Mv Vacuum Fuse Load Break Switch 11kv

The mv vacuum fuse load break switch 11kv is a three phase medium voltage switchgear with a rated voltage of 12 kV and a rated frequency of 50 Hz. It is designed for making and breaking load currents, loop currents, no load transformer currents, and cable charging currents, as well as for closing short circuit currents. When equipped with an earthing switch, the load break switch is capable of withstanding short circuit currents. The structural feature can be show as the below:

1. The load break switch, earthing switch, fuse, and operating mechanism are mounted on a single frame, allowing flexible combinations. The design is compact, with small overall dimensions and easy installation.

2. Equipped with insulated shields for the fixed contacts, the ring main unit achieves internal isolation without the demand for phase to phase barriers or insulating partitions at the breaking points, which effectively prevents arc flash accidents inside the cabinet.

3. A reliable mechanical interlock is provided between the mv vacuum fuse load break switch, earthing switch, and fuse, to ensure compliance with the “five prevention” safety requirements.

4. Two operation modes are available on a mv vacuum fuse load break switch: manual operation and motorized operation with dual AC/DC power supply.

Product Parameter:

Product FAQ:

Q: How does the vacuum technology enhance performance on a mv vacuum fuse load break switch 11kv?

A: The vacuum interrupter provides a clean, reliable arc quenching medium. It ensures fast arc extinction at current zero, reduces contact wear, minimizes maintenance requirements, and eliminates the environmental concerns associated with SF₆ gas.

Q: What role do the fuses play in the load break switch and fuse combination?

A: The fuses act as backup protection, interrupting high fault currents beyond the capacity of the load break switch. They also operate a striker mechanism that trips the switch open during a fault, ensuring coordinated disconnection of the circuit.

Q: What are the advantages over a conventional circuit breaker?

A: While circuit breakers offer full fault clearing capability, the vacuum fuse load break switch provides a more compact, cost effective, and maintenance friendly solution for distribution level applications. It is particularly suited for transformer protection where fuse and switch coordination is sufficient.