Snap Action, Limit Switches

Image Part Number Description / PDF Quantity Rfq
51.906B

51.906B

Altech Corporation

FOOT SWITCH DPDT MOM 2MCAIP43

0

613.3385.005

613.3385.005

Altech Corporation

LIMIT SWITCH SN2-SU1Z AH 180GR

0

607.3200.061

607.3200.061

Altech Corporation

ASI SWITCH ASI CSMS-S

0

51.471R

51.471R

Altech Corporation

FOOT SWITCHFL1SU1P2LUSTDCLRGD 2K

0

608.8186.034

608.8186.034

Altech Corporation

LIMIT SWITCHPLASTIC BODY TI2-SU1

2

608.3000.285

608.3000.285

Altech Corporation

LIMIT SWITCH IN65-UV1 AVK

0

609.6198.014

609.6198.014

Altech Corporation

FOOT SWITCH EX F1-SU1 EX-5M

0

51.291R

51.291R

Altech Corporation

FS2S2DU1/S1DO1VUSTDCLRGD 2STGSLO

0

51.603G

51.603G

Altech Corporation

FOOT SWITCHFM1SU1F2GY SPDTMOM2MC

0

51.298R

51.298R

Altech Corporation

FS2 S2DO2V(2X) USTDCLRGD SAFETYS

0

612.1140.748

612.1140.748

Altech Corporation

LIMIT SWITCH METAL BODY GC-U1 FF

0

608.3000.277

608.3000.277

Altech Corporation

LIMIT SWITCH IN65-UV1Z M20

22

612.1890.967

612.1890.967

Altech Corporation

LIMIT SWITCH METAL BODY GC-SA2 F

0

609.7185.082

609.7185.082

Altech Corporation

LIMIT SWITCH WITH CABLE ENM2-SU1

0

51.613G

51.613G

Altech Corporation

FOOT SWITCHFM1SU1DSU1L1GY 2XSPDT

0

606.1000.564

606.1000.564

Altech Corporation

FOOT SWITCH F1-ZSP1D UN

1

51.154R

51.154R

Altech Corporation

FOOT SWITCHFS1U1RSUSTDCLRGD 1NO/

0

608.6821.099

608.6821.099

Altech Corporation

LIMIT SWITCHPLASTIC BODY I88-A2Z

0

608.6167.018

608.6167.018

Altech Corporation

LIMIT SWITCHPLASTIC BODY I88-SU1

2

618.6835.067

618.6835.067

Altech Corporation

LIMIT SWITCHPLASTIC BODY I88-A2Z

0

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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