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An isolator(disconnecting switch)operates under no load conditionand used for disconnecting the CB from the live part of the maintenance.Isolators are used in addition to the CB to make and break the circuit under normal and short circuit condition.
A circuit breaker(CB) is an equipment which can open or close a circuit under normal as well as fault conditions and it can be operated manually under normal conditions and automatically under fault conditions.For the latter operation a relay is used with a CB.
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DevinLoad Breaker Switch:
Load Breaker switch act as circuit protection device, it contains some characteristics like over load, short circuit protection. Eg: MCBs,MCCBs
Isolator:
Isolator act like a manual on - off switch, manually isolate from the main circuit for maintenance purpose that's all, these device don't have any other protection for the circuit.like short circuit and over load.
Switch gear is a general term used for protection n switching devices.
Isolator is a device which is used to break a circuit when the circuit has been de-enegised by oening a circuit breaker. it is usually employed on transmission lines. it is opened manually to repair the lines. it does not give automatic protection n does not have arc extinguishing mechanism.
Eg Three Pin Isplator
Circuit Breaker is a device which breaks a circuit either manually or automatically under normal conditions or breaks a circuit automatically under faulty conditions. It has arrangement for arc extinction produced when circuit is broken Eg oil cb, vaccou cb.
An isolation switch is used for safety purposes. eg. On a remote motor that has fan belts running a fan, and you need to shut off the fan to change the belts. You shut the isolation switch off. It should be in line of sight of the fan so that you can visually see that the power is off. It is safer that shutting the power off at the source and not being able to see that it is off. In a perfect world the fan should be locked off at the source but this doesn't always happen. A breaker is used to protect the wire feeding the load from an overload by tripping off when the breaker amp value is reached. It is sized according to the load amps of the device.
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What is difference bitween air break switch and load break switch?
Both are types of isolators of a power circuit. Load break switch is an isolator where circuit can be isolated on load. The quenching media could be air, oil or gas..... Air break switch is type isolator where isolation takes place in the air itself. (break contacts are not immersed in oil, gas ...) But whether these isolators can be opened on load or not can be said only by looking at the desgin data. Some isolators are designed to open and close on load.
What is Disconnector Switch?
to disconnect the circuit when faults occursAnswerA 'disconnector switch' is another term for an 'isolating switch' or 'isolator'. It is a manually-operated switch used to provide a visible break between a de-energised part of a circuit and the energised part of a circuit so that work can be carried out safely on the de-energised part. A disconnector switch is not intended to break a load current, and most certainly not designed to break a fault current -that is the function of a circuit breaker.
What is a 132 KV line isolator?
An isolator (disconnector in US terminology) is a switch designed to isolate a section of line afterthat line has been de-energised using a circuit breaker, allowing maintenance work to be carried out on the de-energised section.It's function is to provide a visual break between an energised line and a section of de-energised line and, therefore, is usually one of a pair (one at opposite ends of the de-energised section).Isolators are generally not designed to break load currents (and definitly NOT fault currents!!), so the line must be de-energised using a circuit breaker before the isolator is opened, and the isolator must be closed before the circuit breaker is then used to reclose the line.
What is the difference between cut in and break down voltage?
what is the difference between cut- in and cut -out
What is the difference between malleable and brittle?
brittle materials get break when subjected to stress but malleable do not.
