Micro-switch knowledge, micro-switches

Micro-switch knowledge, micro-switches to explain the knowledge of micro-switches, micro-switches


(1) General terms

Micro-switch: A contact structure with a small contact spacing and a snap-action mechanism that performs a switching operation with a prescribed stroke and a prescribed force, covered with a housing, and a micro-switch having a drive rod externally. (hereinafter referred to as the switch)

There are contacts: in the switch type, compared with the semiconductor switch with switching characteristics, the function of the switch is realized by the mechanical switch of the contact.

Contact form: Electrical input/output circuit [shown in (11)] that forms a contact according to various purposes.

Rating: Generally refers to the value as a guarantee for the characteristics and performance of the switch, such as rated current, rated voltage, etc., provided that the specific conditions (type of load, current, voltage, frequency, etc.).

Resin fixing (plastic sealing terminal): A method in which the terminal portion is wired with a wire, and the portion is fixed by filling the resin to eliminate the exposed charged portion to improve the drip resistance.

Insulation resistance: refers to the resistance value between the non-connected terminals, between the terminals and the uncharged metal parts, between the terminals and the ground.

Withstand voltage: After adding a high voltage for 1 minute at the specified measurement site, it does not cause a critical value of insulation damage.

Contact resistance: indicates the resistance of the contact portion of the contact, but generally indicates the resistance value including the resistance of the spring and the conductor of the terminal portion.

Anti-vibration: When the micro-switch is used, the vibration-closed contact is in a vibration range that does not separate for more than a specified time.

Impact resistance: Durable impact means that the Micro Switch is not damaged by various parts caused by the mechanical impact during transportation or installation, and meets the impact within the range of operating characteristics.

Malfunction: It refers to the impact range of the contact that is closed by the impact when the micro switch is not used for more than the specified time.

(2) Terms about structure and structure
Structure and structure of micro switch

(3) Terms related to life
Mechanical life: The contact point is not energized, and the overtravel (OT) is set to the specification value at the specified operating frequency to make the switch life during operation.
Electrical life: The rated load is connected to the contact point, and the over-stroke (OT) is set to the specification value at the specified operating frequency to perform the switching life.

(4) Standard test status
The test conditions of the switch are as follows.
Ambient temperature: 20±2°C, relative humidity: 65±5%RH, air pressure: 101.3kPa

(5) N level reference value
Indicates the level of failure at 60% (λ60). Λ60=0.5×10-6/time means that the failure rate is 1/2,000,000 times at a reliability of 60%.

(6) The shape and type of the joint

Shape name
Main material used
processing method