{"product_id":"potter-vsr-4","title":"POTTER VSR-4","description":"\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003cmeta\u003e\u003cmeta\u003e\u003ctitle\u003eeBay\u003c\/title\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003cdiv\u003eProduct Overview The Potter VSR-4 is a vane-type waterflow switch designed for wet sprinkler systems, providing reliable detection of water movement for fire alarm signaling. UL Listed, FM Approved, and compliant with NFPA standards, the VSR-4 is suitable for steel pipe schedules 10–40, ranging from 2\" to 8\" (50–200 mm). The device is equipped with two SPDT snap-action switches and an adjustable pneumatic retard, which activates when flow reaches 10 GPM (38 LPM) or higher downstream of the unit. Its rugged NEMA 4\/IP54-rated die-cast enclosure allows use in both indoor and outdoor environments.\u003cbr\u003e\u003cbr\u003eKey Features\u003cbr\u003e\u003cbr\u003e- Flow Detection: Vane-type design with adjustable pneumatic retard; triggers at flows ≥10 GPM (38 LPM).\u003cbr\u003e- Dual SPDT Switches: Two single-pole, double-throw switches for reliable signaling; each rated 10 A @ 125\/250 VAC, 2 A @ 30 VDC resistive, 10 mA min. @ 24 VDC.\u003cbr\u003e- Pipe Compatibility: Suitable for 2\"–8\" (50–200 mm) steel pipes; LPC approved for 2\"–8\" sizes.\u003cbr\u003e- NFPA Compliance: Supports NFPA-13, NFPA-13D, NFPA-13R, and NFPA-72 standards.\u003cbr\u003e- Environmental Protection: NEMA 4\/IP54-rated enclosure with factory-installed gasket; temperature range 40°F–120°F (4.5°C–49°C).\u003cbr\u003e- Conduit Access: Two 1\/2\" conduit knockouts; individual switch compartments support dissimilar voltages.\u003cbr\u003e- Durable Construction: Non-corrosive sleeve and die-cast housing for long-term reliability.\u003c\/div\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e\u003clink\u003e","brand":"FIRE ALARM SYS","offers":[{"title":"Default Title","offer_id":51573913747776,"sku":"195958804456","price":223.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/6466\/0032\/files\/191d3dc8fea9431ab8704ba8114f1486.jpg?v=1772203190","url":"https:\/\/firealarmsys.com\/products\/potter-vsr-4","provider":"FIRE ALARM SYS","version":"1.0","type":"link"}