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 (SS-ISB4-SR)

The SS-ISB4-SR can be used to isolate the control circuitry, and is designed to be mounted externally. To turn the key, the solenoid requires a 24VDC signal to energise, allowing the key to be removed and transferred to the next stage in your Trapped Key System.


  • Body Material: 316 Grade Stainless Steel
  • Ingress Protection: IP69K
  • Contacts: 2NC + 2NO, 3NC + 1NO Monitoring Contact Blocks
  • Indication: LED 1 Solenoid Status Indication / LED 2 is an Optional Auxiliary Indication Circuit
  • Connection: 3 x M20 or ½” NPT Conduits
Part No. Part Description
SS-ISB4-SR-22 Control Switch Solenoid Release, 2NC 2NO (M20)
SS-ISB4-SR-22-PB Control Switch Solenoid Release, 2NC 2NO (M20) + Push Button
SS-ISB4-SR-31 Control Switch Solenoid Release, 3NC 1NO (M20)
SS-ISB4-SR-31-PB Control Switch Solenoid Release, 3NC 1NO (M20) + Push Button

Note
Key sold separately
Optional integral request button available

Technical Data
ApprovalscULus
Enclosure Material316 Grade Stainless Steel
Enclosure protectionIP67, IP69K (NEMA 6)
Operating Temperature-20 ... +40 °C
Solenoid Voltage24V.dc (+/- 10%)
LED2 voltage24V.dc (+/- 10%)
Mechanical Life (B10d)1,000,000 cycles
Changeover pushbutton (if fitted)24V.dc / 400mA