71C30-2CR-2CE

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A rotary switch is an electrical switch where a circular knob rotates to make the connection between a set of contacts. They are mainly used to replace the position switch and on/off switch, and are mainly used in the electric field. One of the most used switches is the 71C30-2CR-2CE, so let’s take a look to its applications and working principles.

The 71C30-2CR-2CE has three contact levels with 30° separation. The electrical connections are made in pairs breaking the other pairs at the same time. These switches have a maximum contact current of 2A and 4A for resistive load and inductive loads accordingly. Additionally, these switches are designed to use a maximum voltage of 250VAC.

The 71C30-2CR-2CE has two major applications. The first is as an on/off switch for motor starting. The switch is connected to the electric motor wiring and when an electrical output is sent to the switch, the contact is closed between two leads sending the electric current to the motor. The second major application is in control circuits. For example, in industrial plants, this switch is used to start the circuit based on user’s choice. It is also used in different circuit control applications due to its multiple contacts and ability to disconnect several circuits simultaneously.

The working principle of the 71C30-2CR-2CE is quite simple. The electrical connection is made through a contact cage where the contacts are attached. When the switch is in the off position, the contacts are separated due to the shape of the contact cage, thus, preventing an electrical connection. As the switch is rotated, the contact cage moves up and down depending on the motion direction and makes the connection between the contacts which are in contact. As the electrical connection is made, the contacts already attached, move down and disconnect from the other contacts.

To sum up, the 71C30-2CR-2CE is a rotary switch mainly used as an on/off switch in motor starting applications and in different circuit control applications. Its working principle is based on a contact cage where the connected contacts move and make the connection between them when the switch is rotated.

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