Snap Action, Limit Switches

Image Part Number Description / PDF Quantity Rfq
609.7185.085

609.7185.085

Altech Corporation

LIMIT SWITCH WITH CABLE ENM2-SU1

0

601.9261.017

601.9261.017

Altech Corporation

SWITCH SAFETY HINGE SHS-A1Z-SA-B

0

603.3385.018

603.3385.018

Altech Corporation

LIMIT SWITCH METAL BODY SN2-SU1Z

0

51.209R

51.209R

Altech Corporation

FOOT SWITCHFS2U2(2X)STDCLR 2NO/2

0

610.6050.196

610.6050.196

Altech Corporation

LIMIT SWITCH C74-RAST-SU1Z VS C2

4

606.1600.010

606.1600.010

Altech Corporation

FOOTSWITCH F1-U1ZD UN

0

608.7367.005

608.7367.005

Altech Corporation

LIMIT SWITCH ENM2-SU1Z RIW

0

51.402R

51.402R

Altech Corporation

FOOT SWITCHFL1U1RSTDCLR 1NO/1NCS

0

612.1187.567

612.1187.567

Altech Corporation

LIMIT SWITCH METAL BODY GC-SU1 A

0

AP-HCM02

AP-HCM02

Altech Corporation

AUX SWITCH - MINI CONTACTOR C12N

10

608.3000.309

608.3000.309

Altech Corporation

LIMIT SWITCH IN65-SE2 AHDM

0

51.472R

51.472R

Altech Corporation

FOOT SWITCHFL1SU1P02LUSTDCLRGD 2

0

51.654R

51.654R

Altech Corporation

FOOT SWITCHFM1SU1RL1UBKREDGD SPD

0

601.8119.046

601.8119.046

Altech Corporation

SAFETY SWITCH LATCH -F

1

618.8185.018

618.8185.018

Altech Corporation

LIMIT SWITCHPLASTIC BODY TI2-SU1

1

51.370R

51.370R

Altech Corporation

FS3SU1/U1/SU1U ALUMINUMPEDALS ST

0

608.3000.286

608.3000.286

Altech Corporation

LIMIT SWITCH IN65-SA2 AVK

12

606.2610.047

606.2610.047

Altech Corporation

FOOTSWITCH F2-U1Y/U1Z UN

0

604.1318.140

604.1318.140

Altech Corporation

LIMIT SWITCH METAL BODY D-UV1Z R

0

608.3000.219

608.3000.219

Altech Corporation

LIMIT SWITCH IN65-E2 RK

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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