![]() ![]() Isolator / Disconector should not be opened when the current is flowing through it. It can be operated in both cases where the power supply from utility pole is ON or OFF. It only isolates the circuit for maintenance purpose.Ĭircuit Breaker can be opened during the flow of current through it. Single or Double Earth Switches can be included in Disconnector.Ĭircuit Breaker interrupts the normal as well as short circuit currents during faults. In Isolator, there is no overvoltage rise during switching as it is an OFF-Load device.Įarth Switches are not included in the the circuit breakers. In Circuit Breakers, there is a chance of rise in overvoltage during switching operation. Isolators don’t require insulation or insulation medium. In CB, Air, Oil, Vacuum or SF6 gas are used as insulation medium. Isolators have low withstand Capacity as compared to circuit breakers.Ĭircuit Breakers can be used to re-route the power Supply.ĭisconnector can be used to re-route the power supply. Disconnector can be operated when the power supply is totally OFF.Īt ON-Load Conditions, Circuit breaker has the high withstand Capacity. it operates when the power supply in ON or OFF. Pantograph ,Knee, Double Break, Center Break, Earthing etc.Ĭircuit Brekaer is an ON-Load and OFF-Load Device i.e. MCB (Miniature), ACB (Air Blast), OCB (Oil), SF6 etc. disconnecting the supply from all or a portion of installation e.g. Isolator is a Mechanical Device act as Switch and provides isolation functions.Ĭircuit Breaker is a protection device (such as MCB, ACB, SF6, OCB etc) which disconnects the circuit in case of overload and short circuit faults.ĭisconnector and Isolator switches provide isolating function i.e. Isolator and Disconnector are operated Manually.Ĭircuit Breaker is an Electromechanical or electronic device and relay mechanism. Isolators and Disconnectors are types of simple mechanical switch.Ĭircuit Breaker is operated Automatically and Manually. The following table shows the main differences between Isolators, Disconnectors and Circuit Breakers.Ĭircuit Breaker consists of electromechanical switch and a relay in a single box. Related Post: Main Difference between Fuse and Circuit Breakerĭifferences between Circuit Breaker and Isolator / Disconnector.A relay inside the circuit breaker sense the errors signal and sends to the mechanical switch which make and close the contacts. It also capable to operate automatically, manually or by remote control in normal and faulty conditions. It break the circuit in case of fault conditions like short circuit and overload. Related Post: Difference Between Relay and Circuit BreakerĪ Circuit Breaker is a protective device used to control the flow of current same like a fuse. There may a physical and construction difference between Switch Disconnectors, Load Switches, Disconnectors as Isolating Switches but the function is almost same.Keep in mind that isolator or disconnector should not open when the current is flowing through it.HV/MV Switch Disconnectors And Isolators are used where power installations exceeding 1 kV AC (IEC- 61936-1). Switch Disconnectors are used in MV installation nowadays. HV and MV Switch Disconnectors and Isolators are used in high voltage equipment such as transformer, substation etc. ![]() ![]() Isolator blocks the DC current and allow the AC current to flow through it (same like a capacitor). It is used where we need to disconnect a portion of the circuit in case of faults from the main power supply for maintenance purposes. Characteristics of Switch DisconnectorsĪs the name suggests, An Isolator or Disconnector is an isolating or disconnecting switch which disconnects or isolate the whole or a specific part of the circuit.Different Characteristic of Isolator, Switch Disconnector and Circuit Breaker.Differences between Circuit Breaker and Isolator / Disconnector. ![]()
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