LRM7-63DC 1P MCB DC250V

1. Basic Product Introduction

The 1P PV DC Circuit Breaker is a single-pole DC protective electrical device specially designed for photovoltaic grid-connected systems. It is used for on-off control and safety protection of DC circuits such as PV module strings and combiner boxes, and is a core basic protective component of photovoltaic systems.

Adopting a 1P modular design (18mm module), it can be installed on a 35mm standard DIN rail with convenient assembly. It is widely used in the DC side of distributed and centralized photovoltaic power stations, suitable for various power PV modules.

2. Product Overview

Different from ordinary AC 1P circuit breakers, it is specially designed for photovoltaic DC systems (high voltage, unidirectional current, easy arcing), with a rated voltage of DC 250V and current of 1A~63A, which can be selected on demand.

Compliant with GB/T 14048.11 and IEC 60947 standards, it has excellent DC arc extinguishing, anti-aging and temperature resistance (-40℃~85℃), adapting to outdoor working conditions and avoiding photovoltaic equipment damage caused by faults.

Its core advantage is single-pole independent control, which is convenient for maintenance. It also has the characteristics of small size and strong breaking capacity, with good compatibility with combiner boxes and inverters, ensuring stable and safe operation of the DC side of photovoltaic systems.

3. Basic Functions

3.1. Short-Circuit Protection: When a short circuit occurs, the internal electromagnetic release acts instantaneously to cut off the circuit, extinguish DC arcs and prevent fault expansion.

3.2. Overload Protection: When the current exceeds the rated value for a long time, the bimetallic strip deforms due to heat and triggers delayed tripping to avoid line overheating and insulation damage.

3.3. Single-Pole On/Off Control: Manual on-off operation can accurately control a single module string without affecting other circuits during maintenance.

3.4. DC Arc Extinguishing Function: Equipped with a special device to quickly extinguish DC arcs and reduce safety risks.

3.5. Environmental Adaptability: Resistant to high and low temperatures, humidity and ultraviolet rays, adapting to harsh outdoor environments and reducing faults.

3.6. Isolation Function: Can be used as an isolating switch to cut off power during maintenance, ensuring the safety of maintenance personnel.

Product Advantage

Advantages and Features of 1P PV DC Circuit Breaker

The 1-pole PV DC circuit breaker is a dedicated protective component for photovoltaic DC systems, adapting to power station operating conditions and ensuring stable and efficient operation of the DC side.

I. Core Advantages

1. Professional Adaptability: Specifically designed for PV DC systems, solving the DC arc-extinguishing problem of ordinary circuit breakers, and adapting to high-voltage and unidirectional current characteristics.

2. Single-Pole Control: Adopting a single-pole modular design, it can independently control a single string of PV modules, facilitating maintenance without affecting other circuits.

3. Excellent Protection: Compliant with GB/T 14048.11 and IEC 60947 standards, with stable short-circuit and overload protection and strong breaking capacity.

4. Environmental Adaptability: Resistant to high and low temperatures (-40℃~85℃), moisture and UV rays, suitable for harsh outdoor PV working conditions with low failure rate.

II. Product Features

1. Compact and Easy to Install: 18mm standard module, compatible with 35mm DIN rails, small in size, easy to assemble and save installation space.

2. Strong Compatibility: Compatible with combiner boxes, inverters and other PV equipment, supporting current 1A~63A and DC 250V selection.

3. Safe and Durable: Equipped with DC arc-extinguishing device, usable as an isolating switch; high-quality materials for anti-aging, low maintenance cost.

Full Technical Specifications

Product Uses

The 1P PV DC circuit breaker is mainly used on the DC side of PV systems, focusing on single-module string protection and control, suitable for various PV stations.

I. Main Application Scenarios

1. Distributed PV Systems: For residential/industrial/commercial rooftop stations, protecting single module strings and facilitating maintenance without affecting overall power generation.

2. Centralized PV Power Stations: Used on the DC side, matching combiner boxes to protect each module string and prevent fault expansion.

3. PV Energy Storage Systems: Protects the loop between PV modules and storage batteries, adapting to high-voltage DC environments.

4. Off-Grid PV Systems: Suitable for rural/remote areas, controlling single strings to ensure stable power supply and easy maintenance.

II. Typical Matching Scenarios

1. PV Module String Protection: Series-connected to provide short-circuit/overload protection and independent on-off control for maintenance.

2. Combiner Box Matching: Installed in combiner boxes as branch switches to enhance DC collection loop safety.

3. Inverter Front-End Protection: Protects inverters from DC side faults (e.g., short circuits) of module strings.

Product Operate Guide

1P PV DC circuit breaker is used for single-path PV string protection and control.

1. Preparation Before Use

1.1. Check parameters: Ensure rated voltage (DC 250V) and current (1A~63A) match the PV system.

1.2. Safety inspection: No damage to the circuit breaker; terminals are tight.

2. Operation Steps

2.1. Closing: Wear insulating gloves, push the handle to "ON" position to connect the circuit.

2.2. Opening: Pull the handle to "OFF" position; reset first if tripped due to faults.

3. Maintenance & Notes

3.1. Regular inspection: Check terminals and handle monthly.

3.2. Professional operation only; do not force closing with faults.

FAQ

1. What is the 1P PV DC circuit breaker used for?

It is used for protection and control of single-path PV module strings on the DC side of PV systems.

2. What rated parameters should I check before use?

Confirm rated voltage (DC 250V~1500V) and current (1A~63A) match the PV system.

3. How to perform closing and opening operations?

Closing: Wear insulating gloves and push the handle to "ON". Opening: Pull to "OFF"; reset first if tripped by faults.

4. What regular maintenance is required?

Check terminals and handle flexibility monthly.

5. What are the key safety notes?

Professional operation only; do not force closing when faults exist.