1、 Types of blade switches

Basic structure

Micro Switch is a fast acting switch that uses small mechanical displacements to turn on and off circuits, named after its internal spring like blades

The core structure includes: shell made of ABS, nylon or metal material, providing mechanical protection and environmental isolation

Contact system: Dynamic and static contact group, responsible for current switching function

Drive mechanism: levers/buttons and other operating components

Spring system: provides reset force and critical point of action

Terminal: Electrical connection interface (welded/screw/plug-in)

2. Classify by driving method

Direct acting: direct pressing operation, simple structure.

Ball bearing type: Built in ball bearings reduce friction and extend lifespan.

Hinge type: lever principle amplifies operating force, suitable for precision control.

3. Classified by installation method

Panel installation: Fixed to the equipment panel and requires openings.

PCB installation: Pin soldering on the circuit board to save space.

Rail installation: quick installation/disassembly in industrial cabinets.

4. Classified by material and environmental adaptability

Waterproof and dustproof type: IP67/IP68 protection, suitable for outdoor or humid environments.

Explosion proof type: Complies with ATEX standards and is used in flammable and explosive places.

High temperature type: resistant to temperatures above 150 ° C, made of ceramics or special plastics.

5. Special function types

Type with indicator light: Integrated LED, displaying switch status.

Self locking type: Maintain the switch state until it is operated again.

Delay type: Built in timing module, delayed on/off.

2、 Detailed explanation of core parameters

1. Electrical parameters

Rated voltage/current: AC 250V/10A, DC 30V/5A, etc., starting current (such as motor load) needs to be considered.

Contact resistance: as low as 10m Ω or less, silver alloy contacts have better performance.

Insulation resistance:>100M Ω (tested at 500VDC) to prevent leakage.

Pressure resistance strength: 1500VAC/1 minute, ensuring high voltage isolation.

Frequency response: High frequency applications (such as communication equipment) require a switching rate of>1kHz.

2. Mechanical parameters

Operating power: 50g~500g, tactile design affects user experience.

Travel: 0.5mm~3mm, short travel is suitable for quick response.

Mechanical lifespan: 100000 to 10 million cycles, gold-plated contacts enhance durability.

Protection level: IP level (such as IP67) defines dust and water resistance.

Temperature range: -40 ° C to+125 ° C, military grade requires a wider range.

3. Environmental parameters

Chemical corrosion resistance: resistant to acid, alkali, and salt spray (in accordance with ASTM B117 standard).

Anti vibration: 5-2000Hz frequency band, acceleration 15G test.

Impact resistance: 100G peak, lasting for 11ms.

3、 In depth analysis of electrical performance

1. Switching ability and load type

Resistive load: easiest to control, no surge current.

Inductive loads (such as motors): To suppress the back electromotive force, it is recommended to parallel RC circuits.

Capacitive load (such as power supply): prevents inrush current from damaging contacts, pre charging design.

2. Arc management technology

Magnetic blow out arc: using a magnetic field to elongate the arc and accelerate cooling.

Sealed packaging: Inert gas (such as nitrogen) reduces oxidation and arcing.

Ceramic arc extinguishing chamber: high temperature resistance, isolated arc energy.

3. Signal integrity

Low noise design: Gold plated contacts reduce contact jitter, with a focus on high-frequency signals.

Shielding structure: The metal casing prevents electromagnetic interference (EMI).

4、 Advanced analysis of mechanical performance

1. Application of Materials Science

Contact material: Silver tin oxide (AgSnO ₂) has better arc resistance than pure silver.

Shell material: PBT plastic is heat-resistant, and fiberglass reinforcement enhances strength.

Spring element: Stainless steel 301 provides long-lasting elasticity.

2. Life testing standards

IEC 61058: Specification for testing the lifespan of household appliance switches.

UL 1054: North American Commercial Switch Certification Standard.

Accelerated aging test: Simulate long-term use in high temperature and high humidity environments.

3. Ergonomic design

Touch feedback: Segmented operating force curve enhances tactile sensation.

Sound control: decibel limit (e.g.<50dB) to avoid noise pollution.

5、 Expansion of application areas

1. Automotive electronics

Steering wheel control: high shock resistance, working at -40 ° C~85 ° C.

Charging gun locking: IP69K protection, high voltage DC load capacity.

2. Medical equipment

Surgical instruments: Aseptic packaging, low contact resistance to prevent heating.

Imaging equipment: EMI shielding to avoid interference with precision sensors.

3. Aerospace

Cabin control: Complies with MIL-STD-810G vibration standard.

Satellite equipment: radiation resistant materials, vacuum environment adaptability.

6、 Additional Selection Guide

1. Size and space adaptation

Miniaturization: SMD packaging is used for compact electronic products.

Customized appearance: The irregular structure is adapted to the layout of special equipment.

2. Compliance certification

UL/CE: Basic Security Certification.

RoHS/REACH: No harmful substances, in compliance with environmental regulations.