Why so many names for the same thing?
Are all switches rated as load break switches or as isolators?
In other words, if you see 10A – and that’s all we got – can we use this as a load break switch?
Or is there even a difference?
Linguistically switch will refer to anything with an actuator (lever) to operate contacts braking/making an electrical circuit. Done.
Isolator: The sole purpose of this device is to remove /apply power for an installation/enclosure/machine/motor and it has to do so according to the relevant standards. For the most part an isolator will switch ALREADY OFF STATE equipment on and off. In other words one switches it on – the power is on and then press the start button and the plant starts and controls continue.
Load break switch/[Switch disconnector / onload isolator=SANS10142]: As implied by its name…one can stop/start the plant from this switch…It is designed to endure any starting currents from motors etc.
So, all switches are switches but
All switches are not isolators or load break switches
and
NOT all isolators are load break switches and, technically, vice versa too…but I have not found a manufacturer with a load break switch that does not qualify as an isolator.
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