Eaton STS367FW31 Shunt Trip Safety Switch - NEMA 4X
Part Number: STS367FW31
Quick Summary
Eaton shunt trip safety switch provides fast, automatic shutdown for motor control centers in industrial environments. This device helps prevent equipment damage and personnel risk by rapidly isolating power when a fault or unsafe condition is detected. It carries UL Listed and cUL Certified approvals and is designed for rugged service in harsh settings, featuring a NEMA 4X stainless steel enclosure. With an 800 A rating, 120 Vac coil, and 1 NO-1 NC auxiliary contacts, it supports reliable control and fault signaling. The durable construction and in-field compatibility support compliant installations, reducing downtime while meeting safety standards and regulatory requirements.
Product Information
Extended Description
STS367FW31 Eaton: Eaton shunt trip safety switch, 800 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 120 Vac, 1 NO-1 NC, NEMA 4X, 304 stainless steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS367FW31
UPC
786685829692
Product Length/Depth
12.43 in
Product Height
71.72 in
Product Width
29.54 in
Product Weight
167 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
800A
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 - STS367FW31
Feature: 800 A amperage rating and three-pole design enable safe switching of large motor loads in MCCs. Business impact: reduces device count, simplifies protection schemes, and minimizes downtime during fault isolation. Application: ideal for industrial motor control centers and heavy machinery that demand high current capacity. This configuration also supports motor overload protection and selective coordination with upstream breakers to improve overall plant safety. Feature: 600 Vac / 250 Vdc voltage ratings with a 120 Vac coil voltage. Business impact: supports panel builders with common plant control voltages, lowering wiring complexity and installation time. Application: new builds and retrofit projects where control power matches standard 120 Vac controls. The coil voltage compatibility improves reliability and reduces mis-wiring risk, enabling faster commissioning. Feature: NEMA 4X enclosure in 304 stainless steel. Business impact: delivers superior corrosion resistance and washdown compatibility, extending service life in harsh environments. Application: food processing, pharmaceutical, and outdoor installations requiring durable enclosures. The material choice also supports cleanability and long-term cosmetic integrity in industrial facilities. Feature: Alarm switch auxiliary contact (1 NO-1 NC) for remote signaling and interlocking. Business impact: improves diagnostics, fault indication, and interlock safety without added control hardware. Application: safety interlocks, remote alarms, and PLC signaling. This capability enables quick integration with plant SCADA systems for proactive maintenance. Feature: Fusible protection with 600 V rating. Business impact: provides integrated fault isolation and protection against short circuits, reducing lead times for service and maintenance. Application: protective switching in high-energy circuits for critical loads. The combination with 800 A rating supports high-availability machinery while simplifying panel design. Feature: Certifications and warranty. Business impact: UL Listed, cUL Certified credibility and a one-year warranty from installation (or 18 months from shipment) give users confidence and compliance backing. Application: any installation requiring certified protection devices and documented support. Field notes from installers confirm dependable performance in tough environments.
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FAQs
Yes. The STS367FW31 is a three-pole shunt trip unit rated for 800A with a 120 Vac control coil, designed to fit typical MCC panel cutouts and wiring schemes. Its NEMA 4X enclosure supports rugged installations and UL/cUL certified compliance.
Key specs include 800A amperage rating, three-pole construction, 600 Vac / 250 Vdc voltage rating, 120 Vac control coil, and 1 NO-1 NC auxiliary contacts (alarm switch). Enclosure is 304 stainless steel with NEMA 4X rating.
Ideal for motor control centers, panel boards, and protection schemes in industrial facilities requiring rapid isolation, fault signaling, and reliable secondary contacts for alarms or interlocks.
UL Listed and cUL Certified status confirm adherence to safety and performance standards. NEMA 4X enclosure and 304 stainless steel construction support washdown environments and outdoor installations, aiding regulatory compliance.
The device reduces downtime by delivering fast, reliable disconnect under fault, lowers arc-flash risk, and simplifies maintenance with durable stainless steel construction. It ships with a one-year warranty from installation or eighteen months from shipment.