In modern days most industries and substations prefer this disconnector switch. The double-arm pantograph disconnector switchconsists of two vertical blades, These two blades are working parallelly and disconnect the circuit as same as a vertical pantograph. Double arm pantograph disconnector switch This linkage mechanism is movable from upward to downward while disconnecting. So it is called a Vertical Pantagraph break disconnector switch. pantograph linkage mechanism is provided in a vertical position. Vertical pantograph disconnector switchĪ vertical pantograph break disconnector switch consists of a vertical blade.

The horizontal conductive rod is a pantograph mechanism. Horizontal Pantograph disconnector switchĪ horizontal pantograph disconnector consists of a horizontal blade to disconnect the circuit or feeder in a horizontal position.

Double arm vertical pantograph disconnector switch.

vertical pantograph disconnector switch.

Horizontal pantograph disconnector switch.

Types of the disconnect switch or Isolatorĭisconnecting switches can be classified into various types based on their operation, construction, and mounting arrangement.

Used to isolate the high voltage equipment from live components during service.

Disconnecting switches are offload switches ie, they can operate only with no power supply.

In simple words, during the maintenance time, two disconnecting switches should be in Open condition, and the Circuit breaker also be in the open position. During functional check or repair the circuit breaker, disconnecting switches, or isolator switch(T1) has to be in the open position from the busbar and T2 is also in the open position to disconnect the circuit breaker completely from the circuit or feeder. The above single line diagram clearly explains that disconnect or isolator switches (T1 and T2)have connected on both sides of a circuit breaker.

Circuit breakers are closed after closing the isolator.īy installing an isolator switch, in a substation or Industry, we can ensure personnel safety, at the time of maintenance.

The isolator closes only after the closing of the isolator. Marked with isolator symbol White moulded surface mount BS EN 60947-3, BS EN 60669-1 Local isolation of fans with or without timers With fan symbol.

Earthing switches are closed after opening the isolator.

The isolator opens only after opening the circuit breaker.

Relay consists of a coil of wire wrapped around a soft iron core, an iron yoke which provides a low reluctance path for magnetic flux, a movable iron armature, and one or more sets of contacts.Īs you can see that there are lots of switches and relays symbols in our engineering software, which will greatly facilitate your drawing.We must follow some procedures to open and close the isolator or disconnector to safeguard our electrical equipment and life. Switch is a device for making and breaking the connection in an electric circuit.

Read basic electrical symbol and electrical symbols introduction to get more information. The picture below is switches and relays symbols including switch 1P, isolator 1P, circuit breaker 1P, spring return, time delay break, fuse, relay contacts, relay oil, relay, etc. All these shapes will greatly help you when you draw the switches and relays diagrams. Offers you many switches and relays symbols, such as switch 1P, isolator 1P, circuit breaker, position switch, etc. Pre-drawn switches and relays symbols represent switch 1P, isolator, SPST, SPDT, DPST, DPDT, relay contacts and relay coils, etc.

Symbol of isolator switch