Application of air switches (circuit breakers).
Delixi air switch, also known as circuit breaker. It is a switch that actively closes as soon as the current in the circuit exceeds the additional current. Air switch is a very important electrical appliance in the low-voltage distribution network and electric traction system, which integrates control and multiple maintenance functions. In addition to contacting and breaking circuits, it can also be used to maintain short circuits, severe overloads, and undervoltages in circuits or electrical equipment, and can also be used to start motors infrequently.
The primary internal components contain:
Auxiliary contact: the contact that is mechanically linked with the opening and closing mechanism of the main circuit breaker, which is mainly used to show the opening and closing status of the circuit breaker. It is connected to the control circuit of the circuit breaker, and its related electrical appliances are controlled or interlocked through the opening and closing of the circuit breaker. The electrical appliances in question are manipulated or interlocked.
Alarm Contact: Used as an alarm contact for the circuit breaker incident. The contact will only act when the circuit breaker trips, and is mainly used for free tripping when the circuit breaker is overloaded, short-circuited or under-voltage, and the alarm contact is changed from the original normally open position to the closed position.
Parallel Tripper: A parallel trip is a trip encouraged by a voltage source, the voltage of which is independent of the main circuit voltage. The parallel trip device is an accessory for remote control tripping.
Undervoltage tripper: An undervoltage tripper is a type of tripper that causes the circuit breaker to open with or without delay when the terminal voltage drops to a regular scale.
The primary external components are:
Electric operating mechanism: This is an accessory for remote active flipping and closing circuit breakers. There are two types of electric operating mechanisms: motor operating mechanism and electromagnet operating mechanism.
Joystick: Suitable for molded case circuit breakers. The cover of the circuit breaker is equipped with a mechanism for rotating the operating handle.
Extended handle: It is an external extended handle, which is directly installed on the handle of the circuit breaker. Generally, it is used for manual opening and closing operation of large-capacity circuit breakers of 600A and above.
Handle Determination Device: The handle holder is equipped with a clip that is primarily used to close the circuit breaker.
The principle of an air switch (circuit breaker).
Anatomy of electrical components – air switches (circuit breakers) – the structure, the principle and the wiring diagram.
Classification of air switches (circuit breakers).
According to the number of poles of the air switch, it is divided into: single pole, double pole, triple pole, square installation, etc. The items are as follows
The primary parameter of an air switch (circuit breaker).
Additional Operating Voltage (Ue): The voltage at which the circuit breaker operates under normal (uninterrupted) conditions.
Extra Current (In): The maximum current that the circuit breaker can withstand indefinitely at a regular ambient temperature.
Short-Circuit Trip Current (Im) Setting Value: Short-circuit trip relays (transient or short-delay) are used to quickly trip circuit breakers when high fault current values are presented, and their trip limit is Im.
Additional short-circuit breaking capability (ICU or Icn): The additional short-circuit breaking current of the circuit breaker is the highest (expected) current value at which the circuit breaker can break without being damaged.
Short-circuit breaking ability (Ics): The additional breaking ability of the circuit breaker is divided into additional limit short-circuit breaking ability and additional operating short-circuit breaking ability.
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