Definition of micro switch

This article will introduce the representative of the detection switch - micro switch (Figure 1). The micro switch is classified as a detection switch according to the purpose, but is sometimes used as an operation switch. Microswitches include a wide range of products of varying sizes and are used in many devices.

Definition of micro switch

The Snap Action mechanism has a small contact spacing and a snap action mechanism, and covers a contact mechanism that performs a switching operation with a predetermined action and force, and has an external actuator and a small outer shape.

The quick acting mechanism refers to a mechanical mechanism that instantaneously switches the contact at a specific operating position regardless of the operating speed. The switch that uses this mechanism to operate with a predetermined action and force is a micro switch.

Characteristics

<Small size but can switch large current>

Under normal circumstances, when the electronic circuit is turned off, a spark called arc is generated between the contacts. The larger the current, the easier it is to generate an arc. The slower the speed of switching the contact, the longer the duration of the arc is, which is the factor that causes the contact to deteriorate. The quick-action mechanism of the micro-switch can instantly switch the contact point, so the arc duration is short, and the size is small, but it can be used for a circuit with a large current.

<High precision>

The micro switch can basically switch the contact at the same position even if the opening/closing operation is repeated repeatedly, so the position detection error is small, and it is suitable for applications requiring high precision. This is also a unique advantage of the micro switch with a snap action mechanism.

<Durability>

Since the duration of the arc is short, the damage to the joint is also small, so the durability is improved.

<Touch and sound>

The snap action mechanism has a unique touch and sound during operation, so the operation can be confirmed by tactile and audible.

species

The size of the micro switch is divided into four types: normal type, small size, ultra small size and extremely small size. Ordinary microswitches are used in large-scale industrial machinery and equipment, and small, ultra-small and ultra-small micro-switches are used in business equipment and home appliances.

It can also be classified according to environmental resistance. For example, it includes a type that has a sealing function (sealed type) and a type that does not have a type (normal type).


structure

The main components are (1) actuator unit, (2) snap mechanism unit, (3) contact unit, (4) terminal unit, and (5) outer casing.