Eaton STS368NP31-1B00 Shunt Trip Safety Switch - UL Listed
Part Number: STS368NP31-1B00
Quick Summary
Eaton STS368NP31-1B00 Shunt Trip Safety Switch provides safe power isolation for industrial control panels. Engineers often struggle with reliable tripping coordination, alarm signaling, and installation efficiency in demanding environments. UL Listed and cUL Certified protection, paired with a rugged NEMA 4 enclosure, ensure dependable operation in harsh conditions. Designed for 600 Vac systems and up to 1200 A, this heavy-duty switch integrates a 120 Vac solenoid and a 1NO/1NC alarm switch, plus ground fault relay and CT, delivering comprehensive protection. In practice, this means faster fault response, improved safety compliance, and reduced downtime across power distribution and motor control applications. By aligning with standard control architectures, it also simplifies procurement and spares stocking for maintenance teams.
Product Information
Extended Description
STS368NP31-1B00 Eaton: Eaton Shunt Trip Safety Switch, Heavy Duty, Three-pole, 600Vac, 1200A, Fusible, NEMA 4 (painted steel), 120Vac solenoid, 1NO/1NC Alarm Switch, Ground Fault Relay and CT
Product Name
Eaton Heavy Duty Shunt Trip Safety Switch
Catalog Number
STS368NP31-1B00
UPC
786689314316
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
Catalog Notes
Includes 1NO/NC Alarm Sw, 480V CPT and GF Relay & Sensors
Enclosure
NEMA 4
Number Of Poles
Three-pole
Amperage Rating
1200A
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 - STS368NP31-1B00
Feature: Three-pole, 600 Vac, 1200 A fusible design. Business Impact: Enables reliable, high-current isolation with coordinated interruption, reducing arc flash exposure and unplanned downtime in critical circuits. Application: Main feeders and motor control centers requiring robust safety switching. Feature: NEMA 4 painted steel enclosure. Business Impact: Delivers rugged durability against dust, water ingress, and washdown, extending service life in harsh environments. Application: Outdoor substations and harsh plant floors. Feature: Integrated 1NO/1NC Alarm Switch, Ground Fault Relay and CT. Business Impact: Improves fault signaling, protection coordination, and remote diagnostics, boosting plant safety and operability. Application: Integrated protection schemes alongside supervisory controls. Feature: 120 Vac coil voltage with a 120 Vac solenoid. Business Impact: Simplifies wiring compatibility with standard control circuits, reducing panel wiring time and error potential. Application: Control circuits in new or retrofit installations. Feature: Heavy-duty enclosure size and weight (23.15 in L × 72.5 in H × 47.23 in W; 405 lb). Business Impact: Provides a secure, tamper-resistant footprint suitable for high-current environments, with predictable mounting and clearance requirements. Application: Retrofit or new builds with space planning for safety equipment. Certification & compatibility note: UL Listed and cUL Certified status confirms regulatory compliance and supplier confidence, while catalog notes indicate included alarm switch, 480 V CPT and GF relay & sensors for a ready-to-install solution. Industry context: aligns with electrical protection & circuit control standards and supports reliability targets in industrial automation projects.
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FAQs
The STS368NP31-1B00 is designed for three-pole, high-current isolation in industrial panels. Verify panel space for the large enclosure (NEMA 4) and confirm compatibility with 600 Vac distribution and 120 Vac control circuits. Follow Eaton’s specification sheet for wiring the 120 Vac coil, 1NO/1NC alarm switch, and the integrated ground fault relay and CT. Adequate clearances and proper grounding are essential for safe operation.
Key ratings include a 1200 A amperage rating, 600 Vac voltage rating (also suitable for 250 Vdc), and a 120 Vac coil. The device is fusible-protected and housed in a NEMA 4 enclosure, with three poles. This combination supports high-current, rugged service, with integrated alarm and fault sensing to enhance protection coordination in critical power systems.
Yes. The three-pole, high-current design and fusible protection are well-suited for motor control centers and emergency shutdown circuits in demanding environments. The 1NO/1NC alarm, ground fault relay, and CT enable coordinated protection, while the NEMA 4 enclosure supports outdoor or washdown applications, expanding deployment options in industrial facilities.
This unit is UL Listed and cUL Certified, ensuring compliance with widely adopted North American safety standards. The UL/cUL certifications support regulatory approvals for industrial installations, simplify vendor qualification, and bolster reliability expectations in safety-critical applications across electrical protection and control workflows.
The unit’s integrated alarm switch and fault sensing enhance proactive maintenance by signaling issues early, reducing downtime. Its rugged NEMA 4 enclosure and high-current rating contribute to longer service life in harsh environments, lowering replacement intervals. Downtime reduction and improved safety compliance typically yield favorable total cost of ownership in industrial automation projects.