Eaton STS368FP33 Shunt Trip Safety Switch - UL Listed NEMA 4
Part Number: STS368FP33
Quick Summary
Eaton STS368FP33 Shunt Trip Safety Switch provides reliable fault protection for industrial switchgear applications. Engineers often wrestle with rapid, safe isolation without sacrificing uptime in harsh environments. UL Listed and cUL Certified ratings, along with a rugged NEMA 4 enclosure, meet critical safety and regulatory requirements. Designed for heavy-duty power circuits, it integrates seamlessly with industrial automation and electrical protection & circuit control. By combining high current handling with robust safety features, it reduces installation time and supports compliance initiatives. This configuration is well-suited for manufacturing lines, packaging equipment, and critical power distribution panels where safe shutdown matters.
Product Information
Extended Description
STS368FP33 Eaton: Eaton Heavy Duty Shunt Trip Safety Switch, Fusible, NEMA 4, 1200 A, Three-pole, 600 Vac, 250 Vdc
Product Name
Eaton Heavy Duty Shunt Trip Safety Switch
Catalog Number
STS368FP33
UPC
786689314224
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 4
Number Of Poles
Three-pole
Amperage Rating
1200A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Three-pole fusible shunt-trip design enables fast isolation of heavy current circuits. This delivers a measurable business impact by reducing arc flash exposure and shortening downtime during faults. It is particularly suited for motor control centers, machine safeguarding, and industrial switchgear where reliable isolation matters for personnel safety and equipment uptime. 1200A amperage rating supports high fault currents without oversizing downstream devices. Business impact: lowers total cost of ownership by reducing the number of devices in the protection chain and improving system reliability. Application: suitable for heavy equipment lines, presses, and conveyors in demanding facilities, including food & beverage, packaging, and metal stamping. 120 Vac coil voltage enables direct control from standard control circuits and PLC outputs. Business impact: simplifies wiring, minimizes control panel footprint, and improves response times. Application: control panels and safety interlocks in automated lines, with straightforward wiring to PLC outputs. NEMA 4 enclosure provides weatherproof, dust-tight protection for indoor and outdoor installations. Business impact: lowers maintenance and replacement costs in wash-down or dusty environments. Application: outdoor switchgear, protected plant rooms, and challenging manufacturing environments including wash-down zones. UL Listed and cUL Certified with fusible protection and defined voltage ratings. Business impact: ensures compliance with global safety standards and streamlines procurement for regulated facilities. Application: suitable for instruments, panels, and assemblies requiring recognized components in safety-critical systems across global sites. Ready for quick integration with Eaton accessories and standard panel hardware. Business impact: accelerates commissioning, reduces field errors, and supports scalable protection schemes. Application: new builds and retrofits across industrial automation and power distribution projects, with compatibility for standard enclosure options.
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FAQs
The STS368FP33 is a three-pole fusible safety switch rated for 1200 A, with a 120 Vac coil voltage for control signaling. It protects circuits up to 600 Vac and 250 Vdc, enabling direct integration with standard control panels and PLC outputs. Its robust ratings support reliable isolation in high-power industrial environments.
Yes. The unit uses a NEMA 4 enclosure designed to resist dust, water ingress, and wash-down conditions typical of rugged industrial settings. For outdoor deployments, ensure proper mounting and adherence to installation guidelines. The enclosure and construction minimize maintenance and extend service life in challenging environments.
When a control signal energizes the 120 Vac coil, the shunt-trip mechanism releases the contacts to interrupt power to the protected circuit. This provides rapid isolation during faults. The device can be used in conjunction with fusible protection to ensure a safe, compliant shutdown of high-current loads in industrial systems.
This unit is UL Listed and cUL Certified, confirming compliance with recognized safety standards for North American and international markets. These certifications simplify procurement in regulated facilities and support audits. Paired with a NEMA 4 enclosure, the STS368FP33 aligns with code requirements for reliable protection in diverse environments.
Plan for a three-pole installation with a 120 Vac coil and a protected circuit rated up to 600 Vac / 250 Vdc. Verify panel mounting compatibility with Eaton accessories and standard wiring practices. Allocate space for the 23.15 in depth, 72.5 in height, and 47.23 in width enclosure. This approach accelerates commissioning and reduces field errors.