DC power systems are widely adopted in solar power generation, energy storage, smart homes, communication base stations and microgrid projects. Different DC circuit structures have distinct current transmission characteristics and fault risks, which directly determine the selection standards of Dc Breaker and protection devices. For electrical installers and project designers, distinguishing different DC circuit types is the premise of completing safe and standardized power distribution design.
Every electrical circuit can be classified into three groups – series, series-parallel and parallel. Thus, DC circuits can be divided into three categories: series DC circuit, series and parallel DC circuit, and parallel DC circuit.
Each type of DC circuit faces unique safety hazards during operation. Series DC circuits feature a single current loop; once a short circuit or overload fault occurs, the entire circuit will fail, requiring sensitive and rapid tripping protection. Parallel DC circuits have multiple branch loops with complex current shunting, which is prone to local overcurrent and hidden fault points. Series-parallel composite DC circuits combine the structural characteristics of the first two types, with more complex fault conditions and higher requirements for the stability and compatibility of protective devices. Therefore, universal and high-performance Dc Circuit Breakers For Solar must be configured for all three types of DC circuits to eliminate potential safety risks.
Zhejiang C&J Electrical co., ltd. (referred to as C&J Electrical) launches the CJM2-63 series professional Dc Mcb, which is fully adapted to series, parallel and series-parallel DC circuit protection scenarios. Complying with IEC60947-2 and GB/T 14048.2 international and national standards, this Dc Breaker For Solar supports multi-voltage and multi-current specification matching, with compact structure, high breaking capacity and strong expandability, perfectly solving the diversified protection needs of different DC circuit types in new energy and civil low-voltage power distribution systems.
Basic Introduction to Three Types of DC Circuits
To help users better match the correct Dc Breaker for different circuit structures, we analyze the structural characteristics and protection difficulties of the three DC circuits:
- Series DC Circuit: It is a single-loop circuit where electrical components are connected end to end. The current of the whole circuit is consistent, and the voltage is distributed according to the load resistance. The disadvantage is that the circuit has poor stability; any load fault will cause the whole system to power off. It requiresDc Mcb with sensitive overload and short-circuit tripping performance to quickly cut off faults and avoid component burnout.
- Parallel DC Circuit: Multiple loads are connected in parallel at the same voltage node, with independent current branches for each load. The system has high stability, and a single branch fault will not affect the normal operation of other branches. However, branch overcurrent and concentrated short-circuit risks are prominent, requiring Dc Circuit Breakers For Solar with accurate current identification capabilities for targeted branch protection.
- Series-Parallel DC Circuit: A composite structure integrating series and parallel connections, which is the most widely used DC circuit type in actual new energy projects. It has both series loop overall risks and parallel branch local hidden dangers, putting forward higher requirements for the full-scenario adaptability of Dc Breaker For Solar.
C&J Electrical CJM2-63 Dc Mcb Product Overview
CJM2-63 series DC circuit breaker is a universal low-voltage DC protection device developed for the three mainstream types of DC circuits. The product is suitable for low-voltage power distribution systems with a rated voltage up to DC1000V and a rated current of DC63A and below. It covers new energy DC power generation, energy storage power supply systems, customized power systems, digital computer centers, communication systems, smart city municipal facilities, smart homes, transportation supporting power distribution and microgrid scenarios.
This Dc Circuit Breakers For Solar adopts a miniaturized and simplified structural design with high operational reliability. It supports rich functional accessory expansion, including auxiliary contacts, alarm contacts and shunt trip devices. The width of auxiliary and alarm accessories is 9mm, and the width of the shunt trip accessory is 18mm, which can flexibly meet the intelligent monitoring and remote control needs of different DC circuit systems. With diverse pole number and voltage specifications, it can perfectly match the protection requirements of series, parallel and series-parallel DC circuits.
Core Product Advantages & Functional Features
- Full-Circuit Type Adaptation: It can stably protect series, parallel and series-parallel DC circuits, solving the problem of different protective device matching for complex DC circuits.
- Ultra-Wide Specification Coverage: The rated current ranges from 1A to 63A, with complete gear options, adapting to low-current precision circuits and medium-current main loop circuits.
- Multi-Grade Voltage Adaptation: Supports DC250V (1P), DC500V (2P), DC800V (3P), DC1000V (4P) voltage grades, covering mainstream low-voltage DC working conditions.
- Compact & Space-Saving: Single pole width is only 18mm, with a miniaturized structure, which effectively saves the installation space of DC distribution boxes.
- High Fault Breaking Capacity: The rated breaking capacity reaches 6kA, which can quickly and safely cut off short-circuit faults of DC circuits and prevent fault expansion.
- Flexible Accessory Expansion: Equipped with multiple expandable accessories to realize fault alarm, remote tripping and status monitoring functions, adapting to intelligent DC power distribution systems.
- Durable Operation Performance: Has 20,000 times mechanical life and 2000 times electrical life, adapting to long-term continuous operation of DC power systems.
- High Safety Protection: IP20 protection grade effectively prevents dust intrusion and accidental touch, improving on-site operation safety.
Complete Technical Parameters
CJM2-63 series Dc Breaker For Solar has standardized and complete technical indicators, fully compliant with international industry standards:
|
Technical Items
|
Specifications
|
|---|---|
|
Executive Standard
|
GB/T 14048.2, IEC60947-2
|
|
Shell Frame Grade Current
|
63A
|
|
Rated Insulation Voltage (Ui)
|
500V
|
|
Rated Impulse Withstand Voltage (Uimp)
|
4kV
|
|
Rated Current Range
|
1A~63A
|
|
Rated DC Voltage
|
DC250V(1P)/DC500V(2P)/DC800V(3P)/DC1000V(4P)
|
|
Thermo-magnetic Release Characteristic
|
10In±20%
|
|
Pole Number
|
1P/2P/3P/4P
|
|
Single Pole Width
|
18mm
|
|
Rated Breaking Capacity
|
6kA
|
|
Reference Temperature
|
30°C
|
|
Utilization Category
|
A
|
|
Mechanical/Electrical Life
|
20000 / 2000 Cycles
|
|
Protection Degree
|
IP20
|
|
Max Wiring Size
|
25mm²
|
|
Connection Mode
|
Top and Bottom Bidirectional Connection
|
Application Scenarios
Adaptable to all three types of DC circuits, CJM2-63 Dc Mcb is widely used in various low-voltage DC power distribution scenarios:
- New Energy Power Generation & Energy Storage: As a professionalDc Circuit Breakers For Solar, it protects series and parallel DC circuits of solar photovoltaic systems and energy storage power supply systems.
- Communication & Data Center: Suitable for series-parallel composite DC circuits of computer rooms and communication base stations, ensuring stable operation of precision equipment.
- Smart City & Smart Home: Applied in municipal public facilities and smart home low-voltage DC systems, adapting to complex circuit power distribution needs.
- Transportation & Microgrid: Used for transportation supporting power distribution and independent microgrid DC circuits, providing reliable fault protection for off-grid power systems.
Product Services & Supply Advantages
CJM2-63 series Dc Breaker has complete specifications, wide circuit adaptability and high safety performance, which can meet the protection needs of all three mainstream DC circuit structures. The expandable accessory design makes the product more adaptable to intelligent and customized power distribution projects.
C&J Electrical supports OEM/ODM brand customization services to meet personalized product and solution requirements of global customers. We provide multiple specification options and support SKD loose parts delivery. If you have any questions about product selection, circuit matching, parameter adaptation and customized cooperation, please feel free to contact us for professional technical support.
Contact Us
In summary, different types of DC circuits have distinct structural characteristics and protection requirements. The universal CJM2-63 Dc Breaker For Solar can perfectly adapt to series, parallel and series-parallel DC circuits, providing stable and reliable safety protection for global low-voltage DC power distribution systems.
Welcome global customers to consult, purchase and customize products. C&J Electrical will provide full-cycle professional after-sales service and technical support.
Post time: Jul-28-2026