Snap Action, Limit Switches

Image Part Number Description / PDF Quantity Rfq
608.3000.296

608.3000.296

Altech Corporation

LIMIT SWITCH IN65-U1Z AHSGU RO51

0

51.415R

51.415R

Altech Corporation

FOOT SWITCHFL1SU2SSTDCLR 2NO/2NC

0

602.1139.106

602.1139.106

Altech Corporation

LIMIT SWITCH METAL BODY GC-U1 AF

0

51.022B

51.022B

Altech Corporation

FOOT SWITCHPCFS-3MBLACK 1NOMOM 2

107

607.3200.009

607.3200.009

Altech Corporation

ASI SWITCH ASI SRM-LU-175

0

608.6187.042

608.6187.042

Altech Corporation

LIMIT SWITCH I88-SU1 AD

0

607.3200.008

607.3200.008

Altech Corporation

ASI SWITCH ASI SRM-QF-300

0

608.3000.257

608.3000.257

Altech Corporation

LIMIT SWITCH IN65-A2Z DGKK

0

609.2171.024

609.2171.024

Altech Corporation

LIMIT SWITCH WITH CABLE GC-SU1Z

0

601.8119.061

601.8119.061

Altech Corporation

SAFETY SWITCH LATCH -F-UC-55-R2-

0

51.655R

51.655R

Altech Corporation

FOOT SWITCHFM1SU1RF1UBKREDGD SPD

0

616.2000.718

616.2000.718

Altech Corporation

FOOT SWITCH DOUBLEPEDAL F2-SU1ZU

0

51.062OR

51.062OR

Altech Corporation

FOOT SWITCHPCFS-3M+GDBLACK/ORANG

0

604.1171.164

604.1171.164

Altech Corporation

LIMIT SWITCH METAL BODY D-SU1 HW

2

51.155R

51.155R

Altech Corporation

FOOT SWITCHFS1SU1USTDCLRGD 1NO/1

0

601.0853.004

601.0853.004

Altech Corporation

LIMIT SWITCH REMOTE RESET SGS-SA

0

608.3000.291

608.3000.291

Altech Corporation

LIMIT SWITCH IN65-E2 M12

9

51.455R

51.455R

Altech Corporation

FOOT SWITCHFL1SU1USTDCLRGD 1NO/1

0

609.2171.025

609.2171.025

Altech Corporation

LIMIT SWITCH WITH CABLE GC-SU1Z

0

608.6803.013

608.6803.013

Altech Corporation

LIMIT SWITCH I88-A2Z W

10

Snap Action, Limit Switches

1. Overview

Snap-action switches and limit switches are critical electromechanical components that enable precise control of electrical circuits through mechanical motion. Snap-action switches feature a rapid-acting contact mechanism that ensures quick response to positional changes, while limit switches specifically detect the presence or absence of objects at predefined positions. These devices are fundamental in automation systems, safety circuits, and equipment interlocking, providing reliable feedback for process control and machine protection.

2. Main Types and Functional Classification

TypeFunctional FeaturesApplication Examples
Standard Snap-Action SwitchFast contact actuation, compact size, tactile feedbackAppliances, control panels
Heavy-Duty Limit SwitchMetal housing, high mechanical enduranceIndustrial machinery, conveyor systems
Sealed Snap SwitchIP67-rated enclosure, resistant to dust/moistureOutdoor equipment, washdown environments
Miniature Snap SwitchSub-10mm dimensions, low operating forceMedical devices, IoT sensors

3. Structure and Components

Typical construction includes: - Actuator Mechanism: Lever, plunger, or roller assembly for motion detection - Contact System: Silver alloy contacts with snap-action spring for rapid switching - Housing: Thermoplastic (UL94 V-0) or metal enclosure with mounting features - Terminal Options: Quick-connect terminals, PCB pins, or screw terminals - Environmental Seals: Optional EPDM gaskets or molded-in sealing lips

4. Key Technical Parameters

ParameterTypical RangeImportance
Rated Current0.1-15ADetermines load capacity and contact lifespan
Operating Voltage12-600VAC/DCAffects insulation requirements and arcing resistance
Mechanical Life10 -10 operationsIndicates durability under non-load conditions
Electrical Life10 -10 operationsMeasures contact longevity under rated load
Actuation Force0.5-20NAffects sensitivity and mechanical interface design
Response Time1-10msCritical for high-speed automation applications

5. Application Fields

  • Industrial Automation: CNC machine tool positioning, robotic end-effectors
  • Building Systems: HVAC damper control, automatic door systems
  • Medical Equipment: Diagnostic analyzers, infusion pump occlusion detection
  • Consumer Electronics: Smart home devices, gaming console controllers
  • Transportation: Elevator door safety systems, railcar detection

6. Leading Manufacturers and Products

ManufacturerProduct SeriesKey Features
OmronD4MC SeriesIP67 rating, 10 mechanical operations
TE ConnectivityMicro Switch TL SeriesUL-certified, 15A rating
ABBPLS SeriesAdjustable actuator, explosion-proof design
OMRONZ-15 Series0.1A low-current switching capability

7. Selection Guidelines

Key considerations include: - Environmental conditions (temperature range, presence of contaminants) - Actuation force requirements vs. mechanical interface limitations - Contact configuration (SPDT/DPDT) and circuit requirements - Certification needs (UL, CSA, CE marks) - Mounting constraints (panel cutout dimensions) Example: For an automatic door system, specify a sealed IP65 switch with 10A/250VAC rating and lever actuator to ensure reliable operation in dusty environments.

8. Industry Trends

Current development directions include: - Integration with IoT systems through embedded sensing and wireless communication - Miniaturization for wearable and portable device applications - Enhanced material science for extended lifespan in harsh environments - Development of hybrid switches combining snap-action with proximity sensing - Increased focus on RoHS-compliant and recyclable materials - Smart diagnostics capabilities with condition monitoring sensors

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