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| Parameter | 3P | 4P |
| Frame size rated current Inm (A) | 400 | 400 |
| Rated current In (A) | 300, 350, 400A | 300, 350, 400A |
| Rated operating voltage Ue (V) DC | DC750V | DC1000V |
| Rated insulation voltage Ui (V) DC | DC1000V | DC1000V |
| Rated impulse withstand voltage Uimp (kV) | 12kV | 12kV |
| Rated ultimate short-circuit breaking capacity Icu (kA) | 20 kA | 20 kA |
| Rated short-time withstand current Ics (kA) | 20 kA | 20 kA |
| Mechanical life (operations) | 10,000 | 10,000 |
| Electrical life (operations) | 2,000 | 1,000 |
| Trip Method | Thermomagnetic | Thermomagnetic |
| Compliant Standards | IEC 60947-2, GB/T 14048.2 | IEC 60947-2, GB/T 14048.2 |
| Degree of protection | IP20 | IP20 |
| Operating temperature | -40°C ~ +70°C | -40°C ~ +70°C |
| Mounting type | Fixed, Withdrawal Type | Fixed, Withdrawal Type |
| Dimensions (L × W × H, mm) | 142×260×110 | 188×260×110 |
| Available accessories | Undervoltage trip, auxiliary contact, alarm contact, shunt trip, motorized operating mechanism, rotary handle | Undervoltage trip, auxiliary contact, alarm contact, shunt trip, motorized operating mechanism, rotary handle |
UKM32PV 400A 3P 750V DC MCCB for PV System Molded Case Circuit Breaker
UKM32-400PV DC Molded Case Circuit Breaker is designed for photovoltaic power generation and distribution systems, supporting rated currents up to 400A and DC rated voltages as high as DC1000V. This circuit breaker provides overload long-time delay and short-circuit instantaneous protection, ensuring reliable safety for PV distribution networks, lines, and electrical equipment against overload, short-circuit, and other electrical faults. The breaking capacity of the UKM32-400PV DC Molded Case Circuit Breaker is available in two types: Type N with 20kA and Type H with 50kA. With a use category of A, it is widely suitable for application in combiner boxes, DC control panels, inverters, energy storage systems, and other critical PV and energy management equipment.
Free Quote NowKey Features
- Supports 750V / 1000V DC systems
- Breaking capacity — up to 20kA
- Multiple rated currents: 300, 350, 400A
- Wide operating temperature: -40°C to +70°C
- Long service life: Mechanical life up to 10,000 operations
- IP20 protection for enhanced safety
- Supports various accessories: undervoltage trip, auxiliary contact, alarm contact, shunt trip, motorized operating mechanism, rotary handle
- Fixed mounting design for easy installation
Applications
- Photovoltaic DC combiner box protection
- Energy storage battery pack protection
- DC distribution boards and telecom power systems
- Industrial DC control systems
- EV charging facilities
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