Eaton STS366ND64 Shunt Trip Safety Switch - UL Listed
Part Number: STS366ND64
Quick Summary
The Eaton STS366ND64 shunt trip safety switch is designed to deliver fast, reliable protection for motor starters in industrial automation. It helps prevent equipment damage and unsafe startups by tripping on fault conditions and signaling through built‑in alerts. Operators often contend with nuisance trips and lengthy shutdowns; this unit offers integrated alarm and auxiliary contacts to streamline monitoring and reduce downtime. The product carries UL Listed and cUL Certified approvals and is built for harsh environments with a NEMA 12/3R enclosure. With a 600 A rating and a 24 Vdc coil, it aligns with heavy-duty protection schemes while supporting compliant, safer plant operation. This solution also supports straightforward maintenance planning and seamless compatibility with Eaton documentation and control systems.
Product Information
Extended Description
STS366ND64 Eaton: Eaton Shunt trip safety switch, 600 A, 1NO/1NC auxiliary contact and 1NO/1NC alarm switch, Coil V: 24 Vdc, NEMA 12/3R, 600 V, Three-pole, Fusible with neutral
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366ND64
UPC
786685829012
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
Auxiliary contacts
Alarm switch
Enclosure
NEMA 12, NEMA 3R
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
600A
Coil voltage
24 Vdc
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 - STS366ND64
Three-pole design provides decisive isolation for high-current lines, delivering immediate protection in motor control centers and large drives, which reduces unplanned downtime and equipment wear. The 600 A amperage rating coupled with a 24 Vdc coil enables reliable actuation from standard control circuits, minimizing wiring complexity and inventory needs while accelerating panel wiring during retrofits. The rugged NEMA 12 and NEMA 3R enclosure protection ensures operation in dusty, moist, or harsh manufacturing environments, improving uptime and extending service intervals. An integrated 1 NO 1 NC auxiliary contact and 1 NO 1 NC alarm switch offers enhanced monitoring and remote signaling for safety interlocks, status monitoring, and rapid fault notification across control systems. With 600 Vac / 250 Vdc voltage ratings, the STS366ND64 fits a broad range of electrical architectures, reducing the need for multiple devices and simplifying engineering. UL Listed and cUL Certified certifications provide regulatory assurance and smoother procurement cycles, supported by Eaton’s comprehensive documentation for installation and maintenance. Industry peers appreciate the plug‑and‑play compatibility with standard MCC panels and Eaton’s flex‑center switching resources, which shorten project timelines and lower lifecycle costs.
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FAQs
Install the STS366ND64 within a compatible three-pole enclosure rated for NEMA 12 or NEMA 3R. Mount securely, connect the line side to the protected circuit, and wire the 24 Vdc coil to the control circuit with appropriate safety clearances. Attach the 1 NO 1 NC auxiliary contact and 1 NO 1 NC alarm switch to the control loop for status signaling, then verify the trip function and reset behavior per the Eaton specification sheet.
The STS366ND64 is a 600 A, three-pole shunt trip safety switch with a 24 Vdc coil. It features a 600 Vac / 250 Vdc voltage rating, fusible with neutral, and offers 1 NO 1 NC auxiliary contact plus 1 NO 1 NC alarm switch. Enclosure options include NEMA 12 and NEMA 3R, suitable for industrial environments. The unit is UL Listed and cUL Certified.
Yes. The three-pole configuration and 600 A rating are ideal for MCC protection, providing rapid isolation of power to motors and drives during fault conditions. The integral alarm and auxiliary contact enable reliable interlocks and remote signaling. Its NEMA 12/3R enclosure supports installation in typical industrial spaces, making it a practical fit for safety circuits and protective schemes in MCCs.
STS366ND64 carries UL Listed and cUL Certified approvals, reflecting compliance with North American safety standards. These certifications facilitate regulatory acceptance for industrial installations and simplify supplier qualification. The device also adheres to enclosure standards (NEMA 12/3R) suitable for dust, moisture, and corrosion‑resistant environments, supporting long‑term reliability in harsh plant conditions.
The STS366ND64 offers predictable, rapid fault isolation which reduces protective downtime and minimizes motor wear from fault conditions. Its robust enclosure and auxiliary signaling improve preventive maintenance planning and remote diagnostics, lowering total cost of ownership. With UL/cUL certifications and Eaton support materials, projects experience smoother commissioning, faster issue resolution, and better compliance outcomes over the device’s lifetime.