Potter OSYSU-2


Outside Screw & Yoke Supervisory Switch (Double switch)

Availability: Estimated 6 - 8 Business Days

  • Factory New
Brand: Potter FireAlarm.com Part #: 4576 Categories: , , Manufacturer Part #: OSYSU-2Secondary Part #: 1010202 Tags: , ,


The OSYSU is used to monitor the open position of an OS&Y (outside screw and yoke) type gate valve. This device is available in two models; the OSYSU-1, containing one set of SPDT (Form C) contacts and the OSYSU-2, containing two sets of SPDT (Form C) contacts. These switches mount conveniently to most OS&Y valves ranging in size from 2” to 12” (50mm to 300mm). They will mount on some valves as small as 1⁄2” (12,5mm).

The cover is held in place by two tamper resistant screws that require a special tool to remove. The tool is furnished with each device.


Weight 1.60 lbs
Dimensions 3.05 × 4.00 × 6.00 in






  • NEMA 4X* (IP 65) and 6P (IP 67)
    • Enclosure is 4X. For additional corrosion protection of mounting hardware, use model OSYSU-2 CRH
  • -40 to 140 (-40C to 60C) operating temperature range
  • Visual switch indicators
  • Two conduit entrances
  • Adjustable length trip rod
  • Accommodates up to 12AWG wire
  • Three position switch detects tampering and valve closure
  • Knurled mounting bracket prevents slipping
  • Fine adjustment feature for fast, easy installation
  • RoHS compliant
  • One or two SPDT contact models (-1,-2)


OSYSU Series; Outside Screw and Yoke Valve Supervisory Switch
Potter – Data Sheet


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