Right Price of Combination Light Switch for Cars, Trucks

What combination switch? Function and application of combination switch.
Combination switch refers to a switch that is often introduced as a power supply in electrical control circuits. It can be used to directly start or stop a small power motor or make the motor run forward and reverse, reverse and so on.
Brief introduction of combination switch
Combination switch, also known as transfer switch, is often used as a switch for power supply in electrical control circuits, which can directly start or stop low-power motors or make motors run forward and reverse, reverse, и т.н. It is also commonly used to control local lighting circuits.

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There are several kinds of combined switches, such as single pole, double pole, three pole and four pole, and the rated continuous current is 10, 25, 60, 100A and so on.
Combination switches can simplify the control loop or measurement loop, and can avoid operational errors and mistakes to a certain extent.
The combination switch is composed of multiple unipolar rotary switches mounted on the same shaft.

Combination switch structure
Combination switch is composed of moving contact (moving contact piece), static contact (static contact piece), rotating shaft, handle, positioning mechanism and shell. The moving contacts and static contacts are respectively stacked between several layers of insulating backing plates, and each is attached with a terminal for connecting the circuit. When the handle is turned, the movable contact of each layer rotates together with the square shaft, so as to realize the on-off control of the circuit.
There are 3 pairs of static contacts inside the combination switch, which are separated by 3 layers of insulating plates, and each has a wiring post for connecting the circuit. The three moving contacts are insulated from each other, correspond to their respective static contacts, and are set on a common insulating rod. One end of the insulating rod is equipped with an operating handle, and the handle can be turned 90° every time to complete the opening and closing or switching between 3 sets of contacts. The switch is equipped with a quick-break spring to accelerate the breaking speed of the switch.

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Combination switch selection
Combination switch is a switching device with small size, multiple wiring methods and very convenient use. Pay attention to the following points when choosing a combination switch.
(1) The combination switch should be selected according to the voltage level, capacity and required number of contacts of the electrical equipment. When the combination switch is used in general lighting and electric heating circuits, its rated current should be equal to or greater than the sum of the load currents in the controlled circuit. When the combination switch is used to control the motor, its rated current is generally 1.5~2.5 times the rated current of the motor.
(2) There are many wiring modes for the combination switch, and it should be possible to correctly select the product of the corresponding specification according to the needs.
(3) The combination switch itself does not have overload protection and short circuit protection. If such protection is required. It is necessary to set up other protective devices.

Combination switch use and maintenance
(1) Due to the low on-off capacity of the combination switch. Therefore, it cannot be used to break the fault current. When it is used to control the motor for reversible operation, the reverse connection must be allowed after the motor stops completely.
(2) When the operating frequency is too high or the load power factor is low, the combined switch should be used with reduced capacity, otherwise the service life of the switch will be affected.
(3) When using, it should be noted that the number of conversions per hour of the combination switch generally does not exceed 15 to 20 times.
(4) Frequently check whether the switch fixing screws are loose, so as not to cause loose crimping of the wires, causing discharge, ignition, ablation or open circuit of the external connection points.
(5) When overhauling the combination switch, attention should be paid to checking the contact condition of the dynamic and static contacts inside the switch to avoid arcing and ablation of the internal contacts.

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