Eaton STS366FP31 Shunt Trip - NEMA 4
Part Number: STS366FP31
Quick Summary
The Eaton STS366FP31 Shunt Trip Safety Switch rapidly interrupts power in motor controls and industrial cabinets. For engineers wrestling with nuisance trips and unpredictable shutdowns, this device provides dependable control and faster fault isolation. UL Listed and cUL Certified with a NEMA 4 painted steel enclosure, it supports safe, compliant operation in rugged environments. Designed for heavy-duty panels, it also aligns with 600 A protection and 120 Vac coil requirements to optimize safety and uptime. Its three-pole design and alarm contact support safe, code-compliant integration with existing control circuits. In modern facilities, this switch translates to measurable uptime gains and reduced risk of arc faults.
Product Information
Extended Description
STS366FP31 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 120 Vac, 1 NO-1 NC, NEMA 4, Painted steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366FP31
UPC
786685828787
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
145 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
Auxiliary contacts
Alarm switch
Enclosure
NEMA 4
Enclosure material
Painted 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
Contact configuration
1 NO-1 NC
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366FP31
Feature: 600 A amperage rating for heavy motor loads. Business Impact: enables reliable protection with fewer nuisance trips and safer startup sequences, reducing downtime. Application: ideal for main feeders in industrial panels and power distribution blocks with high inrush currents. Feature: 120 Vac coil voltage. Business Impact: simplifies control circuit interface using standard plant controls, lowering wiring complexity. Application: compatible with PLC and control-relay architectures across manufacturing lines. Feature: NEMA 4 painted steel enclosure with fusible protection. Business Impact: provides weatherproof, dust-tight protection and safer shutdown in harsh environments. Application: suitable for indoor/outdoor control cabinets and washdown areas. Feature: Alarm switch (1 NO-1 NC). Business Impact: enables proactive fault signaling to PLCs/SCADA, improving maintenance planning. Application: integrates with plant monitoring to trigger alarms on fault events. Feature: UL Listed and cUL Certified with a three-pole design. Business Impact: confirms safety compliance and simplifies integration with Eaton-compatible control systems. Application: ideal for code-compliant installations in North American facilities.
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FAQs
Install the three-pole switch in a suitable panel with the provided mounting supports, ensuring adequate clearance for a 12.43 in depth, 28.29 in width footprint and a 62.97 in height. Pre-wire the 120 Vac coil control and connect the 600 A main circuit, while wiring the 1 NO-1 NC auxiliary contact for alarms. Plan for the 145 lb weight and verify panel strength and mounting hardware compatibility.
Key specs include a 600 A amperage rating, 600 Vac / 250 Vdc voltage rating, and a 120 Vac coil. The device is three-pole with 1 NO-1 NC auxiliary contact and provides fusible protection. It uses a NEMA 4 enclosure, is painted steel, and carries UL Listed and cUL Certified safety marks for reliable, code-compliant operation.
Yes. The STS366FP31 is designed with a NEMA 4 painted steel enclosure and fusible protection, making it appropriate for indoor and outdoor industrial cabinets, washdown areas, and other harsh environments. This rugged construction supports reliable performance even in challenging conditions while maintaining safety and control integrity.
The STS366FP31 is UL Listed and cUL Certified, indicating compliance with recognized safety standards for electrical protection devices. These certifications support code-compliant installations in North America and provide assurance to engineers, procurement teams, and operators that the device meets essential safety requirements for protective switching.
Warranty guidance follows Eaton policy 25-000: one year from date of installation or eighteen months from date of shipment, whichever occurs first. Routine maintenance should follow standard protective-switch maintenance practices. Its rugged, high-capacity design supports longer intervals between inspections while maintaining reliable trip performance and fast fault signaling through the alarm contact.