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

External Mount Trapped Key Control Isolation Switch with Solenoid Controlled Key Release (M-ISB4-SR)

The M-ISB4-SR is used for isolating an electrical control circuit. The key is solenoid controlled and requires an unlock sign before the key can be turned to the OFF position, allowing it to be removed and transferred to the next stage in the Trapped Key System. The ISB4-SR is housed in a robust die-cast aluminum enclosure for external mounting.

  • Mirror Polished Die-Cast Metal
  • Ingress Protection up to IP67
  • 2NC + 2NO, 3NC + 1NO Monitoring Contact Blocks
  • Indication via LED 1 Solenoid Status Indication / LED 2 is an Optional Auxiliary Indication Circuit
  • Connection via 3 x M20 or ½” NPT Conduits
Part No.Part Description
M-ISB4-SR-22Control Switch Solenoid Release, 2NC 2NO (M20)
M-ISB4-SR-31Control Switch Solenoid Release, 3NC 1NO (M20)

Key sold separately
Optional integral request button available

Technical Data
Enclosure MaterialDie-Cast Metal
Enclosure protectionIP67
Operating Temperature-20 ... +40 °C
Solenoid Voltage 24V.dc (+/- 10%)
LED2 voltage24V.dc (+/- 10%)
Mechanical Life (B10d)1,000,000 cycles
Changeover pushbutton (if fitted)24V.dc / 400mA