The CDV2s-32 Series Motor Start Protector (full name: CDV2s Motor Circuit Breaker) from Delixi Electric is an intelligent protection device specifically designed for three-phase AC motors. It integrates the functions of a circuit breaker and a thermal overload relay, and can directly replace the traditional “circuit breaker + thermal relay” combination solution. It is suitable for various motor control scenarios in industrial, commercial and other fields. The following is its core information:
- Core Functions and Technical Parameters
- Protection Capabilities
Full-scenario Protection: Supports multiple protection functions such as short circuit, overload, phase failure and undervoltage, with precise operation realized through the built-in intelligent release.
Phase Failure Protection Characteristics: When the load of any two phases is unbalanced (e.g., phase failure), it will operate within 2 hours under 1.15 times the rated current, effectively preventing the motor from being burned due to phase loss.
Short-circuit Breaking Capacity: The minimum breaking capacity is 10kA, and the maximum can reach 100kA (depending on the specific model), which can handle high short-circuit current scenarios.
- Electrical Parameters
Rated Voltage: AC 50/60Hz, with a maximum support of 690V (covering common industrial voltages such as 380V and 400V).
Setting Current Range: 0.1-32A, providing 15 subdivided specifications (e.g., 0.1-0.16A, 24-32A, etc.), suitable for motors ranging from 0.06kW to 22kW.
AC-3 Application Category: It can directly control the start and stop of the motor, and is suitable for occasions with infrequent operations (e.g., ≤120 times per hour); for frequent operations, it is recommended to use it with a contactor.
- Certifications and Standards
It has obtained international certifications such as CCC, CE, SEMKO and CB, and complies with the standards of IEC 60947-4-1 (Low-voltage Switchgear) and GB/T 14048.4 (Motor Protection Circuit Breakers).
- Design and Installation
- Compact Structure
With a width of only 45mm, it can be directly installed on a 35mm standard guide rail, saving space in the distribution box.
The modular design supports expansion accessories, such as auxiliary contacts (front-mounted/side-mounted), undervoltage releases, shunt releases, etc., to meet complex control requirements.
- Convenient Operation
Button-type Control: The start, stop and reset of the motor are realized through the panel buttons, with intuitive operation.
Tool-free Installation: The release and the circuit breaker are connected by a snap-fit design, supporting one-handed quick assembly and disassembly.
Wiring Design: It is equipped with upper and lower double-hole terminal blocks, supporting the connection of multi-strand hard wires or flexible wires, with a maximum wire cross-sectional area of up to 6mm².
III. Application Scenarios
- Direct Motor Driven
It can replace the contactor to directly control the motor under low operating frequency (e.g., fans, water pumps), simplifying the circuit design.
Typical Cases: The 17-23A specification can drive a 15kW motor, and the 24-32A specification can drive a 22kW motor.
- Use with Contactors
For equipment that starts and stops frequently (e.g., conveyors, compressors), it is recommended to be combined with CJX2s series contactors to extend the service life.
Wiring Scheme: The CDV2s serves as the power-side protection, and the contactor is responsible for frequent on-off operations, forming a complete “protection + control” solution.
- Replacement of Imported Solutions
It is compatible with the installation dimensions and functions of similar products such as Schneider GV2-ME and Siemens 3VL, and can be directly replaced to reduce costs.
- Model Selection and Price Reference
- Specification Selection
Select the corresponding setting range according to the rated current of the motor. For example:
For a 1.5kW motor (rated current of approximately 3A), select the 0.63-1A specification;
For a 15kW motor (rated current of approximately 30A), select the 24-32A specification.
If auxiliary contact status feedback is required, models with “1NO + 1NC” or “2NO” auxiliary contacts can be selected.
- Price Range
The price of the basic model (without auxiliary contacts) is approximately 13.96-175.77 RMB, depending on the current specification:
Small current range (e.g., 0.1-0.16A): approximately 14-30 RMB;
Large current range (e.g., 24-32A): approximately 150-176 RMB.
The price of models with auxiliary contacts or waterproof enclosures will increase by 20%-30%.
- Installation and Maintenance Recommendations
- Environmental Requirements
Operating Temperature Range: -5℃ to +40℃, humidity ≤90%RH (no condensation).
Avoid installation in environments with high temperature, strong vibration or strong electromagnetic interference.
- Wiring Precautions
The main circuit wiring must be firm to avoid heat generation caused by poor contact;
For the wiring of auxiliary contacts, the normally open (NO) and normally closed (NC) contacts must be distinguished, and connected according to the control logic.
- Regular Maintenance
Check the wear of the contacts every 6 months, and replace them in time if there is ablation;
Test the tripping characteristics every year to ensure the normal operation of the protection function.
