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Installation must be carried out by a qualified electrician.
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Suitable for indoor use.
The Live DCM220C Double Pole DC MCB is a high-capacity specialized direct current miniature circuit breaker engineered to provide reliable protection for higher-power DC electrical circuits in solar photovoltaic systems, battery storage applications, and various DC power distribution networks. Rated at 20 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 DC installations. The C-curve characteristic (5-10x In) provides excellent protection for DC circuits while accommodating the characteristics of DC power sources. With its robust construction and precision thermo-magnetic release, the DCM220C ensures equipment protection and operational safety for renewable energy and industrial DC applications requiring higher current capacity.
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 standard DC installations including solar PV and battery systems.
C-Curve Characteristic: Trips instantaneously at 5-10 times rated current (100A to 200A), specifically calibrated for DC circuits with moderate inrush characteristics.
High-Capacity 20A DC Protection: Ideal for large solar PV strings, battery banks, DC lighting circuits, and high-power DC distribution.
Renewable Energy Focus: Perfect for solar photovoltaic arrays, battery storage systems, DC distribution boards, and telecom 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 | DCM220C |
| Device Type | DC Miniature Circuit Breaker (MCB) |
| Pole Configuration | 2 Pole (2P) - Switches Positive + Negative |
| Current Rating (In) | 20 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 | Up to 16 mm² |
| Mounting Type | DIN Rail (35mm) |
| Standards | BS IEC/EN 60898 (DC applications) |
1. What are the primary applications for the DCM220C 20A DC MCB?
Large solar PV string protection, commercial battery storage systems, high-power DC lighting circuits, telecommunications power distribution, EV charging stations, and industrial DC power supplies.
2. How does 20A DC protection benefit larger solar installations?
Ideal for protecting solar strings of 8-12 panels (depending on wattage), typically supporting systems up to approximately 500-600W per string at standard DC voltages, suitable for larger residential and commercial arrays.
3. What is the advantage of 20A rating over 16A for DC applications?
Provides 25% more capacity for systems with higher power demands, essential for larger solar arrays, multiple parallel strings, or applications where 16A circuits would operate near their limits.
4. Why is C-Curve important for DC applications with inverters?
C-Curve (5-10x In) handles the inrush from DC-AC inverters and DC-DC converters during startup without nuisance tripping while maintaining full fault protection for the DC side.
5. What cable size is recommended for 20A DC circuits?
2.5mm² copper conductor minimum. 4mm² strongly recommended for longer runs to minimize voltage drop. Both positive and negative conductors must be identical size and type.
