Many devices are used in an electrical network for safety reasons, and each of these devices need to be kept in good condition within the system, including the switch disconnector. A switch disconnector is primarily associated with the load switch or circuit breaker.

What is a switch disconnector? How does it work?

A switch disconnector (on-load isolator) is used to disconnect electrical equipment safely for the purpose of maintenance and repair, allowing electricians/professionals to access the necessary equipment and devices to complete the required job. Additionally, it can break and make the energized circuits.

There are different types of disconnectors available, with some being operated manually. The domestic range of switch connectors include a toggle type handle and within industrial applications it may operate with a direct/extended type handle. Usage will vary depending on the type of disconnector installed

Is it possible to use a switch disconnector in place of miniature circuit breaker?

No, it is not possible and doing so may incur serious harm. A switch disconnector cannot detect and interrupt an overload or fault condition, like a miniature circuit breaker can, and would likely result in the switch disconnector melting or bursting into flames.

The BIG difference between MCB vs Switch disconnector.


Miniature circuit breakers 


Switch Disconnectors 

Product with symbol 

Text Box           


Text Box 

Construction Mechanism 

Electromechanical switch 


Simple mechanical switch. 


Automatically and manually 



Main functions 

Disconnects the circuit in case of overload and short circuit faults 


Switch and provides isolation functions. 


Circuit Breaker interrupts the normal currents and short circuit currents during faults. 


Switch disconnector does not interrupt any current. It only isolates and switches the circuit. 

Protection against short circuit & Overload 




Tripping characteristics 

B, C, D and K curves 


Not applicable 

Additionally, the switch disconnector will disconnect the power or current when activated, enabling the maintenance, repair, or inspection to be completed safely, additionally the switch has a combined function of switching and isolating. Previously highlighted, there are various types of switch disconnectors available, with IPD offering the best products in the market.

The two series available are the SHD200 and E200, each series is available with 1 to 4 poles with rated currents from 40 to 125 A and provides disconnection properties according to IEC/EN 60947-3.

Rated voltage 230/415V AC and a rated conditional short-circuit current of 10 kA enables a wide range of use SHD200 series with back-up protection.

Wiring Diagrams

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