Eaton STS366ND3 Shunt Trip Safety Switch - UL Listed
Part Number: STS366ND3
Quick Summary
The Eaton STS366ND3 shunt trip safety switch provides rapid protection for industrial power panels. Engineers often struggle to balance reliable tripping under fault conditions with minimizing nuisance trips in high-load systems. UL Listed and cUL Certified certifications, alongside a NEMA 12/3R enclosure, support compliant, durable installation in demanding environments. Coupled with a 600 A rating and a 120 VAC coil, this device delivers safety with measurable uptime and easy integration into existing power layouts. For panel builders and OEMs, the STS366ND3 simplifies procurement and reduces installation risk with a documented warranty and clear certifications. Its 600 VAC voltage rating and 600 A current handling capability make it suitable for high-energy distribution applications.
Product Information
Extended Description
STS366ND3 Eaton: Eaton Shunt trip safety switch, 600 A, Coil V: 120 Vac, NEMA 12/3R, 600 V, Three-pole, Fusible with neutral
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366ND3
UPC
786685828954
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
Enclosure
NEMA 12, NEMA 3R
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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366ND3
Feature → Business Impact → Application: The STS366ND3’s shunt trip mechanism paired with a 120 VAC coil enables fast, automatic disconnection on control signals, reducing fault duration and protecting downstream equipment. This improves system uptime and safety in switchgear and motor control centers, aligning with protective-device best practices. Feature → Business Impact → Application: The NEMA 12/3R enclosure protects the mechanism from dust, moisture, and incidental impacts, ensuring reliable operation in indoor panels and sheltered outdoor installations. Feature → Business Impact → Application: With 600 A amperage rating and 600 VAC / 250 VDC voltage ratings, STS366ND3 supports large feeders while maintaining tight coordination with upstream protections, reducing the risk of cascading trips. Feature → Business Impact → Application: Three-pole construction simplifies wiring in three-phase systems and accelerates installation in new builds or retrofits, lowering labor costs. Feature → Business Impact → Application: Fusible with neutral configuration provides protective coordination and a straightforward integration path into existing fusible switchgear, improving safety and service life. Feature → Business Impact → Application: UL Listed and cUL Certified status supports regulatory compliance and supplier qualification, easing procurement for North American projects and reducing audit findings. Feature → Business Impact → Application: The combination of warranty and durable construction yields lower maintenance costs and longer mean time between failures, delivering a clear ROI for uptime-critical applications.
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FAQs
Power must be isolated before work. Mount the device in a compatible NEMA 12/3R enclosure, wire the 120 VAC coil to the control circuit, and connect the three-pole terminals per Eaton's STS366ND3 datasheet. During commissioning, verify control signals, proper neutral connection, and fault-signal routing to ensure fast, reliable tripping without nuisance releases.
Amperage rating is 600 A, voltage rating is 600 VAC and 250 VDC, with a control coil of 120 VAC. These specs support high-load distribution and control-signal coordination in protection schemes.
Yes. The device is specified for NEMA 12 and NEMA 3R enclosure types, ensuring dust and moisture protection for indoor and sheltered outdoor installations, simplifying integration with existing panel cabinets.
The product is UL Listed and cUL Certified, indicating compliance with safety standards for North American electrical installations. This streamlines procurement, regulatory approvals, and reduces qualification risk for panel builders and OEMs.
With a robust fusible design, a one-year warranty and a heavy-duty 149 lb enclosure, the STS366ND3 lowers downtime and replacement costs. Its reliability supports longer service intervals and predictable lifecycle planning for uptime-critical protection systems.