The difference between onload and off load switch disconnectors

Know About Disconnector:

A disconnector is a no-load switch (not designed to break load current or fault current) used primarily in substations and occasionally in distribution. Rich power offers good quality switch disconnector and spare parts of disconnector including post porcelain insulator and post polymer insulator.

Why Required Disconnector

Disconnector provides permanent opening of a circuit afterthe tripping of a circuit breaker under fault condition. Further it provides visual confirmation of a circuit condition (open or close) assuring safety to substation service personnel. They also enable sectionalizing lines during maintenance / fault isolation.

On load switch disconnectors:

it is a switch disconnector that can open and close the circuit on load and perform the isolation required.


  • Modular pole design – economical maintenance
  • Available in open / sheet steel enclosure version
  • Quick make & break mechanism, self cleaning contacts
  • Compact construction
  • Door interlock and padlock facility
  • Suitable for isolation
  • Telescopic shaft for depth adjustment
  • Door defeat
  • Provision for 2NO+2NC aux contacts

Off Load switch disconnectors:

It is a switch disconnector that must open and close the circuit when the load is off (it can not operate on nominal load) – For example – Earthing switches is used with CB during maintenance.

The INS Switch is off the on-load type

Rich power group is a professional supplier and maker of disconnector switches in China, we can produce the complete products and also provide the spare parts to our customers. We are also looking for sales agent for our separable connectors according to the standards of IEC and IEEEE. Separable connector is suitable for all switchgear.
As mentioned earlier, there are different types of switch disconnectors. You can find the best ones from us, Changsha rich power company produces post porcelain insulators for the switch disconnector.

How Do Disconnectors Work?

The objective of a disconnector is to offer electrical disconnect. Most of them come with a motor-operated or manual drive mechanism. Users will have to select the correct operating method for a specific substation. The disconnector mechanisms feature many auxiliary switches. The switches will offer a remote indication about the electrical interlocking, disconnector position, and current transfer switching.

There will be earthing switches. These switches are associated with the disconnectors. These interlocked switches will be mounted on the same frame. However, a separate mechanism will be used. It will avoid the requirement of different post insulators for earth switches. Also, it will simplify the interlocking. Usually, the earth switches are made for isolated and dead circuits. They do not come with a fault-making ability. If you want fault making ability, you can consider some specific designs.

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