A combination of components
Switchgear is the combination of electrical disconnect switches, fuses, circuit breakers, current and voltage transformers, measurement devices, signaling and protection relays. It is used to distribute and control energy for all types of loads, intended for industrial, commercial and similar applications where operation by personnel is not intended.
Power and control circuits
Inside switchgear, we have two main circuits:
- Power circuit: composed of busbars, switching devices, current and voltage transformers, power cable connections, etc.
- Control circuit: composed of push button, metering devices, protection relay
Number of feeders
Switchgear must have at least two functional units or feeders; a cubicle with a single breaker is not a switchgear. A cubicle with two breakers (in/out) is the minimum to be considered a switchgear.
Component interactions
Interaction and coordination between the different apparatus, like a Direct On Line motor starter, is another key element to define a switchgear compared to a group of products.
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