2-Point Detection Explosion-Proof Limit Switches Model: VCX-7_0_

Azbil Model VCX-7_0_ 2-Point Detection Explosion-Proof Switches are compact vertical gas/steam explosion-proof limit switches for outdoor use, with 2-point detection and pressure-resistant and increased-safety structure, conforming to IEC standards, and usable in a hydrogen gas atmosphere. ATEX (Europe), TIIS (Japan), NEPSI (China), KOSHA (Korea), CNS (Taiwan), IECEx, NK (shipping) certified models are available. These switches have a light-weight and robust die-cast cover made of aluminum alloy. A die-cast surface with rust prevention treatment and a baked finish offers excellent corrosion resistance and weather resistance. Corrosion-resistant models made of die-cast anti-corrosive aluminum are also available. Center-neutral type and simultaneous operation type models are available. With the center-neutral type, a single limit switch can detect two limit points (valve upper and lower limits) since two different internal switches operate depending on the direction of the actuator rotation.




Key Features

Compact Design Vertical gas/steam explosion-proof limit switch for outdoor use with 2-point detection
Hydrogen Safe Usable in hydrogen gas atmosphere
Dual Detection Single switch detects two limit points (valve upper and lower limits)
Durable Construction Lightweight, robust die-cast aluminum alloy case with corrosion-resistant finish
Weather Resistant IP67 protection rating, suitable for harsh outdoor environments
Multiple Certifications KEMA (Europe), TIIS (Japan), NEPSI (China), KOSHA (Korea)
ATEX (Europe)
IECEx
TIIS (Japan)
NEPSI (China)
KOSHA (Korea)
NK (Shipping)
CNS (Taiwan)

Classification: Ex d e II C T6 | Group II C T6 | Zone 1 and Zone 2 hazardous areas

Electrical Performance

Parameter Specification
Contact Form Single-pole double-throw (SPDT) × 2
Electrical Rating (Silver) 5A at 250 Vac, 0.4A at 125 Vdc, 0.2A at 250 Vdc
Electrical Rating (Gold-alloy) 0.1A at 125 Vac, 0.1A at 30 Vdc
Contact Material Silver alloy (rivet) or Gold-alloy (cross-point)
Dielectric Strength 2,000 Vac for 1 minute (between terminals and ground)
Insulation Resistance Min. 100 MΩ (by 500 Vdc megger)

Mechanical Performance

Parameter Specification
Operating Speed 0.3 mm/s to 0.5 m/s
Operating Frequency Max. 120 operations/minute
Mechanical Life Min. 2 million operations
Electrical Life (Silver) Min. 30,000 operations at rated load
Electrical Life (Gold-alloy) Min. 2 million operations at rated load
Impact Resistance 200 m/s², contacts open for 1 ms max.
Vibration Resistance 1.5 mm peak-to-peak, 10-55 Hz, 2 hours

Environmental Specifications

Parameter Specification
Operating Temperature -10 to +60°C (no freezing allowed)
Operating Humidity 45-85% RH
Storage Temperature -10 to +60°C
Storage Humidity Max. 98% RH (with conduit plug inserted)
Protection Rating IP67 (IEC 60529, JIS C 0920)

Operation Types

  • Center-neutral type
  • Simultaneous operation type

Actuator Options

  • Standard roller lever
  • Adjustable roller lever
  • No lever

Cable Lead-in

  • G3/4 increased-safety packing
  • Cable Gland M25

Materials

  • Aluminum alloy housing
  • Stainless steel screws
  • Anti-corrosion models available
Ideal For: Valve position monitoring, hazardous area limit switching, outdoor industrial applications, petrochemical facilities, oil & gas operations, Zone 1 and Zone 2 hazardous environments
  • Do not wire while power is connected - Risk of electrical shock
  • Never operate with cover or conduit open - May lead to explosion
  • Use only in appropriate explosion-proof rated areas - Must match facility standards
  • Proper installation required - Improper tightening or wiring may impair explosion-proof performance
  • Do not use in strong acid/alkali environments - May damage protective coatings
  • Electric wires must withstand 70°C or higher - Required for TIIS certification
  • Replace entire unit if damaged - Only lever is user-replaceable

Model Coding Format: VCX-7[Operation Code][Actuator Code]-[Certification][Contact Material][Anti-corrosion]

Code Position Options
Operation Type 0 = Center-neutral | 1 = Simultaneous operation
Actuator 01 = Standard roller | 02 = No lever | 03 = Adjustable roller | 101 = Simultaneous standard roller | 102 = Simultaneous no lever | 103 = Simultaneous adjustable
Contact Material Blank = Silver alloy | K = Gold-alloy
Anti-Corrosion M = Anti-corrosion type (optional)

Note: Connectors and auxiliary actuators sold separately. Contact your Azbil representative for detailed specifications and ordering assistance.