The NB1-63DC Pure DC Air Switch is a specialized miniature circuit breaker (MCB) engineered specifically for the demanding environment of Solar Photovoltaic (PV) systems. Standard AC breakers are designed to extinguish arcs at the "zero-crossing" of an AC cycle; however, DC current is continuous, making arcs significantly harder to break.

Our NB1-63DC series features a specialized internal magnetic and cooling structure that forces the DC arc into the extinguishing chamber instantly. Whether you are protecting a residential battery bank or a large-scale commercial solar array, this "Pure DC" breaker ensures your cables, inverters, and modules are protected from catastrophic short-circuit and overload events.

• True Non-Polarity Design: Unlike older DC breakers that require strict "+" and "-" wiring, the NB1-63DC is non-polar. This eliminates the most common cause of installation failure and fire—reverse wiring—making it safer and easier to install in complex combiner boxes.

• Rapid Arc-Extinguishing Technology: Equipped with permanent magnets and 13-plate arc chutes to "stretch" and extinguish high-voltage DC arcs in milliseconds, preventing damage to downstream equipment.

• High-Voltage Capability: Specifically rated for high-voltage DC strings. A 1-pole unit handles 250V, while a 4-pole unit handles up to 1000V DC, meeting the requirements of modern high-efficiency inverters.

• Thermal-Magnetic Trip Mechanism: Provides a dual-layer defense. The thermal element protects against long-term overloads, while the magnetic element provides instantaneous protection against high-current short circuits.

• Environmental Reliability: Built to operate in extreme solar-site conditions, from rooftop heat to freezing temperatures (-35°C to +70°C), housed in a high-strength, flame-retardant VO-rated casing.

1. Solar Combiner Boxes: Merging multiple DC strings safely before entering the inverter.

2. Hybrid Solar Inverters: DC-side circuit protection and manual disconnect for maintenance.

3. DC Battery Storage: Safeguarding lithium or lead-acid battery banks in 12V, 24V, 48V, or high-voltage storage systems.

4. DC EV Chargers: Reliable protection for the DC output stages of electric vehicle charging infrastructure.

• Visual Safety Indicator: Features a dedicated status window (Red/Green) that indicates the actual contact position, providing a mechanical "seeing-is-believing" safety check for technicians.

• Compact Footprint: At only 18mm per pole, it maximizes space in crowded solar distribution boards.

• Industrial Durability: All internal copper components are treated for anti-oxidation, ensuring long-term conductivity even in high-humidity environments.

• Global Compliance: Fully certified under IEC 60947-2, making it suitable for export and use in government-tendered solar projects worldwide.

Q: Can I use this for a 48V Battery system?

A: Absolutely. While it is rated for up to 1000V, it provides excellent protection for low-voltage DC systems like 48V battery banks, offering much higher breaking capacity than standard automotive fuses.

Q: What is the benefit of "Non-Polarity"?

A: Polarized breakers must have the power source connected to a specific terminal. If wired backwards, they can explode during a fault. Non-polar breakers like the NB1-63DC work regardless of which way the current flows, making them foolproof for field installers.

Q: Does it support remote tripping?

A: Yes. The NB1-63DC can be fitted with standard CHINT-style accessories, including shunt trips, auxiliary contacts, and undervoltage releases.