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065: How to choose selector switch for electrical panel

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Selector switches are used to control ON or OFF of electrical circuits by changing the contacts and are available in below types:

  • Toggle switch: control by handle (knob) and changing the contacts.
  • Rotary switch: control by rotating and changing the contacts.
  1. A) 3 way (position state)
  2. B) 4 way (position state)

Note1: For rotary switch direction is not important. It can rotate clockwise or counter clockwise.

We use different types of selector switches in electrical panel:

  • SPST: Single Pole Single Throw (2 Terminals, Toggle switch)
SPST

2- SPDT: Single Pole Double Throw (3 Terminals)

SPDT

3- DPST: Double Poles Single Throw (4 Terminals)

 

 

DPST

4- DPDT: Double Poles Double Throw (6 Terminals)

 

DPDT

Note2:
Pole: Number of circuits (wires).

Throw: Number of positions (connection).

So for electrical panel normally we need below switches:

  • Toggle switch: Basic ON/OFF switch, ON/Bypass, Manual/Auto
  • Ampere-meter selector switch (Ammeter selector switch): To reduce the number of Ampere meters (Ammeters) and save money. It select the line which we want to read the ampere value at each time.
  • Volt-meter selector switch: same as Ammeter for volt measurement.
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