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Limit Switch Box 510 Series Manufacturer

Limit Switch Box 510 Series

Limit Switch Box is a field instrument to detect the valve status in the automatic control system, which is used to switch the opening or closing position of the valve (the signal output of the contact is accepted by the program controller or the computer search sample, and then execute the next procedure after confirmation. The product can also be used as an important valve interlock protection and remote alarm indication in the automatic control system.


  • Die-cast Aluminum Shell: Utilized for enhanced product protection and explosion-proof capabilities.
  • Double-line Interface: Separates signal and power supply, enhancing system reliability and safety.
  • Explosion-proof Grade: Rated ExdIICT6/ExtdA21 T80°C IP66, suitable for hazardous gas and dust environments.
  • Position Indication: Provides precise and reliable valve position signals and indications for easy equipment status monitoring.
  • Easy Installation: Equipped with a NAMUR standard mounting bracket, enabling direct installation on pneumatic actuators for quick and convenient setup.

The APL-510N explosion-proof limit switch box is extensively utilized across diverse industrial sectors, including oil, gas, chemical, and power industries, owing to its versatile features.

Key Features and Characteristics

  • Enclosure: Weatherproof rated IP67/NEMA4, 4X, 7, 9 (Standard), with optional IP68.
  • Explosion-proof: Rated E EXd lIC T6, E EX iallC T6, E EX d llB T6.
  • Solid and compact design.
  • Dual shaft holder integrated into the cover for easy visual position indicator setup.
  • Unique threaded joint cover design for visual indicator placement.
  • Bolt-on visual position indicator.
  • Dual cable entries: Standard 2 x 3/4 PF, with optional M20, M25, NPT3/4″, PT3/4″.
  • Terminal Strips: 8 points (0.08-2.5mm2).
  • Switch type: Mechanical micro switch, customizable with Honeywell or P+F proximity micro switch. Ambient temperature: Standard: -20 to +80°C; Low temp.: -40 to +80°C.
  • Indicating switch: Open (yellow), Close (red).
  • Mounting bracket: Stainless steel bracket, adjustable. Life expectancy: 10 million turning cycles.

Main Paramaters

  • Die-cast aluminum housing with powder coating (Optional: SS316).
  • Visual position indicator secured with bolts.
  • Quick-set cam for swift adjustments.
  • Spring-loaded splined cam mechanism.
  • Eliminates need for readjustment after initial setup; tool-free adjustment.
  • Dual cable entries provided.
  • Captive cover bolts for added security.
  • Bolts remain in place when cover is opened, preventing loss.

Standard Specification


Model HVM-5 Series
Enclosure Weatherproof IP67/NEMA4&4X Explosionproof E EX d IIC T6
Cable entries Two NPT3/4″
Ambient temperature -20°C~80°C
Terminal strips 8 points (0.08-2.5mm²)
Position indicator 0~90° (90° turn free join) close: red open: yellow
Switches Mechanical switch x2 proximity sensor x2
Painting Chromate Polyester powder coating(black)

Optional Specification


Model HVM-25 Series
Enclosure Weatherproof IP67/NEMA4&4X Explosionproof E EX d IIC T6
Cable entries Two NPT3/4″ T3/4″
Option temperature
Terminal strips
Position indicator Three position close: red open: yellow
Switches Mechanical switch x2 proximity sensor x2
Potentiometer 1k ohm standard. 5k ohm. 0-10k ohm

We provide a variety of Limit Switch Box, if you have special needs, please contact us directly!

Limit Switch Box 510 (4)

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