What are Selector Switches?

There are different styles, models, brands of switches that include illuminated, non-illuminated, non-illuminated key operated. These switches can be found in styles like the spring return or maintained style, LED or incandescent and the 3-50 amps. You will need to ask a specialist to identify the best switch that will work better with your application.

In this post, we will be reviewing the construction and the functionality of the non-illuminated selector switches.

What do you know about a selector switch?

These switches function using a basic principle; they consist of a selector switch at the front of the panel and a wide range of useful contact combinations that are installed within the casing. The major difference between the push button and the selector switch is in the way they work to achieve the same task. While the push button has a plate that moves down to push the contact plungers, a selector switch contains a rotating cam that has ridges and flats which allow the actuation of plungers independently.

There are three versions of selector switches depending on their position which include the 2,3, or 4 positions. These are normally used when one or more than a single control option is required. Normally the central position of the selector switch is referred to as the starting cam point. The left position pushes the left plunger within the selector switch. When the selector switch is turned to the right it pushes the right plunger.

Mechanism of selector switches

The selector switches rely on cams together with contact blocks in offering a wide range of circuit openings and closings. It also consists of indicating lights. Configuring a selector switch is a way of commanding a machine about how it should operate. The indicating lights inform the operator what the machine is doing or what it has dialed to do. A light that is attached to the machine process, when it is on it means that the machine is working.

The selector switch is idle in a situation where more than one control option is required. Also, there are used whenever there is a need for maintaining contact is required.

The contact blocks

The contact blocks are among the important components of the selector switches. They normally have normally open and/or closed settings. The single circuit has a contact block which can be a normally open or normally closed circuit. This is efficient for the application that needs only a single contact block. The combination consists of:

  • A single normally open and a single normally closed contact
  • A single normally open contact
  • Double normally open contacts
  • Double normally closed contacts
  • A combination of both having a special delay opening or early closing contacts

The dual-circuit contact blocks are the best when it comes to saving space in casings and bring in double functionality to a switch as a single switch can operate two circuits. If there is a need, you can add more contact blocks in order to increase functionality options.

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