Eaton Shunt Trip Safety Switch STS366UD14 - UL Listed
Part Number: STS366UD14
Quick Summary
The Eaton Shunt Trip Safety Switch STS366UD14 provides reliable remote-tripping for large motor circuits and MCC panels, helping you isolate power quickly when needed. One common pain point is nuisance trips and unclear trip signals that drain uptime; this unit delivers a clear alarm switch, precise actuation, and robust ratings to minimize surprises. UL Listed and cUL Certified, with NEMA 12 and NEMA 3R enclosures, supports indoor and protected outdoor installations in industrial environments. Rated at 600 A with 600 Vac and 250 Vdc, and featuring a 24 Vac coil plus a 1 NO 1 NC contact, it aligns with standard control architectures for safer, compliant protection.
Product Information
Extended Description
STS366UD14 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 24 Vac, 1 NO 1 NC, NEMA 12, NEMA 3R, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UD14
UPC
786685829227
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 12, NEMA 3R
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 - STS366UD14
Feature: Three-pole, 600 A rating with a non-fusible design. Business Impact: Ensures decisive circuit isolation under fault conditions, reducing arc flash risk and facilitating safe maintenance. Application: Motor control centers and large switchgear assemblies where high current interruption is required. Feature: 24 Vac coil with remote trip capability and built-in alarm switch. Business Impact: Enables centralized safety interlocks and real-time status signaling, cutting diagnostic time and preventing unplanned shutdowns. Application: Integrated safety systems in automation lines and plant-wide control architectures. Feature: NEMA 12 and NEMA 3R enclosure compatibility. Business Impact: Provides environmental protection for indoor and protected outdoor locations, lowering enclosure-related failures and extending service life. Application: Industrial facilities with dust, moisture, or incidental exposure. Feature: UL Listed and cUL Certified. Business Impact: Supports regulatory compliance and supplier qualification, reducing risk in audits and procurement reviews. Application: Facilities adhering to NEC/OSHA safety standards in automation and power distribution. Feature: 1 NO 1 NC auxiliary contacts with non-fusible protection. Business Impact: Enhances fault indication and control interlocks while simplifying maintenance and diagnostics. Application: Control panels requiring clear trip signaling and integration with PLC or HMI systems.
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FAQs
STS366UD14 is a three-pole, 600 A shunt trip switch designed for motor control centers. It fits typical MCC layouts with standard bus connections and field wiring compatible with 24 Vac coil control. Ensure the enclosure is rated NEMA 12 or NEMA 3R for your environment, and wire the 1 NO 1 NC auxiliary contact for monitoring. Proper clearance and torque specs should follow Eaton’s literature to maintain safety and performance.
STS366UD14 provides a 600 A amperage rating, supports 600 Vac and 250 Vdc voltage ratings, and uses a 24 Vac coil for remote trip actuation. It features a 1 NO 1 NC contact configuration and a non-fusible design, making it suitable for rapid isolation while maintaining compatibility with common control circuits in industrial applications.
Yes. The switch is accommodated by NEMA 12 and NEMA 3R enclosures, enabling indoor use or sheltered outdoor installations. NEMA 3R provides protection against rain and corrosion, while NEMA 12 shields from dust and non-protective splashes, making the unit versatile for varied industrial environments.
The STS366UD14 is UL Listed and cUL Certified, signaling compliance with recognized safety standards. This helps with regulatory audits, aligns with NEC/OSHA safety requirements, and supports procurement and installation approvals in regulated facilities, reducing risk during inspections and enhancing overall safety program credibility.
The unit’s non-fusible design and built-in alarm contact help simplify diagnostics and reduce downtime during fault events. With a robust 600 A/600 Vac rating and durable NEMA enclosures, maintenance intervals focus on routine inspection of wiring connections and control circuits. The UL/cUL certifications also support longer-term compliance and potential reductions in spare parts inventory due to standardized, widely adopted components.