SS-OSY

The NOTIFIER SS-OSY is a supervisory switch for OS&Y (Outside Screw and Yoke) gate valves, monitoring valve position to ensure proper fire protection system readiness.​
It features two SPDT contacts for vandal alarm and valve-closed signals, adjustable actuator length, and single-side conduit entry, commonly used with fire alarm panels for tamper supervision.​
Key Specifications
Feature
Specification
Type
OS&Y valve supervisory switch ​
Contacts
2 × SPDT (vandal alarm + valve closed) ​
Wiring
Up to 12 AWG; single conduit entry ​
Mounting
Fits newer valve yokes; adjustable shaft ​
Function
Monitors valve position; simultaneous panel/bell activation ​