The ATEX Key Switch is a:

• Explosion-proof industrial control station
• Designed for manual control of doors, motors, or machinery
• Used in ATEX hazardous environments

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Functional Description

Core Function

• Provides manual control input (momentary switching )
• Sends electrical signal to:
  • Door controller (e.g. Marantec ATEX CS320 series)
  • Motor control system
  • Industrial automation panel

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ATEX Explosion Protection

Certification Marking

From Marantec ATEX documentation:

• Ex II 2G Ex ed IIC T6
• Ex II 2D Ex tD A21 IP66 T80°C

Meaning (decoded)

• II 2G / 2D → Suitable for Zone 1 & 2 (gas) and Zone 21 & 22 (dust)
• Ex ed → Combination of:
  • Ex e (increased safety)
  • Ex d (flameproof parts)
• IIC → Highest gas group (hydrogen, acetylene)
• T6 → Max surface temp ≤ 85°C
• IP66 → Dust-tight + strong water jet protection

 This is high-level industrial explosion protection

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Construction & Materials

Housing

• Glass-fibre reinforced polyester resin
• Anti-static, impact-resistant

Sealing

• PU foam gasket (industrial sealing)

Design

• Surface-mounted enclosure
• Front push-button actuator
• Industrial cable entry (ATEX glands)

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Electrical Specifications

Rated Electrical Values

• Voltage: up to 400V AC
• Switching current: 6 A

Contact Type

• Typically:
  • NO (Normally Open) or
  • NC (Normally Closed)
• Configurable depending on application

Wiring

• Screw terminals inside enclosure
• ATEX-certified cable glands

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Physical Specifications

From MFZ ATEX datasheet:

• Height: 93 mm
• Width: 80 mm
• Depth: 72 mm
• Weight: ~400 g

Compact but rugged industrial design

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Environmental Specifications

• Temperature range: −20°C to +40°C
• Protection class: IP66
• Resistant to:
  • Dust
  • Moisture
  • Chemicals
  • Industrial vibration

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Typical Applications

Used in explosion-risk environments, such as:

Industries

• Oil & gas plants
• Chemical processing
• Grain silos (dust explosion risk)
• Paint and solvent facilities
• Pharmaceutical production

Door & Automation Use

• ATEX industrial doors
• Roller shutters in hazardous zones
• Explosion-proof motor control stations

 Often paired with:

• ATEX motors
• ATEX control panels
• Marantec explosion-proof operators

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System Integration

Typical Control Chain

Key Switch  → Controller → Motor → Door

The EX Taster acts as:

• Primary manual input device
• Safety-compliant human interface in hazardous zones

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Critical Engineering Notes

Not a Standard Control Station

You cannot replace it with a normal switch because:

• Must prevent sparks
• Must limit surface temperature
• Must meet ATEX certification

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Installation Requirements

• Must use:
  • ATEX cable glands
  • Proper grounding (anti-static protection)
• Installed by certified personnel

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Contact Protection

• Contacts are designed to:
  • Avoid arcing
  • Maintain safe switching in explosive atmospheres

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Example Technical Summary

• Zones: 1, 2, 21, 22
• Voltage: up to 400V AC
• Current: 6 A
• Protection: IP66
• Temp class: T6
• Housing: Glass-fibre reinforced polyester
• Size: 93 × 80 × 72 mm