2 Pole PV DC Circuit Breaker 63A 50A 125A 160A 200A 225A 250A MCCB Breaker
Product Details
2 Pole PV DC Circuit Breaker
,250A MCCB Breaker
The NM8NDC Series DC MCCB is a specialized circuit breaker engineered specifically for the demands of Direct Current (DC) power systems. Unlike standard AC breakers, the NM8NDC is optimized for the unique arc-quenching requirements of high-voltage solar PV arrays, battery energy storage systems (BESS), and electric vehicle charging infrastructure.
Rated for currents from 50A up to 250A, this 2-pole breaker provides essential protection against overloads and short-circuits. It is designed to handle the high-energy arcs characteristic of DC circuits, ensuring rapid fault isolation to protect expensive inverters and lithium battery banks. With a compact frame and non-polarized wiring capability (on specific models), it is the premier choice for modern renewable energy installations.
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Optimized DC Arc Extinction: Features a reinforced magnetic blow-out system and a specialized arc-chute design that forces the DC arc away from the contacts, extinguishing it safely and extending the device's electrical life.
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High Breaking Capacity: Engineered to handle high short-circuit currents common in large-scale PV strings, providing a high safety margin for utility-scale and commercial solar projects.
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Non-Polarized Wiring: Flexible installation options allow for bi-directional current flow, making it ideal for battery systems that alternate between charging and discharging states.
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Thermal-Magnetic Trip Unit: Provides reliable protection against low-level overloads (thermal) and instantaneous isolation during massive short-circuits (magnetic).
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Industrial-Grade Durability: Housed in a high-strength, flame-retardant molded case that operates reliably in the high-temperature environments typical of outdoor solar combiner boxes.
| Feature | Detailed Specifications |
|---|---|
| Model Series | NM8NDC (PV DC Optimized) |
| Rated Current (In) | 50A, 100A, 125A, 160A, 200A, 250A |
| Rated Voltage (Ue) | DC 250V / 500V / 750V / 1000V |
| Number of Poles | 2P (2-Pole) |
| Breaking Capacity (Icu) | Up to 100kA (depending on voltage) |
| Insulation Voltage (Ui) | 1000V DC |
| Standard Compliance | IEC 60947-2, CE, TUV |
| Operating Temperature | -25°C to +70°C |
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Solar PV String Protection: Installed in combiner boxes or between the PV array and the inverter to isolate high-voltage DC strings.
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Battery Energy Storage (BESS): Main circuit protection for lithium-ion or lead-acid battery banks in off-grid and hybrid solar systems.
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EV Charging Stations: DC-side protection for rapid chargers, ensuring safe power delivery from the grid to the vehicle.
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DC Microgrids: Reliable power management for industrial DC distribution networks and telecommunication power hubs.
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Silver-Alloy Contacts: Every unit is equipped with high-conductivity silver-alloy contacts to minimize voltage drop and prevent contact welding during heavy-load switching.
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Adjustable Settings: Higher amperage models offer adjustable thermal settings, allowing for precision coordination with the specific current ratings of your solar panels or battery BMS.
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Accessory Support: Compatible with a full range of internal accessories, including Shunt Trips (for remote emergency shutdown), Auxiliary Contacts, and Alarm Switches.
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Safe Isolation: The toggle handle provides clear "ON/OFF/TRIP" status indication, ensuring maintenance crews can verify the circuit status at a glance.
Q: Can I use a standard AC MCCB for my solar DC system?
A: No. DC arcs are much harder to extinguish than AC arcs because they do not have a natural "zero-crossing." Using an AC breaker on a DC system is a fire hazard. The NM8NDC is specifically built to quench DC arcs.
Q: Does it matter which way I connect the positive and negative wires?
A: For the NM8NDC series, many models are non-polarized, meaning they can handle current in both directions. However, always refer to the wiring diagram on the side of the unit for your specific voltage configuration.
Q: What is the recommended maintenance for these breakers?
A: We recommend an annual visual inspection and a manual "trip test" using the push-to-trip button to ensure the internal mechanical linkage remains fluid and responsive.
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Product name
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Low pressure molded case circuit breaker
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Place of origin
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Zhejiang,China
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Q1: Are you trading company or manufacturer?
A1: We are manufacturer.
Q2: Do you have your own R&D team?
A2: Yes, we can customize products as your requirements.
Q3: How about the quality?
A3: We have the best professional engineer and strict QA and QC system.
Q4: Can we be your distributor?
A4: We are looking for distributor and agent all over the world.
Q5: How’s the package?
A5: Normally are wooden case, but also we can pack it according to your requirements.
Q6: How’s the delivery time?
A6: It depends on the quantity you need.
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