What is the difference between single pole double throw switch and single pole single throw switch?

Answer 1

US Single-pole switchIn the US, the standard "single-pole" light switch is single-pole single-throw, with only 2 terminals. In the ON position it connects the two terminals, and in the OFF position it doesn't.

The standard US "3-way" light switch (used for switching a light from two different switches) is single-pole double-throw. It has 3 terminals (hence the term "3-way"), and it connects one of those terminals to either of the other two, depending on the switch position. There's no OFF position, so the switch has only two positions.

Answer 2

This question actually gives its own answer exactly: the switch has only one pole. (Meaning it can switch only one wire.) The switch can be used to connect or disconnect that one pole with only one "throw". (Meaning you can only use it to switch that single wire on or off.)

Answer 3

.............................../ Pole 1 ---------------O O---------------------- | | ................................/ Pole 2 ----------------O O--------------------- | Two single throw switches mechanically joined together so that their individual poles are switched simultaneously. One throw actuates both poles. Example: that doubled air conditioner circuitbreaker. Add another position for each flapper "/ " and you have a double pole double throw. Periods .... were used to place flappers, which should connect to the O's below them. Graphical interface would be helpful. Throw = switching actions available to different circuit paths Pole = a power line connection to switch to the different paths.

Answer 4

Single pole only switches the live wire. Double pole switches live and neutral.

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The electrical code only allows the neutral to be switched in one type of installation. It is in explosion proof wiring for fuel pump dispensers.

In North America a double pole switch is used to isolate 240 volt installations. This is where both legs of the 240 supply have to be isolated from the load for safety reasons.

Answer 5

Single pole, single throw

A single pole, single throw switch can be operated to send current only to one other part of a circuit.

So it can be used to switch something on or off.

Single pole, double throw

A single pole, double throw switch can operate to send current either to one part or to another part of a circuit.

So it can be used to switch something on whilst switching something else off, or vice versa.

Manually operated switches and electrically operated relays are available as "single pole, single throw", "single pole, double throw", "double pole, single throw", "double pole, double throw" and in many other variants of poles and throws.

Answer 6

A single pole single throw switch is like the one on your wall in your residence. The switch has two wire terminal points. In the off position the contacts inside the switch are open and prevents the circuit current from flowing. In the on position the contacts inside the switch are closed and that allows the circuit current to flow and the device that is connected in the circuit to operate. In the electrical trade these types of switches are identified by the letters SPST.

Answer 7

A single pole double throw (SPDT) switch has three terminals: one input and two outputs. It can connect the input to either of the two outputs. A single pole single throw (SPST) switch has only two terminals: one input and one output. It simply opens or closes the circuit.

Answer 8

SPDT) Three terminal switch in which one terminal can be connected to either one of the other terminals. (from online electronics dictionary)

Answer 9

The function of a single pole single throw switch or SPST switch is to make or break a single set of contacts in an electrical circuit.