliable arc-quenching system for safe fault interruption - Wide temperature range for harsh environments - Compact design for space-constrained installations |
Delivery information typically includes structured packaging, selected shipping methods, and varying delivery times depending on order placement, requirements, and purchase locations.
