Eaton STS366ND32 Shunt Trip Safety Switch - UL Listed
Part Number: STS366ND32
Quick Summary
Eaton STS366ND32 shunt trip safety switch provides rapid disconnection for motor feeders and switchgear applications. Engineers often battle costly downtime and safety risks when protective devices fail to trip reliably. UL Listed and cUL Certified, the unit also features rugged NEMA 12 and NEMA 3R enclosure ratings to survive demanding environments. With a 600 A rating and 600 Vac/250 Vdc voltage capability, it integrates with standard control circuits while delivering dependable protection. Its auxiliary contact 1 NO 1 NC and 3-pole design support flexible interlocking and signaling in complex automation architectures. The catalog number STS366ND32 ensures straightforward sourcing and compatibility with Eaton and third-party protective devices.
Product Information
Extended Description
STS366ND32 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Auxiliary contact, 120 Vac, 1 NO 1 NC, NEMA 12, NEMA 3R, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366ND32
UPC
786685828978
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
Auxiliary contact
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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366ND32
Feature: 600 A amperage rating. Business Impact: Enables reliable protection for high-current loads, reducing overheating and equipment wear while supporting stable system operation. Application: suitable for large motor feeders and distribution panels within MCCs and switchgear assemblies. Long-tail keyword: high-current protective switch for motor feeders. Feature: 120 Vac coil voltage. Business Impact: simplifies integration with standard control circuits and minimizes wiring complexity. Application: control circuits in industrial automation and plant protection schemes. Long-tail keyword: 120 Vac coil control circuit compatibility. Feature: NEMA 12 and NEMA 3R enclosure. Business Impact: provides indoor dry or damp location protection and weather-resilient performance, lowering environmental failure risk. Application: installation in manufacturing floors, plant rooms, or outdoor equipment enclosures. Long-tail keyword: rugged enclosure for protective switches. Feature: 3-pole design with 1NO 1NC auxiliary contact. Business Impact: enables flexible interlocking, signaling, and remote status monitoring in safety circuits. Application: interlocks in safety interlock systems and control logic auditing. Long-tail keyword: auxiliary contact 1NO 1NC for safety circuits. Feature: Fusible protection and 600 Vac / 250 Vdc ratings. Business Impact: reduces fuse-related protection gaps and simplifies coordination with upstream protective devices. Application: coordinated protection schemes in electrical distribution. Long-tail keyword: fusible safety switch for high-voltage protection. Feature: Certifications UL Listed and cUL Certified. Business Impact: ensures regulatory acceptance and easier procurement in regulated industries. Application: procurement for regulated environments and compliance-driven projects. Long-tail keyword: UL listed safety switch compliance. Feature: Robust warranty and sourcing. Business Impact: minimizes risk with clear Eaton warranty terms and a straightforward sourcing path via catalog STS366ND32. Application: asset lifecycle planning and maintenance budgeting. Long-tail keyword: Eaton specification sheet availability and procurement.
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FAQs
The STS366ND32 is a three-pole device rated for 600 A, designed for NEMA 12 and NEMA 3R enclosures, and includes an auxiliary contact (1 NO 1 NC). Plan for a 12.43 in depth, 28.29 in width, and 62.97 in height footprint in dedicated protection panels. Ensure compatible 120 Vac control wiring and verify fusible protection coordination with upstream breakers and fuses.
Key ratings include 600 A amperage, 600 Vac line voltage, and 250 Vdc control voltage support. The coil operates at 120 Vac, and the device provides a 1 NO 1 NC auxiliary contact in a three-pole configuration, with fusible protection as part of the protection scheme.
Yes. The three-pole design, 600 A rating, and NEMA 12/3R enclosure compatibility make it well-suited for MCCs and switchgear. Its shunt-trip capability enables rapid disconnection in protection schemes, while the auxiliary contact facilitates signaling and interlocking with control logic in complex automation architectures.
The STS366ND32 is UL Listed and cUL Certified, signifying compliance with recognized safety and performance standards. These certifications simplify procurement for regulated environments and support safe integration into existing protection architectures across industrial facilities.
The unit ships with clear warranty terms (one year from installation or eighteen months from shipment) and a robust build suited for demanding environments, which reduces maintenance frequency and downtime. By providing reliable tripping, compatible control interfaces, and long service life, it can lower total cost of ownership in critical protection applications.