Leading Manufacturer of Safety Interlock Switches and Machine Guard Safety Switch Devices for Automation and Process Safety

Explosion Proof Trapped Key Control Isolation Switch (M-ISB-CB-EX)

The M-ISB-CB-EX is the first stage in the Trapped Key Process and can be mounted externally. Turning the key opens the safety contacts, turning the CONTROL CIRCUIT OFF, allowing the key to be removed and transferred to the next stage in your Trapped Key System.

  • Body Material: Mirror Polished Die-Cast Metal
  • Ingress Protection: IP67
  • Contacts: 2-Pole or 4-Pole Ex Rated Contact Blocks
  • Zones: 1, 21, 2, 22
  • Ex Marking: Exd IIC T6 (-20 ≤ Ta ≤ +60C) Gb / Ex tb IIIC T85C (-20 ≤ Ta ≤ +60C) Db
Part NumberPart Description
M-ISB-CB-11-EXControl Switch Box 1NC 1NO EX with 3m Pre-wired Die Cast
M-ISB-CB-20-EXControl Switch Box 2NC EX with 3m Pre-wired Die Cast
M-ISB-CB-20-EX-15MControl Switch Box 2NC EX with **15m Pre-wired Die Cast
M-ISB-CB-22-EXControl Switch Box 2NC 2NO EX with 3m Pre-wired Die Cast

Important Note
Comes with 3m of pre-wired cable (longer available on request).
Key sold separately.

Technical Data
ApprovalsIECEx, cULus on LS-Ex Internal Contact Block
TechnologyTrapped Key Control Switch
Housing MaterialDie-Cast Aluminum
Operating Temperature-25 ... +80 °C
Enclosure ProtectionIP67
Mechanical Life (B10d)1,000,000 cycles
Switching frequency (LS-Ex) 1.0 Hz maximum
Mechanical Life Expectancy (LS-Ex) 1,000,000 switches
Electrical Life Expectancy (LS-Ex)Tested to 1,000,000 cycles at 24V. 0.2A

Ex Classification
ATEX Zones 1,21,2,22
II 2G Ex mb IIC T6 Gb
II 2D Ex mb IIIC T80C Db