CQM5NEZ Series DC Molded Case Circuit Breaker
Product Features
■ Up to DC1500V
Designed for DC systems with rated operational voltage up to DC1500V.
■ Wide Current Range
Rated current from 63A to 630A with 350A and 630A frame sizes.
■ High Breaking Capacity
Breaking capacity up to 30kA at DC1500V for the CQM5NEZ-350 H type.
■ Reliable Circuit
Protection Provides overload and short-circuit protection for DC circuits and power equipment.
■ Flexible Operation
Direct handle operation and optional rotary operating mechanisms are available.
Type designation
| No. | Code | Description |
| ① | CQ | Company Code |
| ② | M | Molded Case Circuit Breaker |
| ③ | 5 | Design Code |
| ④ | NEZ | New Energy – DC |
| ⑤ | 350 / 630 | Frame Size |
| ⑥ | M / H | Breaking Capacity Code: M = Standard Type; H = High Breaking Type |
| ⑦ | 2 | Number of Poles: 2P |
| ⑧ | 2/3 | Release Code: 2 = Magnetic Only; 3 = Thermal-Magnetic |
| ⑨ | □ | Internal Accessory Code: See Accessory Code Reference |
| ⑩ | □ | Operating Mode:Direct handle / Optional rotary handle |
| ⑪ | □ | Rated Current |
| ⑫ | □ | Rated Voltage |
| ⑬ | □ | Accessory Voltage |
Operating Conditions
| Operating Altitude | ≤ 5000 m |
| Storage Temperature | -40℃ to +75℃ |
| Relative Humidity | ≤ 50% at +40℃; up to 90% at +20℃ |
| Pollution Degree | 3 |
| Protection Degree | IP20 |
| Pemasangan | Vertical or horizontal |
| Vertical Installation Inclination | ≤ 5° |
Accessory List
| Code | Accessory |
| 0 | None |
| 10 | Shunt Release |
| 20 | Auxiliary Contact |
| 40 | Shunt Release + Auxiliary Contact |
Technical Specifications
| Parameter | CQM5NEZ-350 | CQM5NEZ-630 |
| Frame Size | 350 | 630 |
| Rated Current In (A) | 63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 280, 315, 320, 350 | 350, 400, 500, 630 |
| Number of Poles | 2P | 2P |
| Rated Operational Voltage Ue | DC1500V | DC1500V |
| Rated Insulation Voltage Ui | 1800V | 1800V |
| Rated Impulse Withstand Voltage Uimp | 12kV | 12kV |
| Breaking Capacity Class | M / H | M |
| Ics = 100% Icu @ DC1500V | M: 20kA / H: 30kA (τ=2ms) | 20kA (τ=2ms) |
| Electrical Endurance | 1,000 cycles | 1,000 cycles |
| Mechanical Endurance | 10,000 cycles | 5,000 cycles |
| Terminal Screw | M8 | M10 |
| Terminal Tightening Torque | 15N·m (±5%) | 25N·m (±5%) |
| Mounting Screw | M4 | M4 |
| Mounting Screw Torque | 1.5N·m (±5%) | 1.5N·m (±5%) |
| Overall Dimensions (L×W×H) | 200 × 83 × 132mm | 205 × 102 × 167mm |
Recommended Conductor Cross-Section
| Rated Current In (A) | 63 | 80 | 100 | 125 | 140/160 | 180/200/225 | 250 | 315 | 320/350 | 400 | 500 | 630 |
| Conductor Cross-Section (mm²) | 16 | 25 | 35 | 50 | 70 | 95 | 120 | 185 | 185 | 240 | 2×50 | 2×95 |
Time-current characteristic curve
Overall and mounting dimensions
CQM5NEZ-350
CQM5NEZ-630
