Eaton STS366FW31 Shunt Trip Safety Switch - cUL UL Listed
Part Number: STS366FW31
Quick Summary
Eaton shunt trip safety switch enables automatic shutdown of power systems in critical industrial panels. This solution addresses the daily challenge of delivering rapid, reliable tripping without compromising operator access or maintenance workflows. With a cUL Certified and UL Listed certification and a rugged NEMA 4X, 304 stainless steel enclosure, it stands up to harsh environments while protecting personnel and equipment. The combination of a 600 A rating, 120 Vac coil, and 1 NO-1 NC contact configuration supports robust control, monitoring, and integration in modern switchgear. Designed for efficiency and uptime, it aligns with procurement goals and long-term total cost of ownership in industrial facilities.
Product Information
Extended Description
STS366FW31 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 120 Vac, 1 NO-1 NC, NEMA 4X, 304 stainless steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366FW31
UPC
786685828879
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
145 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
cUL Certified UL Listed
Auxiliary contacts
Alarm switch
Enclosure
NEMA 4X
Enclosure material
304 stainless steel
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
600A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
1 NO-1 NC
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366FW31
Feature → Business Impact → Application: The STS366FW31 uses a three-pole, 600 A design with a 600 Vac / 250 Vdc rating and a 120 Vac coil, enabling precise and fast fault isolation that minimizes arc flash exposure and reduces outage duration in power distribution panels. This directly improves safety metrics and operational reliability across critical processes, from packaging lines to heavy industry conveyors. Feature → Business Impact → Application: The NEMA 4X enclosure crafted from 304 stainless steel provides exceptional corrosion resistance and washdown compatibility, lowering maintenance frequency and extending service life in wet or dusty environments such as manufacturing floors and outdoor enclosures. Feature → Business Impact → Application: The alarm switch auxiliary contact and 1 NO-1 NC configuration enable seamless PLC/SCADA signaling and interlocks, improving automation visibility and fault reporting for faster, data-driven decisions in switchgear assemblies. Feature → Business Impact → Application: Fusible protection and a robust mechanical footprint support straightforward integration into existing control schemes, reducing retrofit complexity and ensuring compliance with protective coordination standards in motor control centers. Feature → Business Impact → Application: Comprehensive specifications and Eaton’s warranty offer peace of mind for procurement teams, reducing risk during deployment and supporting long-term maintenance planning for facility resilience.
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FAQs
STS366FW31 is a three-pole, 600 A device with a 12.43 in depth, 28.29 in width, and 62.97 in height, weighing 145 lb. Ensure adequate panel space, structural support, and clearance for safe access. It should be mounted in compatible switchgear with a 120 Vac coil control circuit and integrated with the 1 NO-1 NC configuration for signaling and interlocking.
Key specs include a 600 A amperage rating, voltage rating of 600 Vac / 250 Vdc, coil voltage of 120 Vac, and a 1 NO-1 NC contact configuration across three poles, with fusible protection for fault isolation.
Yes. The unit is housed in a NEMA 4X enclosure constructed from 304 stainless steel, delivering excellent corrosion resistance and suitability for washdown and harsh environments commonly found in process and outdoor installations.
STS366FW31 carries cUL Certified and UL Listed certifications, ensuring compliance with electrical safety and performance standards. This, combined with the rugged enclosure, supports enterprise-grade reliability and procurement confidence for regulated applications.
The device promotes higher uptime by delivering reliable, rapid tripping in fault conditions, reducing unplanned downtime and arc-flash risk. Its robust build and warranty support long-term maintenance planning, helping protect capital investment in switchgear and control systems.