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The Live DCM250C Double Pole DC MCB is a heavy-duty specialized direct current miniature circuit breaker engineered to provide reliable protection for maximum-power DC electrical circuits in utility-scale solar photovoltaic systems, massive battery storage applications, and heavy industrial DC power distribution networks. Rated at 50 Amps with a C-curve tripping characteristic, this 2-pole breaker safeguards both positive and negative conductors on DC systems up to appropriate voltage ratings. It features a 6kA breaking capacity suitable for the most demanding DC installations. The C-curve characteristic (5-10x In) provides excellent protection for DC circuits while accommodating the characteristics of high-power DC sources. With its robust construction and precision thermo-magnetic release, the DCM250C ensures equipment protection and operational safety for the most demanding renewable energy and heavy industrial DC applications requiring maximum current capacity within the DCM series.
Specialized DC Protection: Engineered specifically for direct current applications, ensuring reliable arc extinction and protection in DC circuits.
Double Pole Switching: Simultaneously protects and switches both positive and negative conductors, ensuring complete circuit isolation during fault conditions.
6kA DC Breaking Capacity: Reliable fault current interruption for the most demanding DC installations including utility-scale solar PV and massive battery systems.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (250A to 500A), specifically calibrated for DC circuits with moderate inrush characteristics.
Maximum-Capacity 50A DC Protection: Ideal for utility-scale solar PV combiner boxes, massive battery banks, large DC motor circuits, and heavy industrial DC power distribution.
Utility-Scale Focus: Perfect for megawatt-scale solar farms, massive battery energy storage systems (BESS), industrial DC distribution boards, and heavy manufacturing DC power supplies.
Precision Thermo-Magnetic Release: Thermal bimetal strip for accurate overload protection and magnetic solenoid for instantaneous short-circuit response on both poles.
Superior Arc Extinction: Specialized DC arc quenching technology ensures safe interruption of direct current without sustained arcing.
Extended Operational Life: 8,000 electrical operations for long-term reliability.
Professional Installation: Standard 35mm DIN-rail mounting with IP20 finger-safe terminals.
| Specification | Details |
|---|---|
| Brand | Live |
| Series | DCM |
| Model Number | DCM250C |
| Device Type | DC Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Positive + Negative |
| Current Rating (In) | 50 Amperes |
| Trip Curve Type | C Curve (5-10 × In) |
| Rated Voltage | DC (consult rating chart) |
| Rated Breaking Capacity | 6kA (6000 Amps) DC |
| Insulation Rating (Ui) | 500 Volts |
| Impulse Withstand (Uimp) | 4000 Volts (1.2/50 µs) |
| Dielectric Test Voltage | 2kV for 60 seconds |
| Protection Mechanism | Thermo-magnetic (both poles) |
| Operating Temperature | -5°C to +40°C (daily average ≤35°C) |
| Calibration Reference | 30°C |
| Storage Temperature | -25°C to +70°C |
| Electrical Lifespan | 8,000 cycles |
| Protection Class | IP20 |
| Terminal Capacity | 16mm² (25-35mm² requires external termination) |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 (DC applications) |
1. What are the primary utility-scale applications for the DCM250C 50A DC MCB?
Megawatt-scale solar farm combiner boxes, massive battery energy storage systems (BESS), utility-scale DC power distribution, large electrolysis plants, data center main DC feeds, and heavy industrial DC motor controls.
2. How does 50A DC protection benefit utility-scale solar installations?
Ideal for protecting large combiner boxes aggregating multiple solar strings, typically supporting systems up to approximately 1200-1500W per circuit at standard DC voltages, essential for megawatt-scale solar farms.
3. What is the advantage of 50A rating over 40A for utility-scale DC systems?
Provides 25% additional capacity for the largest-scale applications, essential for massive solar farms, utility-scale battery banks, or systems where 40A circuits would be at their absolute limits.
4. Why is 50A the maximum recommended rating for DC MCBs with 16mm² terminals?
At 50A, 16mm² cable is at its ampacity limit. For 50A continuous DC circuits, 16mm² is the minimum acceptable size. Higher currents would require larger cables and external termination arrangements.
5. What cable size is mandatory for 50A DC utility-scale circuits?
16mm² copper conductor MINIMUM - this matches the maximum terminal capacity. For runs over 15m or high ambient temperatures, external termination with 25mm² or 35mm² is required. Both positive and negative conductors must be identical size.
