12HM8

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Snap Action, Limit Switches – 12HM8 Application Field and Working Principle

Snap action switch, also known as a limit switch, is an electrical switch device with a spring-loaded actuator, designed to be triggered either by a mechanical object or electronic signal. The 12HM8 is a type of snap action switch manufactured by German-based electronics company Hartman Electronic GmbH & Co. KG, and is used in a wide array of applications, from commercial HVAC units and traffic lights, to industrial machinery and robotic movements. The 12HM8 is best known for its versatility, capability, and reliability, making it an ideal and economical choice for almost any type of application where a snap action switch is required. This document provides an overview of the 12HM8 applications and working principles.

Application Field

The 12HM8 snap action switch is primarily used in a variety of industrial applications, such as when controlling and switching power on industrial robots, controlling airflow in HVAC systems, and regulating the speed and direction of motors. This type of switch is also used in industrial equipment such as photocopiers, elevators, and printing machines. The 12HM8 is commonly used in safety applications, such as controlling access to hazardous areas, and provides a reliable safety switch solution for applications where contact with dangerous moving parts needs to be avoided or controlled. In addition, the 12HM8 is suitable for applications where short and recurring contact cycles are needed, as its snap action switch operations provide a good solution for power switching in time cycles.

Working Principle

A snap action switch is typically composed of three essential parts: the actuator or plunger, the switch body, and the return spring. The externally actuated plunger is the part responsible for moving the electrical contact on the switch body. This contact is usually manufactured from durable materials such as brass or silver, and is resiliently connected to a return spring inside the switch. When the actuator is depressed, the contact is enegized, allowing a current to pass through the switch, thus allowing a desired circuit to be complete. When the actuator is released, the contact is returned to its original position, breaking the circuit and stopping the current flow. The 12HM8 features a micro switch design, characterized by very low travel distance and fast response time. It uses gold-plated contacts for maximum efficiency and electrical conductivity, and offers a switching current up to 10A, at up to 250VAC voltage.

Conclusion

The 12HM8 snap action switch offers a reliable and economical solution for a wide range of applications. It is a versatile and efficient switch that provides accurate control over circuits and motors, making it an ideal choice for industrial, commercial, and safety applications. As such, it is an essential component when it comes to power switching and circuit control.

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