What is the main difference between switch gear , isolator & circuit breaker???

Answer 1

switch gear is the general term for Circuit Breaker, Switch disconnector, isolator etc.,

Isolator is the term used when it was used to isolate the electrical circuit ( which can be switched off MANUALLY}

circuit breaker can be used to break the circuit on any abnormal condition automatically ( eg MCB,MCCB,VCB,SF6CB,MOCBetc.,)

Hope this answer your question

Answer 2

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Major difference between isolator and circuit breaker is that isolator is an off-load device, whereas circuit breaker is an on-load device. (An isolator switch is part of an electrical circuit and is most often found in industrial applications. The switch does exactly what its name suggests in that it electrically isolates the circuit or circuits that are connected to it. Such a switch is not used normally as an instrument to turn on/off the circuit in the way that a light switch does. Either the switch isolates circuits that are continually powered or is a key element which enables an electrical engineer to safely work on the protected circuit. Isolator switches may be fitted with the ability for the switch to padlock such that inadvertent operation is not possible. In some designs the isolator switch has the additional ability to earth the isolated circuit thereby providing additional safety. Such an arrangement would apply to circuits which inter-connect power distribution systems where both end of the circuit need to be isolated. An isolator is a switch connected after a circuit breaker. When a circuit or a busbar is taken out of service by tripping the circuit breaker, the isolator is then open circuited and the isolated line is earthed through earth switch so that the trapped line charges are safely conducted to ground. A circuit breaker is a complex circuit -breaking device with the following duties: Make or break both normal and abnormal currents, Appropriately manage the high-energy arc associated with current interruption. The problem has become more acute due to interconnection of power stations resulting in very high fault levels, Effect current interruption only when it is called upon to do so by the relay circuits. In fact they are required to trip for a minimum of the internal fault current and remain inoperative for a maximum of through fault current, Rapid and successive automatic breaking and making to aid stable system operation, 3-pole and single pole auto-relosing arrangement. In addition to these making and breaking capabilities, a circuit breaker is required to do so under the following typical conditions: Short-circuit interruption Interruption of small inductive currents Capacitor switching, Interruption of short-line fault, Asynchronous switching.

Answer 3

Switch gear is a isolator used for high voltage, more than 6000v, it is oil filled to prevent arcing and works on a snap action. Isolators are any switch, light switch, stove switch. Circuit breaker is a switch that monitor the current in a circuit and switches of if the current exceeds a set limit

Answer 4

switch gear is the general term for Circuit Breaker, Switch disconnector, isolator its ok.

isolators are used for isolating supply but not when a system is working. AN ISOLATOR CONNOT INTERUT ANY CURRENT.its a on off switch connected before and after circuit braker. Before operating a isolator CB must be triped OFF. because only CB can iterupt any switching current.normally both will be interlocked we can only operate isolator only afer CB is triped.CB can be operated at any time it have arc quanching facility being aonly switch isloator canot interrut any fault current. Using isolator we can assured that supply is disconnected. in the cause of CB it is not possible

Answer 5

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

Answer 6

switch gear is the general term for Circuit Breaker, Switch disconnector, isolator etc.,

Isolator is the term used when it was used to isolate the electrical circuit ( which can be switched off MANUALLY}

circuit breaker can be used to break the circuit on any abnormal condition automatically ( eg MCB,MCCB,VCB,SF6CB,MOCBetc.,)

Hope this answer your question

Answer 7

A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow.

The term switchgear, used in association with the electric power system, or grid, refers to the combination of electrical disconnects, fuses and/or circuit breakers used to isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work to be done and to clear faults downstream.

An isolator(disconnecting switch)operates under no load condition and 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.

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