Eaton STS366UW31 Shunt Trip Safety Switch - NEMA 4X
Part Number: STS366UW31
Quick Summary
Eaton shunt trip safety switch provides rapid circuit interruption for motor control centers and critical switchgear protection. Engineers often grapple with nuisance trips and slow fault isolation that drive downtime and escalation costs. Highlights include UL Listed and cUL Certified status, plus a NEMA 4X enclosure to withstand harsh environments. This solution is designed to integrate smoothly with existing control schemes, delivering reliable protection while simplifying compliance documentation. By aligning high-capacity protection with straightforward installation, it supports safer operations, reduced unplanned downtime, and a clear path to regulatory adherence in industrial facilities.
Product Information
Extended Description
STS366UW31 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, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UW31
UPC
786685829425
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
140 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
Non-Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
1 NO-1 NC
Feature → Business Impact → Application: 600 A, 600 Vac, 250 Vdc ratings enable rapid isolation of heavy loads, reducing fault energy transfer and protecting both personnel and equipment in power distribution and motor control centers. Application: MCCs, power panels, and outdoor switchgear benefit from predictable tripping performance and improved uptime. Feature → Business Impact → Application: Three-pole, non-fusible configuration with 1 NO-1 NC auxiliary contact provides clear local status and remote signaling for safer operation and easier interlocking in machine controls. Application: Plant automation and safety interlocks in stamping, extrusion, and packaging lines. Feature → Business Impact → Application: 120 Vac coil voltage simplifies control-system integration, enabling straightforward energization from standard control circuits and accessories. Application: Centralized control rooms and automated lines requiring reliable coil drive. Feature → Business Impact → Application: NEMA 4X enclosure and 304 stainless steel construction deliver corrosion resistance and robust outdoor performance, extending service life in harsh indoor/outdoor environments. Application: Coastal facilities, washdown areas, and outdoor equipment enclosures. Feature → Business Impact → Application: UL Listed and cUL Certified ensure regulatory compliance and safe device qualification, accelerating procurement and installation approvals. Application: Facilities pursuing safety standards and industry audits. Feature → Business Impact → Application: Alarm switch integration for enhanced fault detection and interlock sequencing, supporting safer maintenance and predictable shutdowns. Application: Safety programs and preventive maintenance in critical production lines.
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FAQs
STS366UW31 is designed for standard three-pole mounting with a NEMA 4X enclosure and 304 stainless steel construction, ensuring straightforward integration into existing Eaton or compatible switchgear. With a 12.43 in depth and 28.29 in width footprint, it fits common panel openings while preserving clearance for wiring and maintenance access.
The device is rated for 600 A, 600 Vac, and 250 Vdc, with a 120 Vac coil. The 1 NO-1 NC auxiliary contact provides local status indication and potential interlock signaling. These specs support heavy-duty shutdowns and reliable control circuit signaling in high-power equipment and industrial applications.
Yes. The unit features a NEMA 4X enclosure and 304 stainless steel construction, offering corrosion resistance and protection against water ingress in harsh or washdown settings, making it appropriate for outdoor and moisture-prone facilities.
The product is UL Listed and cUL Certified, providing recognized safety approvals for North American markets. These certifications support regulatory compliance, supplier qualification, and smoother procurement for safety-critical electrical installations.
Consider routine inspection of the alarm switch and enclosure integrity as part of preventive maintenance. The unit carries a standard warranty (one year from installation or 18 months from shipment, whichever is first). Regular checks help ensure reliable operation and timely fault detection in high-demand lines.