Eaton STS366NW1 Shunt Trip Safety Switch - NEMA 4X
Part Number: STS366NW1
Quick Summary
The Eaton STS366NW1 shunt trip safety switch is engineered to quickly interrupt power in motor control and electrical distribution panels. Maintenance teams frequently wrestle with operator safety concerns and nuisance trips in high‑current equipment, and this device delivers reliable control signaling to prevent arc flash and equipment damage. It carries UL Listed and cUL Certified marks with a NEMA 4X enclosure, plus a 304 stainless steel body for harsh environments. From a business perspective, the combination of high‑current capability and a rugged enclosure reduces downtime, simplifies compliance, and lowers lifecycle costs. In modern plant safety schemes, it functions as an industrial safety switch within switchgear and motor control centers, supporting remote trip coordination.
Product Information
Extended Description
STS366NW1 Eaton: Eaton shunt trip safety switch, 600 A, Three pole, 600 Vac, 250 Vdc, 24 Vac, NEMA 4X, 304 stainless steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366NW1
UPC
786685829111
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
cUL Certified UL Listed
Enclosure
NEMA 4X
Enclosure material
304 stainless steel
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
600A
Coil voltage
24 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366NW1
Feature: Three-pole design with a 600 A amperage rating, 600 Vac, and 250 Vdc voltage ratings, plus a 24 Vac coil and fusible protection. Business Impact: Enables precise protective coordination and rapid disengagement under fault conditions, minimizing downtime and equipment stress. Application: Ideal for heavy-industry switchgear and motor control centers where high-current protection and remote trip capability are required. Feature: NEMA 4X enclosure made from 304 stainless steel. Business Impact: Delivers corrosion and washdown resistance, extending service life in damp, corrosive, or outdoor environments. Application: Food processing, chemical plants, and outdoor installations where equipment longevity matters. Feature: Shunt trip functionality with remote control signaling. Business Impact: Allows centralized safety interlocks and automated plant-wide trip schemes, improving operator protection and process safety. Application: Centralized control panels and protective interlock architectures. Feature: Fusible protection integrated in a rugged housing. Business Impact: Reduces component count and simplifies wiring, lowering installation time and lifecycle maintenance costs. Application: Protective assemblies in demanding electrical distributions. Feature: Large enclosure footprint and substantial weight (149 lb) with dimensions 12.43 in D, 62.97 in H, 28.29 in W. Business Impact: Provides a robust, tamper-resistant control device that stays in place under vibration and harsh conditions. Application: Dedicated switchgear housings and service entrances where secure mounting is essential.
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FAQs
The STS366NW1 is a three-pole device rated for 600 A with 600 Vac/250 Vdc ratings and a 24 Vac coil. When upgrading or retrofitting, verify cabinet clearance for a 62.97 in tall enclosure and ensure mounting provisions align with the 28.29 in width and 12.43 in depth. Use proper lifting gear due to its 149 lb weight and ensure control wiring follows plant safety interlock standards.
The 24 Vac coil enables easy integration with centralized control schemes and PLC/DT networks that drive remote trip signals. This facilitates coordinated protection across feeders and motor control centers, reducing the risk of mis-coordination and enabling faster isolation during faults while maintaining operator safety.
Yes. The enclosure is NEMA 4X and fabricated from 304 stainless steel, delivering excellent corrosion resistance and washdown capability. This makes it well-suited for food processing, chemical processing, and outdoor or humid environments where protection against moisture and contaminants is critical.
The device carries UL Listed and cUL Certified markings, along with a NEMA 4X enclosure. These certifications support compliance in many North American facilities and align with common industrial safety and electrical protection standards, aiding procurement and inspection processes.
The STS366NW1 carries Eaton's warranty of one year from installation or eighteen months from shipment, whichever occurs first. Regular inspections of the enclosure seals, coil integrity, and control wiring, plus periodic functional tests of the trip circuit, help sustain reliability and minimize unforeseen maintenance costs over the asset lifecycle.