Products Description

VTZ locking electromagnet is a key component of the anti-misoperation system of vacuum circuit breakers. It is an electromagnetic drive device designed to work together with the mechanical and electrical interlocking system of the circuit breaker. Under specific operating conditions, it generates electromagnetic force to control the locking mechanism, thereby restricting improper operations and improving the safety and reliability of the switchgear. Its core functions include:

1. Restricted operating conditions:
When the circuit breaker is not energy-stored, not fully in position, or when an abnormal or fault condition exists in the system, the locking coil generates electromagnetic force to activate the locking mechanism and prevent unauthorized opening or closing operations. This effectively avoids dangerous operations such as accidental closing, improper switching, or operating the circuit breaker under an unsuitable load condition, helping ensure the safe operation of the electrical system.

2. Circuit control:
After the circuit breaker completes the closing operation, the closing control circuit is automatically disconnected to prevent the closing coil from remaining energized for an extended period. This helps avoid repeated closing actions or abnormal operations caused by incorrect or unstable control signals, while reducing unnecessary electrical and mechanical stress on the operating mechanism and improving the reliability and service life of the circuit breaker.

3. Interlocking realization:
The locking electromagnet can be linked with the circuit breaker position, energy storage status, cabinet position, and other operating conditions to establish a reliable mechanical and electrical interlocking system. Through coordinated control of these conditions, it helps realize the "five protection" functions of the switchgear, such as preventing accidental entry into an energized compartment, preventing improper operation, and ensuring that the circuit breaker can only be operated when the required safety conditions are satisfied.

Composition and design features:

1) Electromagnet assembly: It consists mainly of an electromagnetic coil, iron core, and related components. When the coil is energized, it generates electromagnetic force to drive the locking iron core, enabling the locking or releasing action of the mechanism. The assembly works together with the circuit breaker's interlocking system to ensure reliable operation and prevent improper switching under specified conditions.

2) Auxiliary contact: It is mainly used to detect and provide feedback on the locking status of the mechanism, while controlling the corresponding circuit to switch on or off. By transmitting the locking status to the control circuit, the auxiliary contact helps ensure that the circuit breaker can only perform the corresponding operation when the required conditions are satisfied, improving the safety and reliability of the overall interlocking system.

Products technical parameter

Voltage(V)	DC 220	DC 110
Wire diameter(mm)	0.05	0.07
Number of turns(N)	31000	16000
Resistance(Ω)	12000±960	4500±360
Sports travel(mm)	7.5～8
Electromagnetic action response time(ms)	≤60
Mechnical life (times )	≥10000
Operating temperature range(℃)	-40～+40
Power frequency withstand voltage/1min	2000V without breakdown and heat generation

Note: Voltage fluctuation range: Reliable operation is allowed within the range of 85% to 110% of the rated voltage.

Scope of application

1. VTZ series indoor integrated vacuum circuit breaker mechanism module;

2. VTZ series indoor split vacuum circuit breaker operating mechanism;

3. Other occasions where modular operating mechanisms are used.

VTZ Locking Electromagnets supplier

High reliability

The circuit breaker cannot be closed when the required conditions are not met, thus avoiding accidents caused by misoperation. This interlocking function effectively prevents improper switching operations and helps ensure the safe and reliable operation of the electrical system. It also reduces the risk of equipment damage and personnel safety hazards caused by incorrect operation.

Fast response

≤60ms response time ensures real-time locking and unlocking of the mechanism, enabling the circuit breaker to respond quickly to changes in operating conditions. This helps prevent improper operations and improves the safety, reliability, and responsiveness of the interlocking system.

Low maintenance

Lubrication-free structure, long maintenance cycle. The specially designed structure reduces the need for regular lubrication and routine maintenance, helping simplify equipment servicing. It also contributes to stable mechanical performance and reliable operation over a long service period, reducing maintenance costs and downtime.