Eaton STS367FD31 Shunt Trip Safety Switch - UL Listed
Part Number: STS367FD31
Quick Summary
The Eaton STS367FD31 shunt trip safety switch provides robust protection for motors and switchgear in industrial control panels. This device helps prevent equipment damage by enabling rapid, external-tripping action in fault conditions, reducing downtime and repair costs. It carries cUL Certified and UL Listed marks, with a tough NEMA 12/3R enclosure for indoor and outdoor applications, respectively. In addition to its primary 800 A rating and 120 V AC coil, the unit is designed for high-reliability operation in demanding environments, delivering longer service life and easier maintenance for busy facilities. This combination of protection, certification, and installation versatility supports safer, compliant, and cost-effective control panel design and operation.
Product Information
Extended Description
STS367FD31 Eaton: Eaton Shunt trip safety switch, 800 A, 1NO/1NC alarm switch only, Coil V: 120 Vac, NEMA 12/3R, 600 V, Three-pole, Fusible without neutral
Product Name
Eaton shunt trip safety switch
Catalog Number
STS367FD31
UPC
786685829517
Product Length/Depth
12.43 in
Product Height
71.72 in
Product Width
29.54 in
Product Weight
167 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
cUL Certified UL Listed
Auxiliary contacts
Alarm switch
Enclosure
NEMA 12, NEMA 3R
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
800A
Coil voltage
120 Vac
Protection
Fusible without neutral
Voltage rating
600 V
Contact configuration
1 NO/NC
Double Up on Safety
Double Up on Safety
Double Up on Safety
Eaton Specification Sheet - STS367FD31
Selling Policy 25-000 - Distribution and Control Products and Services
Feature → Business Impact → Application: The STS367FD31 delivers an 800 A current rating with a 120 V AC coil, enabling quick isolation of large three-phase loads and reducing arc flash exposure for operators. This translates to lower downtime and improved overall equipment effectiveness (OEE) in heavy manufacturing and process industries. Application: MCCs and motor control panels in steel, chemical, and water treatment facilities benefit from reliable fault isolation without compromising control logic. Feature → Business Impact → Application: The three-pole design with 1 NO/1 NC alarm contact provides local signaling and remote monitoring capability, enhancing safety interlocks and condition-based maintenance programs. Application: Integrated safety systems in packaging lines and conveyor networks gain improved visibility and faster root-cause analysis during faults. Feature → Business Impact → Application: NEMA 12/3R enclosure options offer rugged protection against dust, moisture, and incidental weather exposure, minimizing enclosure failures and reducing service calls. Application: Indoor plant rooms and protected outdoor panels in mining and utilities rely on durable enclosures for long-term reliability. Feature → Business Impact → Application: The fusible without neutral and 600 V voltage rating simplify integration with existing protection schemes, lowering panel redesign costs while maintaining safe shutdown sequences. Application: New builds and retrofits in electro-mechanical systems benefit from straightforward compatibility with standard control components. Feature → Business Impact → Application: The included warranty and certifications (cUL, UL Listed) reduce procurement risk and streamline compliance documentation. Application: Procurement teams in automotive, food & beverage, and oil & gas environments can justify lifecycle costs with clearly documented standards and support. Industry insight: In high-demand production lines, shunt trip safety switches like the STS367FD31 are favored for their fast response, predictably repeatable operation, and straightforward integration with Eaton-coordinated protection schemes, delivering measurable improvements in safety, uptime, and total cost of ownership.
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FAQs
The STS367FD31 is designed for three-phase motor control and protection in MCCs and control panels. It integrates with standard 120 VAC coil signaling, NEMA 12/3R enclosures, and 600 V assemblies, making it suitable for industrial environments and retrofit projects. Compatibility with existing Eaton protection schemes simplifies large-scale panel upgrades.
A shunt trip safety switch receives an external electrical signal to energize the coil, triggering rapid disconnection of the connected circuit. In a three-phase system, this ensures synchronized tripping of the protective device, minimizing arc exposure and protecting personnel and equipment during fault or overload conditions.
Yes. The STS367FD31 carries UL Listed and cUL Certified markings, confirming compliance with recognized safety and performance standards. This dual certification supports global procurement, simplifies regulatory documentation, and enhances confidence in meeting strict industrial safety requirements.
Installation requires mounting in a NEMA 12 or NEMA 3R enclosure to meet dust and moisture protection needs. Ensure a 120 VAC control coil supply and proper wiring to the 1 NO/NC alarm contact. Adhere to manufacturer torque recommendations and ensure compatibility with existing protective relays and MCC circuitry.
Expected ROI stems from reduced unplanned downtime, faster fault isolation, and improved personnel safety. The 800 A rating and robust enclosure options reduce maintenance costs and extend equipment life. Widespread certification support and compatibility with standard electrical protections further lower lifecycle costs and simplify compliance reporting.