Eaton STS368FD3 Shunt Trip Safety Switch - UL Listed
Part Number: STS368FD3
Quick Summary
Eaton STS368FD3 is a heavy-duty shunt-trip safety switch used for motor control and power protection in industrial automation. Manufacturers often struggle with reliable trip protection that fits rugged environments and minimizes downtime from unexpected power events. UL Listed and cUL Certified safety validations provide confidence across global sites, while NEMA 12 and NEMA 3R enclosures protect against dust, moisture, and outdoor exposure. With a 1200 A amperage rating and 600 Vac / 250 Vdc voltage capabilities, this unit supports high-demand loads and diverse control schemes. The 120 Vac coil makes integration straightforward with standard control circuits, delivering improved safety, reduced maintenance, and a clearer path to compliance for critical systems.
Product Information
Extended Description
STS368FD3 Eaton: Eaton Heavy Duty Shunt Trip Safety Switch, Enclosure- NEMA 12, NEMA 3R, Fusible, 1200 A, Three pole, 600 Vac, 250 Vdc
Product Name
Eaton Heavy Duty Shunt Trip Safety Switch
Catalog Number
STS368FD3
UPC
786689314385
Product Length/Depth
23.15 in
Product Height
72.5 in
Product Width
47.23 in
Product Weight
405 lb
Certifications
UL Listed cUL Certified
Enclosure
NEMA 12, NEMA 3R
Number Of Poles
Three-pole
Amperage Rating
1200A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Heavy-duty shunt-trip functionality with a 120 Vac coil enables fast automatic shutdown during fault conditions. This capability reduces arc-flash exposure and protects critical equipment from damage, yielding safer maintenance and shorter unplanned downtime. It integrates with standard control circuits in motor control centers and large feeders, delivering reliable protection with minimal wiring complexity and faster commissioning. Enclosure rated NEMA 12 and NEMA 3R provides dust, moisture and outdoor exposure protection, extending service life in harsh factory floors and outdoor cabinets. The rugged enclosure supports easy mounting in existing frames and aligns with standard panel cutouts, reducing installation time and spare parts inventory. With a 1200 A amperage rating, the STS368FD3 can interrupt high fault currents in large electrical feeders, enabling safe isolation of heavy loads. This capability helps meet utility and plant safety requirements while simplifying coordination with upstream protection devices and fuses. 600 Vac and 250 Vdc voltage ratings support both AC control circuits and DC downstream devices, enabling broader compatibility with diverse plant systems. The 120 Vac coil further simplifies integration with typical control panels, MCCs, and automatic transfer switch configurations. UL Listed and cUL Certified along with fusible protection simplify procurement, documentation and regulatory audits. A three-pole configuration reduces wiring complexity and panel space, while the robust construction minimizes spares, downtime, and maintenance costs over the life of the system.
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FAQs
Install the STS368FD3 in a three-pole configuration inside a NEMA 12/3R enclosure. Ensure the panel cutouts match the device footprint and secure with standard mounting hardware. Connect the 120 Vac coil to the control circuit and wire the fusible protection per the Eaton datasheet. Verify UL Listed and cUL Certified markings and torque specifications for proper operation.
Key specs include a 1200 A interrupt rating, 120 Vac coil voltage, and 600 Vac / 250 Vdc voltage ratings. The device is fusible and three-pole, with UL Listed and cUL Certified validations. Ensure compatibility with your motor control centers, downstream devices, and control voltages, and plan for appropriate short-circuit current ratings in your panel.
Yes. The enclosure is rated NEMA 12 and NEMA 3R, providing dust and moisture protection for indoor and some outdoor installations. It suits harsh factory floors and outdoor cabinets when mounted correctly and wired per code. Pair with compatible connectors and control wiring to maintain protection levels and ensure reliable operation in challenging environments.
UL Listed and cUL Certified indicate recognized safety compliance across North America, supporting procurement, inspections, and documentation. This model’s fusible protection simplifies panel wiring and reduces the need for additional protective components. Use the Eaton datasheet to align with your internal standards, commissioning tests, and regulatory audits. This translates to faster approvals and clearer maintenance records.
Routine maintenance is minimal due to robust construction and long service life, while the fast, reliable fault isolation reduces unplanned downtime. The three-pole design and standard 120 Vac coil simplify stocking and installation, delivering lower total cost of ownership through safer operation, fewer spare parts, and improved plant uptime.