Eaton STS366NW31 Shunt Trip Switch - UL Listed, NEMA 4X
Part Number: STS366NW31
Quick Summary
Eaton shunt trip safety switch provides fast interlock control for industrial power distribution panels. In critical safety applications, a delayed or nuisance trip can halt production and jeopardize worker safety. This model carries UL Listed and cUL Certified marks and a NEMA 4X enclosure, featuring 304 stainless steel for corrosion resistance. With a 600 A rating and a 120 Vac coil, it integrates smoothly into high-demand systems, delivering reliability while reducing maintenance costs. Designed for integration with standard control circuits and Eaton accessory kits, it supports efficient commissioning and predictable downtime.
Product Information
Extended Description
STS366NW31 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
STS366NW31
UPC
786685829159
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
149 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
UL Listed cUL Certified
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
Feature: High amperage and three-pole construction enable direct protection for heavy motor loads. Business Impact: Enhances short-circuit response and coordination with upstream protection, reducing unplanned downtime. Application: Ideal for large electrical drives and panel assemblies in manufacturing environments. Feature: NEMA 4X enclosure with 304 stainless steel offers rugged weather and corrosion resistance. Business Impact: Extends service life in harsh or outdoor installations, lowering maintenance costs. Application: Outdoor switchgear, washdown areas, and corrosive facilities. Feature: 1 NO-1 NC auxiliary contacts and 120 Vac coil simplify control wiring. Business Impact: Speeds up installation and improves fault indication, reducing commissioning time. Application: Control circuits, alarm signaling, and remote interlock systems. Feature: Fusible protection and standard 600 Vac / 250 Vdc ratings ensure safe operation across loads. Business Impact: Improves selective coordination and personnel safety, supporting compliance. Application: Industrial power distribution and critical process panels. Feature: UL Listed and cUL Certified with documented performance data. Business Impact: Facilitates regulatory approvals and audits, lowering project risk. Application: System integrations requiring recognized safety certifications. Feature: Large form factor and three-pole design support straightforward retrofits and compatibility with common MCCB standards. Business Impact: Reduces installation complexity and inventory variety. Application: Retrofit projects and new builds in industrial facilities.
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FAQs
STS366NW31 is a three-pole device with a 120 Vac coil and a 1 NO-1 NC contact arrangement. It is designed for standard panel mounting in NEMA 4X enclosures and integrates with common control wiring practices, reducing wiring complexity and enabling straightforward retrofits in existing motor control and safety interlock panels.
The unit provides a 600 A amperage rating, with voltage ratings of 600 Vac and 250 Vdc, plus a 120 Vac coil. These specifications support high-current safety interlocks in demanding environments, ensuring reliable tripping under fault conditions while maintaining safe control voltages for signaling and coordination with upstream protection.
This shunt trip switch is well-suited for industrial power distribution panels, motor control centers, and process automation systems. It supports emergency shutdown and safety interlock schemes in manufacturing, water treatment, and packaging lines where rapid, reliable trips are essential to protect personnel and equipment.
The STS366NW31 is UL Listed and cUL Certified, with a NEMA 4X enclosure. These certifications verify safety and performance, facilitate regulatory approvals, and simplify audits for facilities aiming to meet industrial electrical standards and maintain compliance in harsh or washdown environments.
With a robust 304 stainless steel NEMA 4X enclosure, corrosion resistance, and a proven safety interlock design, the STS366NW31 reduces downtime from environmental wear and nuisance trips. Its compatibility with standard control circuits, clear diagnostics, and Eaton’s support ecosystem contribute to lower maintenance costs and faster return on investment.