What is interlocking in Air Circuit breaker

Question

Accepted Answer

Interlocking in an Air Circuit Breaker is a mechanism that ensures the safe operation of the breaker by preventing certain actions from occurring simultaneously.

Interlocking is a safety feature in air circuit breakers that prevents unsafe conditions.
It ensures that certain actions cannot be performed simultaneously, reducing the risk of accidents.
For example, interlocking can prevent the closing of the breaker if the door of the panel is open.
It can also prevent the opening of the breaker if it is still carrying current.
Interlocking mechanisms can vary depending on the specific design of the air circuit breaker.

Accepted Answer

Machanically interlocked circuit are inteded to prohibit both power sources from being simultaneously connectev to the load

Accepted Answer

Electrical and Mechanical Interlock are used when there two or more source of power supply to a common load. For example a Power Utility Electric supply and a standby Generator power supply. Of course we do not want this two supply to be connected to the load, not unless properly synchronize, as the smaller Power supply will get motorize and eventually be burnt. Usually in the case of smaller size of Standby generator which is being normally protected by a electrical and mechanical interlocking device. Electrical interlocking device like (ACB) Air Circuit or Breaker and Mechanical Interlocking device is a mechanical way, bolt or metal strips, design so as not to switch on the two ACB power supply source at the same time. You can only switch on one breaker at a time. This will avoid the Electrical Fault cause by two power source simultaneously supplying common load. The safest way is to use both Electrical and Mechanical interlock on multi source op power supply. The main purposes for interlocking system are

Automatically ‘Trip’ the switching device while it is carrying over load or fault current
To prevent the switching mechanism from being ‘on’ position during set ‘off’ position.
Opening of access doors or panels before setting the switching device in its ‘off’ position.
To isolated the access by human operators while the system energized.
To avoid easy access to the bus bars when the switching devices in ON position
To prevent earthing switches from being closed on to live circuits or bus bars.
Incorrect electrical operation of a complex process system in which various external devices,motors or pumps are intimately related.
To avoid pump or electrical motor operate or running other than their sequence accidentally.

What is interlocking in Air Circuit breaker

Popular interview questions of Assistant Property Manager

Top HR questions asked in JLL Assistant Property Manager