How does the manual Timetric ZW32 vacuum circuit breaker protect the line?

The manually operated Timetric Electric ZW32 vacuum circuit breaker protects power lines through its mechanism, vacuum interrupter and transformer. Let's take a closer look at their working principles and protective functions:

Components and protection principles

1. Mechanism: responsible for the opening and closing actions of the manually operated circuit breaker.

2. Vacuum interrupter: used to quickly extinguish arcs when breaking the circuit to prevent arc continuation.

3. Current transformer: used to detect current and is a key component for protecting the line.

Working principle

Current detection and signal transmission: When the current exceeds the rated value of the transformer, the transformer will generate a corresponding current signal.

Surge controller: After receiving the signal from the transformer, the surge controller will respond and send an action signal.

Trip coil: After receiving the signal from the surge controller, the trip coil will act to make the vacuum circuit breaker perform the trip action.

Protect the line: Through the above steps, when the current exceeds the set value (which may be the rated current or short-circuit current), the vacuum circuit breaker will quickly open, thereby protecting the power line from overload or short circuit.

Why does the vacuum circuit breaker disconnect?

The vacuum circuit breaker will automatically disconnect when the transformer is overloaded or the line is short-circuited. This is because:

Overload protection: When the current carried by the transformer or line exceeds the set value, the current signal detected by the transformer will trigger the action of the vacuum circuit breaker, thereby preventing the equipment or line from being overloaded and damaged.

Short-circuit protection: In the case of a line short circuit, the instantaneous current increases significantly, the transformer immediately detects the abnormal current, and quickly activates the vacuum circuit breaker to cut off the current to prevent further damage.