Editorial Technical Reference

Limit Switch/Sensor

This page explains how Limit Switch/Sensor is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A safety and control device that detects the presence or position of a tray within a mechanism and triggers an action when a predetermined limit is reached.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Limit Switch/Sensor

Definition
In a tray mechanism, the limit switch/sensor is a critical component that monitors the tray's movement and position. It ensures the tray stops at precise locations, prevents over-travel that could cause jams or damage, and provides feedback to the control system about the tray's status. This device is essential for automated tray handling systems where repeatable positioning is required. The limit switch/sensor is typically mounted at fixed points along the tray's path. When the tray reaches a predetermined position, the device sends an electrical signal to the control system, which then stops the motor, changes direction, or initiates the next operation. This prevents mechanical damage and ensures accurate positioning. The device can be either a mechanical limit switch, which uses physical contact with a lever or roller, or a proximity sensor, which detects the tray without contact using electromagnetic fields. Both types are available in various configurations to suit different mounting and actuation requirements. The housing is typically made of plastic or aluminum alloy, and the actuator is metal. The electrical contacts are rated for control circuits, typically 24 V DC, with current ratings from 0.1 to 5 A depending on load type. Mechanical life ranges from 10^6 to 10^7 operations, and electrical life from 5×10^5 to 10^6 operations at rated load. Contact resistance is ≤25 mΩ initially, insulation resistance ≥100 MΩ at 500 V DC, and dielectric strength 1000–2500 V AC for 1 minute. Operating temperature range is -25 to 70 °C, with extended ranges available. Degree of protection is IP54 to IP67, depending on the model. Actuation speed should be 0.1 to 1.0 m/s for reliable operation, and repeat accuracy is ±0.05 mm for precision types. Weight ranges from 0.1 to 0.5 kg. These values are reference ranges; verify model-specific specifications with the manufacturer.
Working Principle
The limit switch/sensor operates by detecting physical contact (mechanical limit switch) or proximity (proximity sensor) with the tray. When the tray reaches the predetermined position, it either physically actuates a lever/roller (mechanical) or interrupts/triggers an electromagnetic field (proximity), sending an electrical signal to the control system to stop movement, change direction, or initiate the next operation.
Common Materials
Plastic housing, Metal actuator/lever, Electrical contacts/wiring
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Operating Voltage24 ±10% V DCStandard control circuit voltageIEC 60947-5-1
Rated Operating Current0.1–5 ADepends on load type (AC/DC)IEC 60947-5-1
Mechanical Life10^6–10^7 operationsHigher for roller lever typesIEC 60947-5-1
Electrical Life5×10^5–10^6 operationsAt rated loadIEC 60947-5-1
Contact Resistance≤25 Initial value, new conditionIEC 60947-5-1
Insulation Resistance≥100 At 500 V DCIEC 60947-5-1
Dielectric Strength1000–2500 V ACFor 1 minuteIEC 60947-5-1
Operating Temperature Range-25–70 °CExtended ranges availableIEC 60947-5-1
Degree of ProtectionIP54–IP67IP67 for washdownIEC 60529
Actuation Speed0.1–1.0 m/sMax. for reliable operation
Repeat Accuracy±0.05 mmFor precision limit switches
Housing MaterialAluminum alloy / PlasticPlastic for corrosion resistance
Weight0.1–0.5 kgDepends on housing and actuator

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Actuator/Lever
    Physical interface that makes contact with the moving tray to trigger the switch
    Material: Stainless steel or plastic
  • Switch Body/Housing Part
    Protects internal electrical components and provides mounting points
    Material: Plastic or metal
  • Electrical Contacts Part
    Open or close the circuit when the switch is actuated
    Material: Silver alloy or gold-plated
  • Terminal Block
    Connection points for wiring to the control system
    Material: Plastic with brass terminals
  • Proximity Sensor Optional
    Detects the tray without contact by disturbing an electromagnetic field.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Limit Switch/Sensor.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 10 bar
other spec: IP67 ingress protection, 10 million mechanical cycles
temperature: -20°C to +85°C
Media Compatibility
✓ Plastic trays ✓ Metal components ✓ Packaging materials
Unsuitable: High-vibration environments with >5g acceleration
Sizing Data Required
  • Tray dimensions and material
  • Required actuation force (N)
  • Response time requirement (ms)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Contact Contamination
Cause: Accumulation of dust, moisture, or chemical residues on electrical contacts, leading to poor conductivity or false signals.
Mechanical Wear/Fatigue
Cause: Repeated actuation cycles causing physical degradation of the actuator arm, spring, or housing, resulting in misalignment or failure to trigger.
Maintenance Indicators
  • Inconsistent or erratic operation (e.g., intermittent signals, false triggers)
  • Visible damage or corrosion on the housing, actuator, or wiring connections
Engineering Tips
  • Implement regular cleaning and inspection schedules, using appropriate methods (e.g., compressed air, contact cleaners) to prevent contamination buildup.
  • Ensure proper alignment and mounting during installation to minimize mechanical stress, and consider using protective enclosures in harsh environments.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 13849-1: Safety of machinery - Safety-related parts of control systems ANSI/UL 508: Industrial Control Equipment DIN EN 60947-5-1: Low-voltage switchgear and controlgear - Control circuit devices and switching elements

Quoted from the published standard.

Manufacturing Precision
  • Actuation point repeatability: +/-0.1mm
  • Enclosure sealing flatness: 0.05mm
Quality Inspection
  • IP (Ingress Protection) rating test per IEC 60529
  • Electrical endurance test (minimum 1 million cycles)

Manufacturers of Limit Switch/Sensor

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Andeli Group Co., Ltd.
Shanghai, CN
Founded 19853000 + staff235,000 m²
Listed on the company's own website · profile compiled by CNFX from public sources
BCST Group
Shanghai, CN
Listed on the company's own website · profile compiled by CNFX from public sources
ETEK Microelectronics
Jiangsu, CN
ISO 26262
Listed on the company's own website · profile compiled by CNFX from public sources
CNC Electric
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Eurocrane (China) Co., Ltd.
Jiangsu, CN
Also makes: Jib Crane, Overhead Crane, Remote Control and 3 more
Listed on the company's own website · profile compiled by CNFX from public sources
Hearken Flow
Tianjin, CN
Also makes: Butterfly Valve, Ball Valve, Pneumatic Actuator and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
HEYUE Valve Actuator
Zhejiang, CN
Also makes: Butterfly Valve, Ball Valve, Pneumatic Actuator and 7 more
Listed on the company's own website · profile compiled by CNFX from public sources
Kanede Controls
Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Nanjing KJT Electric Co,. LTD.
Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
NUODUN Linear
Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Yueqing Yumo Electric Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
YUEQING YUMO ELECTRIC CO.,LTD
Zhejiang, CN
Also makes: Check Valve, Diaphragm Valve, Butterfly Valve and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
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Frequently Asked Questions

What is the typical rated operating voltage for this limit switch/sensor?

The standard control circuit voltage is 24 V DC with a tolerance of ±10%, as per IEC 60947-5-1. Always verify the exact rating for your specific model.

What is the mechanical life of this device?

Mechanical life is typically 10^6 to 10^7 operations, depending on the actuator type (roller lever types have higher life). This is a reference range; confirm with the manufacturer.

What degree of protection is available?

The degree of protection ranges from IP54 to IP67, with IP67 suitable for washdown environments. Verify the specific rating for your model.

How do I verify the dielectric strength?

Dielectric strength is tested at 1000–2500 V AC for 1 minute, as per IEC 60947-5-1. Ensure your application does not exceed the rated voltage.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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