Eaton STS366ND31 Shunt Trip Safety Switch - UL Listed
Part Number: STS366ND31
Quick Summary
Eaton shunt trip safety switch provides fast, automatic disconnection for motor control centers and safety interlocks. Owners often contend with nuisance trips, inconsistent signaling, and difficult diagnostics; this device helps minimize false trips and speeds troubleshooting. UL Listed and cUL Certified ratings sit alongside a rugged NEMA 12, NEMA 3R enclosure for real-world environments. With a three-pole design and a 120 Vac coil, it integrates cleanly into industrial panels, delivering safer operation and measurable uptime gains.
Product Information
Extended Description
STS366ND31 Eaton: Eaton Shunt trip safety switch, 600 A, 1NO/1NC alarm switch only, Coil V: 120 Vac, NEMA 12/3R, 600 V, Three-pole, Fusible with neutral
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366ND31
UPC
786685828961
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 12, NEMA 3R
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: 600 A amperage rating and a three-pole design enable safe interruption of high-current motor feeders in modern MCCs. This capability reduces the need for parallel devices and improves fault isolation reliability, translating to less downtime and safer startup sequences in demanding manufacturing environments. Application: Ideal for large motor feeders and feeder protection schemes in industrial facilities. Feature: 120 Vac coil voltage enables straightforward integration with plant control logic. Business Impact: Supports remote tripping via PLC/DCS safety interlocks, reducing manual intervention and speeding response times during faults. Application: Process lines, conveyors, and pump assemblies where centralized safety control is essential. Feature: Auxiliary contact (1 NO-1 NC) provides alarm signaling to plant-wide monitoring systems. Business Impact: Improves fault visibility and maintenance planning while enabling real-time safety status to be communicated to BAS/SCADA. Application: Safety interlock circuits and alarm annunciation in control panels. Feature: NEMA 12, NEMA 3R enclosure offers rugged protection for indoor and occasional outdoor environments. Business Impact: Extends service life in harsh facilities and reduces enclosure-related maintenance, enabling safer field installations. Application: Industrial control panels in manufacturing, processing, and outdoor utility areas. Feature: Voltage rating of 600 Vac / 250 Vdc with fusible protection provides robust, versatile protection for both AC and DC circuits. Business Impact: Supports comprehensive plant protection schemes and simplifies parts stocking for mixed systems. Application: Large-scale automation and power distribution networks across facilities.
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FAQs
To ensure compatibility, verify enclosure space and mounting footprint for the three-pole STS366ND31, confirm the 120 Vac coil supply is available from the control circuit, and wire the device for 1 NO-1 NC auxiliary signaling. Follow the Eaton specification sheet for proper torque, shielded wiring practices, and any required lockout/tagout procedures during installation to maintain UL/cUL compliance.
The unit delivers a 600 A amperage rating with three-pole construction, enabling reliable interruption of large motor feeders. Its fusible protection, 600 Vac/250 Vdc voltage ratings, and remote 120 Vac coil support fast, clean isolation in MCCs, reducing arcing and downtime while improving overall protection coordination in heavy-industrial environments.
Yes. The enclosure is rated for NEMA 12 and NEMA 3R, providing dust resistance and rain/ice protection suitable for indoor and some outdoor applications. For outdoor use, ensure proper mounting, drainage, and enclosure ingress protection per site conditions, and confirm wiring methods meet local electrical codes and manufacturer guidance.
The STS366ND31 carries UL Listed and cUL Certified classifications, indicating compliance with recognized safety standards for both North American and cross-border installations. These certifications support conformity to regulatory requirements in many industries and help streamline panel approvals during project commissioning.
Maintenance is typically minimal beyond periodic inspection of the trip circuit and auxiliary contact. The product’s safety features reduce unplanned downtime, contributing to measurable ROI through safer operation and faster fault isolation. The warranty guidance aligns with the Eaton policy, offering protection against manufacturing defects during the initial period of use.