MTL4021 Hazardous Area Switch | Zone 0 Solenoid

MTL4021 Hazardous Area Controller: Safe On/Off Switching for Explosive Environments

Smart Hazardous Zone Control

The MTL4021 lets you safely operate solenoids, alarms and LEDs in explosive areas (Zone 0/Div.1). Control devices using simple volt-free contacts or logic signals from safe areas. Add safety overrides and earth fault detection.

Technical Performance

• Model: MTL4021 (single-channel)
• Output power: 25.5V max / 110mA
• Response time: <100ms (to 90% final value)
• Signal ripple: <0.5% peak-to-peak
• Control voltage:
  • ON: <1.4V (Terminals 10-11)
  • OFF: >4.5V (Terminals 10-11)
• Power consumption: 100mA@24V DC
• Isolation: 250V AC between zones

Wiring Guide

• Power: Terminal 14 (+ve), 13 (-ve)
• Control: Terminal 10 (+ve), 11 (-ve)
• Override: Terminal 9 (+ve), 8 (-ve)
• Output: Terminal 1 (+ve), 4 (-ve)
• Earth detection: Connect MTL4220 to Terminal 6

Safety Logic

• Output ONLY active when: Control=ON AND Override=OFF
• Override=ON forces output OFF immediately

Certifications

• ATEX/IECEx: Zone 0, IIC, T4-T6
• FM: Div.1, Group A
• Entity: Voc=25.5V, Isc=110mA

Package & Support

• 1× MTL4021 unit
• Installation sheet
• 12-month warranty
• Global shipping: FedEx/UPS/DHL

Expert FAQs

• Q: Can I chain multiple units?
  A: Yes – each MTL4021 operates independently
• Q: What’s the max override response time?
  A: Instant cut-off (<10ms) when activated
• Q: Does it work with 120V AC inputs?
  A: No – control inputs must be <30V DC
• Q: Can I monitor output status remotely?
  A: Yes – amber LED correlates with output state
• Q: Is external cooling required?
  A: No – max 1.9W dissipation at 35°C

Alternative Solutions

• MTL4042: Power isolator without switching controls
• MTL4044D: Analog isolator (no digital on/off)