Single Pole Single Throw Switch Definition

Sp switches control only one electrical circuit.

Single pole single throw switch definition.

A single pole double throw switch can serve a variety of functions in a circuit. Single pole single throw spst switch circuit. A single pole single throw switch serves in circuits as on off switches. An industry expert discusses use of the weibull distribution for life testing electromechanical relays.

When the switch is closed the circuit is on. Whereas a single pole switch has on and off markings a three way switch doesn t. A double pole switch is what you need to control a 240 volt device because 240 volt circuits have two hot wires. The two most common types are single throw and double throw.

A single pole double throw spdt switch is a switch that only has a single input and can connect to and switch between 2 outputs. Below is an example of a circuit which utilizes a single pole single throw switch. It has four terminals. Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw.

The number of throws indicates how many different output connections each switch pole can connect its input to. A double pole switch is like two separate single pole switches that are mechanically operated by the same lever knob or button. Single pole single throw normally closed a simple on off switch. That s because the three way switch is used in conjunction with another three way switch to power a single light fixture and turning the light fixture on and off may require different lever positions.

The first device was a single pole single throw spst relay and the second a four pole single throw fpst relay. The difference between a single and double pole switch is that the latter controls two circuits at the same time. An example is a pushbutton switch. It can serve as an on off switch depending on how the circuit is wired.

Spst switches are thus very simple in nature. This means it has one input terminal and two output terminals. A single throw switch is a simple on. When the switch is open the circuit is off.

Pole refers to the number of circuits controlled by the switch. An example is a light switch. Single pole single throw normally open a simple on off switch. Dp switches control two independent circuits and act like two identical switches that are mechanically linked.

The two terminals are normally disconnected open and are closed when the switch is activated.