Eaton STS366UD3 Shunt Trip Safety Switch - UL Listed
Part Number: STS366UD3
Quick Summary
The Eaton STS366UD3 shunt trip safety switch provides rapid, remote-sensed protection for 600 A, three-pole feeders in industrial panels. Maintenance teams often contend with downtime caused by protective-device miscoordination and difficult retrofits when upgrading safety circuits. This unit carries UL Listed and cUL Certified listings and is designed for NEMA 12 and NEMA 3R environments, supporting safe indoor and outdoor installations. With a 120 Vac coil and a 600 Vac / 250 Vdc rating, it enables dependable remote-tripping of circuits while simplifying panel design, wiring, and procurement. In short, STS366UD3 delivers robust protection, installation flexibility, and measurable downtime reduction for industrial control panels.
Product Information
Extended Description
STS366UD3 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, 120 Vac, NEMA 12, NEMA 3R, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UD3
UPC
786685829234
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
Enclosure
NEMA 12, NEMA 3R
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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366UD3
Feature: The 600 A amperage rating enables the STS366UD3 to handle large feeder currents without nuisance trips. This capability reduces panel size, minimizes fuse-related maintenance, and enhances reliability for critical loads in motor control centers and large feeders. Application: ideal for motor control centers and high-capacity distribution feeders in manufacturing and process plants. Feature: Three-pole construction ensures a complete circuit interruption with no partially energized contacts. Business impact: strengthens safety interlocks and reduces arc-flash risk by delivering a decisive trip across all phases. Application: suited to industrial controls, MCCs, and three-phase feeders where reliable shutdown is critical for personnel safety. Feature: 120 Vac coil voltage enables straightforward integration with standard control circuits and remote-tripping schemes across plant networks. Business impact: reduces wiring complexity, shortens installation time, and improves control reliability by leveraging common low-voltage control practices. Application: integrates with PLCs and safety interlocks systems to enhance plant-wide protection strategies. Feature: Broad voltage ratings of 600 Vac and 250 Vdc support mixed-voltage safety circuits without requiring multiple dispatchable devices. Business impact: simplifies panel design, testing, and maintenance budgets by enabling a single protective solution for diverse loads. Application: ideal for facilities with combined AC and DC automation systems. Feature: NEMA 12 and NEMA 3R enclosure compatibility provides dust and moisture protection for indoor and controlled outdoor installations. Business impact: expands deployment options while keeping critical equipment safe from environmental ingress, reducing enclosure retrofit costs. Application: suited for manufacturing floors, switchgear rooms, and outdoor panels in temperate climates. Feature: UL Listed and cUL Certified certifications support compliance with global electrical standards. Business impact: streamlines procurement, accelerates approvals, and reduces supplier risk in regulated industries. Application: ideal for aerospace, oil & gas, automotive, and process industries where verified safety credentials are mandatory. This combination supports ongoing maintenance and audits, helping facilities maintain compliance over lifecycle.
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FAQs
The STS366UD3 is designed for three-phase electrical protection in industrial control panels, motor control centers (MCCs), and high-capacity feeders. It uses a three-pole configuration and a 120 Vac coil for remote-tripping, and it can be integrated with standard PLCs and safety interlocks. It is suitable for 600 A service with 600 Vac / 250 Vdc ratings.
By delivering a definitive trip across all phases, the STS366UD3 reduces arc-flash risk and prevents partial energization. The unit's non-fusible protection and enclosure ratings (NEMA 12, NEMA 3R) support reliable operation in harsh environments, helping meet OSHA and NEC safety requirements.
Yes. The device is specified for both NEMA 12 indoor and NEMA 3R outdoor-rated enclosures, enabling flexible mounting in protected plant spaces and weather-exposed locations. Installation is simplified by its standard 120 Vac coil and three-pole design, which aligns with common control-panel practices.
Key ratings include 600 A current, 600 Vac and 250 Vdc voltage ratings, and a 120 Vac coil voltage. The unit is non-fusible, three-pole, and designed for heavy-duty protective switching. Certifications include UL Listed and cUL Certified, ensuring compliance for many industrial sectors.
Eaton provides a warranty policy of one year from installation or eighteen months from shipment, whichever occurs first. Additional support includes specification sheets and approved datasheets, and access to Eaton’s engineering resources for installation guidance and spare parts.