What is SPST and DPST?

SPST simply mean single pole, single throw. The product controls one circuit with one On position. SPDT means that it is a single pole double throw which means it has two ON positions. DPST again means it controls two separate circuits but it only has one On position.

What is a multi pole relay?

Standex Electronics typically will manufacture up to four reed switches in a given relay. This could be up to 4 single pole normally open switches, up to 4 single pole normally closed switches, or up to 4 single pole double pole throw switches.

What is a 4 pole double throw relay?

The 4 Pole, Double Throw action provides four separate single pole double throw contacts that can be used for a variety of applications. The most common use of the 4PDR is a slave damper control relay to control more than one damper from a single switch or zone on a control panel.

What is Spst?

A Single Pole Single Throw (SPST) switch is a switch that only has a single input and can connect only to one output. This means it only has one input terminal and only one output terminal. A Single Pole Single Throw switch serves in circuits as on-off switches. When the switch is open, the circuit is off.

What is difference between SPDT and DPDT switch?

The SPDT has a simple input switch that connects to two output devices whereas DPDT has two SPDT circuits and thus it can control two separate circuits at the same time. The DPDT switches are thus more advantageous than the SPDT switches are they are capable of controlling two different appliances at the same time.

What is a 4 pole relay?

4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power on a single circuit. There are 2 types of 4 pin relay available; normally open or normally closed. A normally closed relay will switch power OFF for a circuit when the coil is activated.

When would you use a DP switch?

A double pole switch can be used to control light and a fan or 2 lights on separate circuits. It is easy to wire a double pole switch to work as a single pole switch because only one side is used instead of both.

What does single pole triple pole switch mean?

The word “throw” simply refers to how many ON positions the switch has. So if you have a triple throw switch it has 3 on positions. SPST simply mean single pole, single throw. The product controls one circuit with one On position.

What do triple pole ( TP ) electromechanical relays do?

Triple Pole (TP) Electromechanical Relays. Description. The T16 thermal overload relays are economic electromechanical protection devices for the main circuit. They. offer reliable protection for motors in the event of overload or phase failure.

What’s the difference between triple pole single throw and single pole triple throw?

The word “throw” simply refers to how many ON positions the switch has. So if you have a triple throw switch it has 3 on positions. SPST simply mean single pole, single throw. The product controls one circuit with one On position. SPDT means that it is a single pole double throw which means it has two ON positions.

What’s the difference between DPST and triple pole?

DPST again means it controls two separate circuits but it only has one On position. DPDT means it has two on positions and can be configured above the same as a single pole can be. 3P usually indicates three poles, sometimes if it is a triple throw meaning 3 on positions it can be labeled for example as : SP3T or SPTT.