Eaton STS366NW64 Shunt Trip Safety Switch - UL Listed
Part Number: STS366NW64
Quick Summary
The Eaton STS366NW64 shunt trip safety switch provides instant isolation for electrical cabinets and switchgear. End users struggle with ensuring fast, fail-safe trips during faults while meeting space, maintenance, and corrosion resistance requirements. UL Listed, cUL Certified, and a NEMA 4X enclosure protect equipment in harsh environments, while 304 stainless steel construction adds durability in washdown areas. This rugged 600 A, three-pole device with a 24 Vdc coil enables reliable protection without compromising control circuits. By integrating this unit, engineers can simplify procurement, improve uptime, and ensure compliant protection for industrial feeders and safety interlocks. Its fusible design and alarm switch support diagnostics and safer, proactive maintenance.
Product Information
Extended Description
STS366NW64 Eaton: Eaton shunt trip safety switch, 600 A, Three pole, 600 Vac, 250 Vdc, Alarm switch, 24 Vdc, 1 NO 1 NC, NEMA 4X, 304 stainless steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366NW64
UPC
786685829197
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 4X
Enclosure material
304 stainless steel
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
600A
Coil voltage
24 Vdc
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 - STS366NW64
High-current protection: The STS366NW64 is rated for 600 A with a 24 Vdc coil and 600 Vac / 250 Vdc voltage ratings, wired as 1 NO 1 NC. This combination delivers decisive fault clearance with minimal control circuit interference, reducing downtime and safeguarding motor drives and feeders in heavy manufacturing environments. In practice, this means faster isolation during faults and safer lockout procedures in MCCs and switchgear assemblies. Rugged enclosure and materials: A NEMA 4X enclosure and 304 stainless steel provide corrosion resistance and washdown compatibility, reducing maintenance cycles and extending service life in chemical plants, food & beverage facilities, and outdoor installations. This construction also supports compliant operation in harsh environments while maintaining actuator reliability in dusty or humid facilities. Diagnostics and safety signaling: An auxiliary alarm switch (1 NO 1 NC) enables real-time fault signaling to PLCs or HMIs, improving operator awareness and enabling preventive maintenance while lowering the risk of undetected faults. Installation compatibility and lifecycle: The three-pole design and substantial footprint are aligned with typical MCC and large switchgear configurations, making installation straightforward when room for wiring, clearance, and mounting provisions is available; the unit carries a one-year warranty from installation or eighteen months from shipment, whichever comes first. Industry insights: In modern plants, integrating this shunt trip with remote signaling reduces risk and elevates uptime, while the fusible protection and certified construction support compliance programs and audits.
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FAQs
For MCC integration, verify enclosure clearance and allow wiring space for the 28.29 in width, 62.97 in height, and 12.43 in depth. Ensure mounting hardware supports a 149 lb unit and provide access to the 24 Vdc coil wiring, auxiliary alarm contact, and 1 NO 1 NC contacts. Confirm compatibility with standard bus bars and protective interlocks in the control cabinet.
Key specs include a 600 A amperage rating, three-pole configuration, voltage ratings of 600 VAC and 250 VDC, a 24 Vdc coil, and contact configuration 1 NO 1 NC. The device is fusible and designed to interrupt power quickly, with a NEMA 4X enclosure suitable for harsh environments.
Yes. The unit uses a 304 stainless steel enclosure rated for NEMA 4X, which provides excellent corrosion resistance and washdown compatibility, making it suitable for chemical plants, food & beverage facilities, and outdoor installations where harsh cleaning and exposure occur.
STS366NW64 is UL Listed and cUL Certified, which simplifies regulatory acceptance and supplier audits. The NEMA 4X enclosure further supports compliance with enclosure integrity standards in demanding environments.
Consider the 1-year warranty from installation or 18 months from shipment, whichever occurs first. The integrated alarm switch provides diagnostic signaling for proactive maintenance, and the fusible protection helps manage fault isolation lifecycle. Refer to the Eaton specification sheet for service intervals and replacement fuse recommendations.