Q:

How does a double-pole switch work?

A:

Quick Answer

A double-pole switch has two connectors (poles) that can control two circuits. A double-pole, single-throw switch (DPST) turns two circuits on or off. A double-pole, double-throw switch (DPDT) manages two circuits and turns both on and off together.

Know More

Full Answer

Most manufacturers use the abbreviations DPST and DPDT to indicate switch types. The term pole (P) refers to the number of connections on a switch, while throw (T) refers to the number of possible positions (on or off) for a given circuit, with single (S) or double (D) referring to quantity.

The simplest switch is a single-pole, single-throw (SPST) with one input and one output controlling a single circuit. Most household light switches use SPST. The DPST switch has three connections, one input and two outputs. When there are two circuits, A and B, the DPST switch allows either circuit A or B to be on but not both circuits. The DPDT has six connectors, two inputs and four outputs that allow switching circuits A and B on or off together. These three versions comprise most of the switches used in circuits, particularly for power management. For multiple connections on a circuit, engineers may use a rotary switch, with one input and many outputs.

Learn more about Electrical

Related Questions

  • Q:

    What is a single-pole changeover switch?

    A:

    Also called a single pole double throw switch, a changeover switch has a single input and can connect to and switch between two outputs. This means it has one input terminal and two output terminals.

    Full Answer >
    Filed Under:
  • Q:

    What is a double pole electrical socket?

    A:

    Double pole sockets operate two separate electrical circuits in a single circuit. Double pole sockets switch the live and neutral conductors. Double pole sockets are often used in home lighting situations where red wires are live, and black are neutral and the green wires are Earth or grounding wires.

    Full Answer >
    Filed Under:
  • Q:

    What is a double-pole socket?

    A:

    A double-pole socket is used for 240-volt circuits, has four terminal screws to connect two 120-volt hot wires, and always has a ground terminal screw. Wiring a double-pole socket is similar to wiring two single-pole sockets separately.

    Full Answer >
    Filed Under:
  • Q:

    How do I wire a double-switch light?

    A:

    Wiring a double light switch is a simple job that the average homeowner can do. However, it's important to use extreme caution when working with electricity. The required materials are a voltage tester, screwdriver, electrical tape, wire cutter, wire stripper and grounding wrist strap.

    Full Answer >
    Filed Under:

Explore