Does the size of microswitch affect its performance?
Release time：2018-11-23 Clicks： Click
Does the size of the micro switch matter? What impact does it have on performance? Here is a detailed introduction to you.
The size of Dongguan micro switch is very important. Switch size is directly related to its characteristics, including current range, stroke and operating force. For example, one of the smaller micro-switch manufacturers currently has a size of 0.50 inches x 0.236 inches x 0.197 inches (LxWxH). Although this tiny switch is suitable for detecting circuit states in compact circuit breakers, it usually cuts off only 0.1 to 3 amperes (A) of current and has a shorter trip.
Large switches are usually required for applications requiring larger currents. For example, in the application of fuel tank, the micro-switch used to detect liquid level needs to be able to provide large stroke and withstand large current. Usually in the application of liquid level switch, the switch should drive the pump directly and carry a large current. This requires a large microswitch with rated current of 20A or 25A at 125VAC or 250VAC voltage.
Tip: The smaller the size of the micro-switch, the smaller the stroke and the current that can be interrupted.
In addition, the size of the miniature micro-switch also affects the operation force. Ideally, engineers need a switch with low operating power and high current capacity. But in fact there needs to be a compromise between the two parameters. In order to maintain good contact while providing a large current bearing range, the micro switch needs stronger spring, which will make the operation force and shape size of the switch larger. Operating force ranges from 2 grams in pressurized pneumatic applications to 8 ounces in solenoid valve applications (requiring greater operating force). One of the larger switches on the market is 1.94 inches x 0.69 inches x 1.3 inches (LxWxH).
Small micro switch engineers should also pay attention to the differential stroke of the switch - the distance between the switch tripping position and the reset position. Its threshold varies according to different applications. For example, in the application of temperature switches, the on/off operating point should be as close as possible and the differential stroke should be as low as 0.0001 inches. However, in the application of liquid level pump, too close differential stroke may lead to too frequent start-up and shutdown of the water supply pump, shortening the service life of the pump.