In industrial and commercial electrical systems, electric motors are the core power source for numerous devices and production lines. Once a motor fails, it may lead to production interruptions, equipment damage, and even safety hazards. Therefore, Motor Protection has become an indispensable part of ensuring the stable operation of electrical systems. Zhejiang C&J Electrical co., ltd. (referred to as C&J Electrical) has launched the CJRV series AC motor starter, a professional Motor Protection Circuit Breaker that provides comprehensive protection for motor operation.
The Core Connotation of Motor Protection
Motor protection is used to prevent damage to the electrical motor, such as internal faults in the motor. Also external conditions when connecting to the power grid or during use have to be detected and abnormal conditions must be prevented. Simply put, motor protection is a “safety shield” for electric motors, which monitors the motor’s operating status in real time. When faults such as overload, phase loss, short circuit, or overheating occur, it can quickly take protective measures (such as cutting off the power supply) to avoid further damage to the motor and the entire electrical system.
Compared with ordinary circuit protection, Motor Protection is more targeted. It needs to adapt to the special operating characteristics of motors (such as large starting current, three-phase balance requirements, etc.), so professional Motor Protection Circuit Breakers have become the first choice for motor protection.
What is a Motor Protection Circuit Breaker?
A Motor Protection Circuit Breaker is a specialized electrical component that integrates motor protection and control functions. It not only has the basic protection functions of ordinary circuit breakers (such as short circuit protection), but also is equipped with targeted protection mechanisms for motor faults, such as overload protection, phase loss protection, etc. At the same time, it can also realize infrequent starting control of motors, integrating protection, control, and isolation functions into one.
The core value of a Motor Protection Circuit Breaker lies in its “professionalism” and “integration”: it can accurately identify motor-specific faults, respond quickly, and avoid misprotection caused by the motor’s special starting current; the integrated design simplifies the electrical system layout, reduces installation space and cost, and improves the reliability of the system.
C&J Electrical’s CJRV Series: Core Advantages & Technical Specifications
C&J Electrical’s CJRV series AC motor starter is a high-performance Motor Protection Circuit Breaker, suitable for circuits with AC voltage not exceeding 690V and current not exceeding 80A. It is used for overload, phase loss, short circuit protection, and infrequent starting control of three-phase squirrel-cage asynchronous motors. It can also be used for distribution line protection, infrequent load switching, and as an isolating switch. Its core advantages and technical parameters are as follows:
Core Functions & Advantages
- Comprehensive protection: Integrates overload, phase loss, and short circuit protection, fully covering common motor fault types
- Dual-purpose control: Realizes infrequent starting control of motors and can be used for distribution line protection and load switching
- Isolation function: Can be used as an isolating switch, improving the safety of maintenance and operation
- Wide voltage adaptation: Suitable for multiple AC voltage levels (230/240V, 400/415V, 440V, 500V, 690V), strong versatility
- Standard installation: Compatible with 35mm rail mounting, conforming to mainstream electrical cabinet installation specifications
- High safety performance: Complies with international standards, with reliable performance and stable protection
Detailed Technical Parameters
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Parameter
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Details
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|---|---|
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Rated insulation voltage Ui (V)
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690
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Rated working voltage Ue (V)
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AC 230/240, AC 400/415, AC 440, AC 500, AC 690
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|
Rated frequency (Hz)
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50/60
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|
Rated current of enclosure frame Inm (A)
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25 (CJRV-25, 25X), 32 (CJRV-32, 32X/CJRV-32H), 80 (CJRV-80)
|
|
Rated impulse withstand voltage Uimp (V)
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8000
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|
Selection category & Service category
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A, AC-3
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|
Insulation stripping length (mm)
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10, 15 (CJRV-80)
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|
Cross-sectional area of conductor (mm²)
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1~6, 2.5~25 (CJRV2-80)
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|
Maximum number of clampable conductors
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2, 1 (CJRV-80)
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|
Terminal fastening screw size
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M4, M8 (CJRV-80)
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|
Tightening torque of terminal screws (N·m)
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1.7, 6 (CJRV-80)
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|
Operating frequency (times/hour)
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≤30, ≤25 (CJRV-80)
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Compliance & Certification
- Complies with IEC60947-2 international standard
- Rigorously tested to ensure stable performance in various harsh operating environments
Versatile Application Scenarios
With its comprehensive protection functions and wide adaptability, the CJRV series Motor Protection Circuit Breaker is widely used in various industrial and commercial scenarios, including:
- Industrial production workshops: Protection and control of motors for production equipment (such as conveyors, pumps, fans, compressors)
- Commercial buildings: Protection of HVAC system motors, water pump motors, and ventilation equipment motors
- Infrastructure projects: Motor protection in water treatment plants, power stations, and transportation hub equipment
- Light industrial fields: Small and medium-sized processing factories, assembly lines, and motor-driven equipment in workshops
- Public facilities: Motors in hospitals, schools, shopping malls, and other public places (such as escalator motors, fire pump motors)
Why Choose C&J Electrical’s CJRV Series?
In the field of Motor Protection, the CJRV series Motor Protection Circuit Breaker from C&J Electrical stands out with its obvious advantages:
- Professional protection: Targeted design for three-phase squirrel-cage asynchronous motors, accurate and reliable fault identification
- Multi-function integration: Integrates protection, control, and isolation, simplifying system design and reducing costs
- Strong versatility: Wide voltage and current range coverage, suitable for various motor models and application scenarios
- International standard compliance: Meets IEC60947-2 standard, ensuring product quality and global market adaptability
- Easy installation and maintenance: Standard 35mm rail mounting, convenient for later maintenance and replacement
Get in Touch
If you have any questions about the CJRV series Motor Protection Circuit Breaker, such as product specifications, technical details, customization needs, or bulk orders, please feel free to contact C&J Electrical. Our professional team will provide you with tailored motor protection solutions to ensure the stable and safe operation of your electrical system.
Post time: Dec-22-2025