LRM7-63DC 4P MCB DC1000V

Advantages and Features of 4P DC PV Miniature Circuit Breaker

1. Four-pole simultaneous switching, higher safety level: It can break four DC poles at the same time, suitable for dual-circuit and bipolar systems, realizing complete power-off of positive and negative dual circuits and eliminating residual live risks.

2. Integrated design, saving installation space: One device achieves dual 2P circuit protection, greatly reducing the number of components inside combiner boxes/power distribution cabinets, simplifying wiring and improving space utilization.

3. Professional DC arc extinguishing system: Optimized arc extinguishing structure for the zero-crossing-free characteristic of PV DC, quickly cutting off DC arcs to avoid arc burnout, with stronger reliability.

4. Adapted to high-power PV systems: Supports DC 1000V/1500V high-voltage systems, suitable for centralized and industrial-commercial high-power PV power stations, adapting to multi-string circuit protection.

5. Accurate and stable protection characteristics: Equipped with overload long-delay and short-circuit instantaneous protection, whose operating characteristics match those of PV modules to avoid mis-tripping or failure to trip.

6. Efficient and convenient installation and operation & maintenance: Standard DIN-rail mounting, unified operating handle, centralized multi-circuit management, reducing construction and later maintenance costs.

7. Compliant with international standards: Meets IEC/EN 60947-2 standards, flame-retardant shell, high and low temperature resistance, anti-aging, stable and reliable long-term operation.

Full Technical Specifications

Product Uses

Specific Application Scenarios of 4P DC PV Miniature Circuit Breaker

1. Large-scale centralized PV power plants**: Used for dual-circuit protection in PV array combiner boxes and inverter DC sides, suitable for 1500V high-voltage systems.

2. Industrial and commercial distributed PV systems**: Integrated protection for high-power string circuits on rooftops, saving cabinet space and simplifying wiring.

3. PV and energy storage integrated systems**: Protect dual DC circuits on PV and energy storage sides, realizing centralized DC switching and safe isolation.

4. Bipolar/dual-circuit PV distribution devices**: Suitable for DC distribution scenarios requiring simultaneous control of two sets of positive and negative poles.

5. Building-integrated photovoltaics (BIPV) and large industrial-commercial rooftops**: Multi-circuit centralized protection, improving system safety and integration.

Product Operate Guide

How to Use 4P DC PV Miniature Circuit Breaker

1.Pre-installation Inspection**

Confirm that the rated voltage (DC1000V/1500V), current and polarity match the PV dual-circuit system. Check that the appearance is intact and the handle operates flexibly.

2.Standard Wiring

Connect the four poles to the positive and negative poles of two DC circuits respectively in strict accordance with the polarity marked on the product. Fasten the terminals firmly to avoid loose connection and overheating.

3.DIN-rail Installation

Install on a standard DIN rail, reserve sufficient heat dissipation space, and ensure stable fixation.

4. Closing Operation

After confirming that there are no faults in the circuit and no personnel working, push the handle to the "ON" position to put the dual circuits into operation.

5.Tripping and Resetting

The circuit breaker will trip automatically in case of overload or short circuit. First eliminate the fault, toggle the handle to "OFF", then push it back to "ON" to reset. Forced closing from the middle position is strictly prohibited.

6.Routine Maintenance

Regularly check the tightness and temperature of the terminals, keep the equipment clean, and forbid forced closing under fault conditions.

4P DC PV Miniature Circuit Breaker FAQ

1. Q: What is the core difference between a 4P DC PV breaker and a 2P one?

A: A 4P breaker controls four poles, realizing dual 2P circuits in one unit, suitable for dual-string or bipolar PV systems. A 2P breaker only protects one positive-negative circuit, mainly for single-loop scenarios.

2. Q: Can the 4P DC breaker be used for AC distribution?

A: No. DC and AC arc-extinguishing principles are completely different. Using a DC breaker in an AC circuit will cause failure to extinguish arcs, equipment burnout, or fire risks.

3. Q: Why does the 4P breaker trip frequently?

A: Common causes include dual-circuit overload, short circuit, reversed polarity, component or cable faults, or inappropriate rated current selection.

4. Q: How to correctly reset after tripping?

A: First turn the handle to OFF, then push it to ON. Never force closing from the middle trip position.

5. Q: What voltage levels are applicable for 4P DC PV breakers?

A: They are mainly designed for DC 1000V and 1500V high-voltage PV systems, widely used in large-scale and industrial-commercial PV stations.

6. Q: Can one 4P breaker replace two 2P breakers?

A: Yes. It integrates dual 2P protection, saving installation space, simplifying wiring, and reducing cabinet size, which is ideal for combiner boxes and integrated distribution devices.