What are rocker switch types

There are many rocker switch types based on different classifications. This article will introduce the common rocker switches for you.

Common rocker switch types By Pole and Throw

SP and DP refer to single pole and double pole, ST and DT refer to single throw and double throw.

Pole refers to the number of circuits controlled by the switch: SP switches control only one electrical circuit. DP switches control two independent circuits (and act like two identical switches that are mechanically linked). Do not confuse ‘pole’ with ‘terminal’. The DPST switch, for example, has four terminals, but it is a DP, not a 4P switch.

Throw refers to the extreme position of the actuator: ST switches close a circuit at only one position. The other position of the handle is Off. DT switches close a circuit in the Up position, as well as the Down position (On-On). A DT switch can also have a center position (frequently On-Off-On).

Single pole/throw and double pole/throw switches are by far the most common switches, but triple and quadruple configurations are also available. They are commonly denoted 3PST, 3PDT, 4PDT, etc.

Single Pole, Single Throw (SPST)

The single pole single throw (SPST) switch has only one input and output. It’s our typical on/off switch that controls one circuit at a time.

Single Pole, Double Throw (SPDT)

These switches have one pole (input) and two throws (outputs). You can use them to control two dissimilar circuits through a single input. They can either be controlled manually or via an electromagnetic coil.

Double Pole, Single Throw (DPST)

The double Pole Single Throw (DPST) switch has 4 terminals – two inputs and two outputs. Each input has one corresponding output, and the switch is used to control two independent circuits simultaneously. A DPST switch has an On/Off configuration where its terminals either maintain an On or Off position.

Double Pole, Double Throw DPDT)

Double Pole Double Throw or DPDT switches are the most advanced types of switches on the list. They have two input terminals, and each input has two output terminals totaling around six terminals.

Rocker switch types by function

1. On-Off / Off-On Rocker Switches

These are the most basic and common rocker switches, used to control the power state of devices. They feature two stable positions—one for “on” and the other for “off.”

Applications:

Industrial machines and control panels

HVAC systems and motor controls

Power tools and lighting systems

2. Illuminated Rocker Switches

Illuminated rocker switches come with built-in LEDs or incandescent lights that glow when the switch is activated, providing visual feedback. This feature is particularly useful in environments where visual indication of equipment status is essential.

Applications:

Power distribution boards and control stations

Industrial automation systems

Safety equipment and alarms

3. Momentary Rocker Switches

Momentary rocker switches return to their default position after being pressed. They are designed for applications that require temporary operation, such as activating a specific function only when the switch is pressed.