Eaton STS366UW14 Shunt Trip Safety Switch - NEMA 4X
Part Number: STS366UW14
Quick Summary
The Eaton STS366UW14 shunt trip safety switch provides rapid circuit disconnection for motor control centers and switchgear. Engineers often struggle with ensuring reliable tripping coordination while maintaining enclosure integrity in harsh industrial environments. UL Listed and cUL Certified, along with a NEMA 4X rated enclosure and 304 stainless steel body, reassure compliance and longevity. By combining robust protection with a compact footprint and a 24 Vac coil, it supports safe retrofit and straightforward maintenance for manufacturing facilities. In practice, design teams appreciate predictable performance, reduced downtime, and a clear path to regulatory audits. This model's three-pole configuration and alarm contact enable precise control and status signaling. It is well suited for process plants, packaging lines, and heavy machinery applications.
Product Information
Extended Description
STS366UW14 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 24 Vac, 1 NO 1 NC, NEMA 4X, 304 stainless steel, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UW14
UPC
786685829401
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
24 Vac
Protection
Non-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 - STS366UW14
Feature: 600 A amperage rating and non-fusible design. Business Impact: Enables reliable high-current switching with fail-safe isolation, reducing the risk of arc flash and equipment damage. Application: Suitable for large motor control centers and distribution panels where robustness and uptime are critical. Feature: 24 Vac coil with 1 NO 1 NC auxiliary contact. Business Impact: Facilitates remote tripping signals and status feedback, improving control coordination and diagnostics. Application: Ideal for integrated control systems and alarm signaling in automation lines. Feature: Three-pole safety switch with NEMA 4X enclosure in 304 stainless steel. Business Impact: Delivers corrosion resistance and washdown compatibility, lowering maintenance costs in harsh environments. Application: Food processing, chemical plants, and dirty environments requiring reliable protection. Feature: Voltage ratings 600 Vac and 250 Vdc. Business Impact: Supports versatile integration across varying supply schemes, reducing wiring complexity and downtime. Application: Retrofitting or upgrading mixed-voltage switchgear. Feature: UL Listed and cUL Certified. Business Impact: Ensures compliance with essential safety standards, easing regulatory audits and supplier qualification. Application: Required for regulated industries and critical infrastructure projects.
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FAQs
The STS366UW14 uses a 24 Vac control coil and is designed for high-current protection up to 600 A. It is a three-pole, non-fusible shunt-trip safety switch with one normally open and one normally closed auxiliary contact, enabling reliable remote tripping and status signaling in motor control and switchgear assemblies.
STS366UW14 features a NEMA 4X rated enclosure constructed from 304 stainless steel, delivering excellent corrosion resistance and washdown durability in challenging environments. The rugged enclosure supports three-pole operation, houses the 1 NO 1 NC auxiliary contact, and pairs with a 600 A, 24 Vac coil for reliable remote tripping. Ideal for process plants and food-grade facilities.
Yes. The STS366UW14 is designed for demanding industrial settings where moisture and contaminants are present, thanks to its NEMA 4X enclosure and stainless steel construction. The combination provides ingress protection while maintaining electrical safety for high-current switching. Use in chemical plants, beverage facilities, and automated lines is well-supported.
STS366UW14 carries UL Listed and cUL Certified markings, ensuring compliance with North American safety standards for electrical protection devices. These certifications, together with its NEMA 4X enclosure and non-fusible design, support end-user qualification for system design, maintenance, and safety audits in regulated industries such as oil & gas, manufacturing, and food processing.
Configured as 1 normally open and 1 normally closed auxiliary contact, the STS366UW14 provides both tripping signaling and status feedback. The 24 Vac coil controls the shunt release, while the 600 Vac/250 Vdc ratings support versatility across main circuits. This makes installation straightforward in existing control circuits and improves remote monitoring and fault diagnosis.