Features and design of a two-button switch

  • Dec 14, 2020
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There are a huge number of switches equipped with two keys, but in practice this is not the only criterion. Since similar features are inherent in some types of pass-through and cross-over switches. Therefore, in order not to get confused in such devices, it is necessary to understand in detail their design and functional features.

The main task of a two-button switch is to divide the supply conductor into two independent lines, commutated by two separate buttons. Therefore, when you connect the device, you will find three pins on the back, as shown in Figure 1 below:

Figure: 1. Features of the double rocker switch
Figure: 1. Features of the double rocker switch

The three clamps are for:

  • 1 - transmission of electricity to the first group of lighting equipment;
  • 2 - transmission of electricity to the second group of lighting equipment;
  • L - used to connect the phase conductor from the wiring;

On the switch body itself, there is also a diagram of a two-button switch, which shows the principle of operation and switching of contacts.

Figure: 2. Two-button switch device
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Structurally, a two-button switch consists of the following elements:

  • Keys - designed for manual control of the switching process. In accordance with clause 10.2 of GOST R 51324.1-2012, they are made of insulating material to prevent human hands from contacting live parts.
  • Contact group switch - transfers the contacts of the switch to the on or off position. The design of each switch in a particular model allows for direct connection to a key.
  • Switch module - the main switch block containing the contact group and the mechanism that sets them in motion.
  • Retainer - in this model, it is made as a separate part and is used to fasten the false panel to the switch module. It can also be made in the form of locks on a module or a false panel, as an integral part of them.
  • False panel - used to decorate the switch. It can be matched by color for interior design.

Some models can be configured with a light indication of the disabled state. An LED is installed inside the switch keys or in a false panel, which lights up in the off position. This option makes it easier to detect the two-key device in the dark, but makes its own adjustments when using LED and fluorescent lamps.