Eaton STS366NP31 Shunt Trip Safety Switch - UL Listed
Part Number: STS366NP31
Quick Summary
Eaton shunt trip safety switch enables immediate isolation of power to critical loads in industrial control panels. Many projects struggle with accidental restarts, false trips, and costly downtime during fault conditions. This device delivers reliability with cUL Listed, UL Certified, and NEMA 4 enclosure ratings. Designed for engineers seeking safety compliance and operational efficiency, it integrates smoothly with Eaton and compatible control circuits. Its 600 A rating and 600 Vac / 250 Vdc capabilities support high-demand motor and switchgear applications while maintaining a safe shutoff under fault. Installation is straightforward in NEMA 4 enclosures with painted steel construction, reducing field complexity and service time.
Product Information
Extended Description
STS366NP31 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
STS366NP31
UPC
786685829067
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
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 - STS366NP31
Feature: Three-pole construction delivers a 600 A amperage rating and 600 Vac / 250 Vdc potential. Business Impact: Ensures fast, dependable fault isolation to protect personnel and equipment, reducing unplanned downtime. Application: Ideal for motor control centers and switchgear in demanding industrial environments. Feature: NEMA 4 enclosure with painted steel construction. Business Impact: Provides rugged protection against dust, water and washdown, lowering maintenance costs and downtime. Application: Outdoor or harsh environment installations where reliability matters. Feature: Alarm switch auxiliary contact (1 NO-1 NC). Business Impact: Enables remote signaling to PLC/SCADA systems, improving diagnostics and supervisory control. Application: Process lines requiring safety interlocks and alarms. Feature: Coil voltage of 120 Vac. Business Impact: Simplifies wiring by aligning with standard control circuits, reducing panel complexity. Application: Common control panels and Eaton-compatible control architectures. Feature: Certifications cUL Listed and UL Listed. Business Impact: Verifiable regulatory compliance and procurement confidence, easing audits. Application: Compliance-focused projects across manufacturing and infrastructure. Feature: Warranty and service terms. Business Impact: Reduces risk during commissioning and operation with defined coverage. Application: Project handover, maintenance planning, and long-term ownership.
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FAQs
Install the three-pole device in a suitable enclosure, connect the 120 Vac coil to the control circuit, and wire the 1 NO-1 NC auxiliary contact for signaling. Ensure the unit is mounted in a NEMA 4 enclosure and rated for up to 600 A with 600 Vac / 250 Vdc. Verify compatibility with existing Eaton control circuits and follow the manufacturer’s installation sheet.
The STS366NP31 provides a 600 A amperage rating and supports 600 Vac / 250 Vdc voltage ratings. It includes an alarm switch (1 NO-1 NC) for signaling and a 120 Vac coil, enabling rapid and reliable fault isolation in protecting gear and personnel.
Yes. The unit is designed with a NEMA 4 painted steel enclosure, offering protection suitable for indoor and outdoor installations, including washdown or dusty environments commonly found in motor control centers and switchgear.
STS366NP31 carries cUL Certified and UL Listed certifications, signaling compliance with recognized safety standards. These certifications simplify procurement, auditing, and regulatory compliance for industrial automation projects.
The product includes a one-year warranty from installation (or eighteen months from shipment, whichever comes first). The robust NEMA 4 enclosure and solid 600 A rating contribute to reduced maintenance and downtime, supporting predictable total cost of ownership in high-demand applications.