Eaton STS366NW3 Shunt Trip Safety Switch - UL Listed
Part Number: STS366NW3
Quick Summary
STS366NW3 shunt-trip safety switch by Eaton is a high-current disconnect device designed for demanding industrial power feeds and emergency-stop applications. It provides fast, reliable isolation of three-pole circuits to prevent cascading faults and minimize downtime. In real-world plants, nuisance trips, slow response, or corroded enclosures can compromise safety and productivity; this unit addresses those issues with robust construction and proven performance. Certified for UL Listed and cUL Certified with a NEMA 4X stainless steel enclosure, it stands up to washdown, dust, and corrosive environments. Its 600 A rating and 120 Vac coil voltage support flexible control schemes, while the 600 Vac / 250 Vdc voltage rating enables safe utility coordination. This combination delivers sustained uptime and compliant protection for critical loads.
Product Information
Extended Description
STS366NW3 Eaton: Eaton shunt trip safety switch, 600 A, Three pole, 600 Vac, 250 Vdc, 120 Vac, NEMA 4X, 304 stainless steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366NW3
UPC
786685829142
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
Enclosure
NEMA 4X
Enclosure material
304 stainless steel
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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366NW3
Three-pole configuration with shunt-trip action delivers rapid isolation of large power circuits, reducing the risk of fault propagation and enabling safer maintenance windows. The fusible protection option simplifies coordination with upstream protection schemes while maintaining a compact footprint in heavy-duty panels. Its 304 stainless steel, NEMA 4X enclosure provides superior corrosion and water ingress resistance, making it suitable for washdown environments and harsh industrial settings. The coil operates at 120 Vac, while the device supports 600 Vac and 250 Vdc main ratings, enabling flexible integration with mixed AC/DC control architectures. UL Listed and cUL Certified, the STS366NW3 satisfies stringent regulatory requirements and procurement standards for regulated industries. The robust build and precise specification streamlines installation, reduces commissioning time, and lowers long-term maintenance costs, contributing to measurable uptime gains. For engineers planning scalable protection schemes, this unit aligns with Eaton’s Switching Devices Flex Center and standard panel practices, easing compatibility and stock management. Overall, these attributes translate to reliability, safety, and a lower total cost of ownership for critical loads.
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FAQs
For installation, select a three-pole mounting configuration compatible with a NEMA 4X enclosure. Route the 120 Vac coil control wiring to the coil terminals and connect the main conductors to meet 600 Vac, 250 Vdc ratings. Verify enclosure integrity and secure mounting to minimize vibration. Consult the Eaton datasheet STS366NW3 for wiring diagrams and torque specs to ensure reliable operation.
Key specs include three-pole operation with a 600 A amperage rating, 120 Vac coil voltage, and main voltage ratings of 600 Vac and 250 Vdc. The device is fusible and enclosed in a 304 stainless steel NEMA 4X housing, offering UL Listed and cUL Certified safety and reliability for industrial protection and circuit control.
Yes. The NEMA 4X enclosure constructed from 304 stainless steel provides excellent corrosion and washdown resistance, making it well-suited for food processing, chemical plants, and outdoor installations where exposure to moisture and contaminants is common.
The STS366NW3 is UL Listed and cUL Certified, signaling compliance with recognized safety standards. These certifications are often required for regulated industries and formal procurement, reducing qualification risk and easing regulatory approvals during audits and inspections.
The device features rugged stainless steel construction and a simplified protection scheme, contributing to low maintenance and high reliability. Eaton’s one-year warranty from installation (or 18 months from shipment) helps reduce ownership risk, while improved uptime from rapid isolation minimizes production downtime and supports a favorable return on investment over the equipment life cycle.