Eaton STS366NP3 Shunt Trip Safety Switch - UL Listed
Part Number: STS366NP3
Quick Summary
The Eaton STS366NP3 shunt trip safety switch rapidly de-energizes electrical circuits in industrial panels for enhanced machine safety. Maintenance teams struggle to ensure safe shutdown during service without triggering unplanned downtime. This unit carries UL Listed and cUL Certified markings, and its NEMA 4 painted steel enclosure resists moisture and dust in harsh environments. With a three-pole design and a 600 A rating, it provides reliable protection for high-current circuits, while a 120 VAC coil voltage supports straightforward control integration. Designed for OEMs and maintenance teams, it enables compliant safety operations and lowers total cost of ownership through proven reliability and compatibility with standard Eaton devices.
Product Information
Extended Description
STS366NP3 Eaton: Eaton shunt trip safety switch, 600 A, Three pole, 600 Vac, 250 Vdc, 120 Vac, NEMA 4, Painted steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366NP3
UPC
786685829050
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 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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366NP3
Three-pole construction delivers full-phase control and simplifies wiring in industrial control panels, reducing miswiring risk and improving fault isolation. The fusible design adds an extra layer of protection while enabling selective coordination with upstream disconnects, cutting downtime during maintenance windows and supporting 600 VAC service environments in manufacturing floors. The NEMA 4 painted steel enclosure provides reliable protection against dust and moisture, extending service life in harsh environments and reducing enclosure damage in manufacturing plants. The 120 VAC coil voltage offers easy integration with standard control circuits, streamlining PLC or relay logic and minimizing control panel rework during installation. The combination of 600 VAC / 250 VDC voltage ratings with UL Listed and cUL Certified status helps meet regulatory requirements and accelerates audits, while compatibility with Eaton switching devices reduces spare parts inventory and procurement complexity. This rugged design supports quick retrofits in existing switchgear, lowering install time and improving overall equipment uptime. Overall, the STS366NP3 enables safer operations, predictable maintenance schedules, and measurable reductions in field downtime and risk.
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FAQs
Install with the three-pole configuration to ensure proper phase interruption. Mount the unit on a compatible panel or enclosure, connect the 120 VAC coil control circuit, and wire the 600 VAC/250 VDC circuit through the fusible path per the Eaton specification sheet. Verify NEMA 4 sealing and proper torque on mounting hardware to maintain environmental protection and safe operation.
Key specs include a 600 A amperage rating, 120 VAC coil voltage, and voltage protection of 600 VAC / 250 VDC. It is a fusible three-pole device housed in a NEMA 4 painted steel enclosure and UL Listed with cUL Certified markings, suitable for demanding industrial environments.
Yes. The unit uses a NEMA 4 painted steel enclosure designed to resist moisture and dust, making it well-suited for industrial control panels, switchgear, and motor control centers where reliability and environmental protection are required.
UL Listed and cUL Certified markings indicate conformity with recognized safety standards, while the NEMA 4 enclosure provides environmental protection. These certifications support code compliance, safer field installations, and smoother passing of audits in regulated facilities.
The three-pole, fusible design reduces fault exposure and supports selective coordination, minimizing downtime during maintenance. Its rugged enclosure and standard catalog compatibility simplify spares, procurement, and retrofits, delivering lower total cost of ownership through improved reliability, reduced service interruptions, and streamlined compliance documentation.