Compact & High-Performance DC Protection – Features a small size, high breaking capacity, short flashover, and anti-vibration, making it ideal for land and marine applications.
Wide Voltage Range up to 1000V DC – Supports power distribution networks with DC voltages up to 1000V and currents up to 1250A, ensuring robust circuit protection.
Reliable Overload & Fault Protection – Safeguards against overload, short circuit, and undervoltage, while allowing infrequent motor starts and line switching.
Flexible Vertical/Horizontal Installation – Can be mounted in any orientation, providing adaptability for space-constrained electrical panels.
Compliant with GB14048.2 Standard – Meets China’s stringent safety requirements for low-voltage switchgear, ensuring reliability in demanding environments.
Premium Features for Solar Energy Systems
Ultra High Voltage Protection - Designed for PV systems up to 1200V DC
Massive Current Capacity - Supports up to 1250A for large-scale solar installations
Triple Protection - Integrated overload, short circuit, and undervoltage protection
Marine-Grade Durability - Vibration-resistant construction for land and shipboard use
Smart Grid Ready - Compatible with prepaid meter systems and remote monitoring
Technical Specifications
| Core Electrical Parameters | |
|---|---|
| Rated Voltage Range | 250V, 500V, 750V, 1000V, 1200V DC |
| Current Ratings | 63A to 1250A (23 standard variants) |
| Breaking Capacity Levels |
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| Mechanical Endurance | 2,500 operations minimum |
| Electrical Life | 800 operations at rated current |
| Impulse Withstand | 8kV protection against voltage spikes |
| Compliance Standards | GB14048.2, IEC60947-2 |
Advanced Protection Features
Thermal-Magnetic Trip System
Precision bimetal strip and electromagnetic mechanism provides reliable overload and short-circuit protection with adjustable trip settings.
Undervoltage Release
Automatic disconnection when voltage drops below 65% of rated value, protecting equipment from low voltage damage.
Prepaid Meter Integration
Special release mechanism works with AC230V/50Hz prepaid systems, enabling smart energy management.
Arc Flash Protection
Advanced arc chute design minimizes flashover distance for safer operation in high voltage DC applications.
Configuration Options
| Pole Options | Voltage Options | Accessories | Mounting |
|---|---|---|---|
| 1P, 2P, 3P, 4P | 250V to 1200V DC |
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Photovoltaic System Applications
Utility-Scale Solar Farms
1250A models for main DC combiner box protection
Commercial Rooftop Arrays
250-630A versions for string combiner boxes
Battery Storage Systems
High-current protection for lithium battery banks
Marine Solar Installations
Vibration-resistant models for shipboard use
Detailed Accessory Options
| Accessory Type | Description | Technical Specs |
|---|---|---|
| MX Shunt Release | Remote tripping capability | AC/DC 24-380V operation |
| OF Auxiliary Contacts | Status indication | 3A, 0.4A@400V AC, 0.15A@220V DC |
| SD Alarm Contacts | Fault signaling | Normally open/closed configuration |
| Electric Operators | Motorized remote control | Available for all current ratings |
Installation Specifications
Mounting Dimensions
Compact design with multiple pole configurations:
1P: 49-54mm height (varies by model)
4P: Standard 103mm height for 1250A
Environmental Ratings
Operating Temperature: -30°C to +70°C
Humidity: ≤95% RH (non-condensing)
Pollution Degree: 2
Altitude: ≤2000m
Complete Ordering Information
| Model Structure | Example | Description |
|---|---|---|
| NQCM12-[Current]-[Breaking Capacity][Poles][Voltage][Options] | NQCM12-250M-2P-DC500V-OF | 250A, M breaking (50kA), 2 pole, 500V DC with auxiliary contact |
Popular Configurations
PV String Protection: NQCM12-63H-1P-DC1000V
Combiner Box Main: NQCM12-630M-2P-DC1000V-MX
Battery Protection: NQCM12-400L-1P-DC250V-SD
Custom configurations available for large volume orders
Certifications and Standards
GB14048.2 compliant
IEC60947-2 certified
CE marked
RoHS compliant