Eaton STS368ND31-1B00 Shunt Trip Safety Switch - UL Listed
Part Number: STS368ND31-1B00
Quick Summary
The Eaton STS368ND31-1B00 heavy-duty shunt trip safety switch is designed for fast, fail-safe shutdown of high-current equipment in industrial panels. Engineers often struggle with reliably isolating equipment during faults while maintaining safe, code-compliant operation. UL Listed and cUL Certified configurations, with NEMA 12 and NEMA 3R enclosure ratings, provide robust protection in harsh environments. This model combines a 1200 A rating with 600 VAC / 250 VDC capability and a 120 VAC coil, enabling seamless integration with modern protection schemes. By including built-in alarm contacts and sensors, it streamlines maintenance and procurement workflows for industrial facilities.
Product Information
Extended Description
STS368ND31-1B00 Eaton: Eaton Heavy Duty Shunt Trip Safety Switch, 1200 A, 600 Vac, 250 Vdc, Three pole , Fusible, NEMA 12, NEMA 3R
Product Name
Eaton Heavy Duty Shunt Trip Safety Switch
Catalog Number
STS368ND31-1B00
UPC
786689314279
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 12, NEMA 3R
Number Of Poles
Three-pole
Amperage Rating
1200A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
Eaton Specification Sheet - STS368ND31-1B00
Feature: 1200 A amperage rating with 600 VAC / 250 VDC maximum voltages. Benefit: Supports large motor loads and heavy equipment while delivering reliable fault isolation, reducing risk of arc flash and equipment damage in power distribution schemes. Application: Ideal for main switchgear and motor control centers in manufacturing plants where high fault current may be encountered. Feature: 120 VAC coil voltage. Benefit: Simplifies integration with standard control circuits and PLC outputs, enabling straightforward actuation from existing control logic. Application: Compatible with typical plant control panels and protection relays to ensure fast, predictable shutdowns. Feature: Three-pole fusible design. Benefit: Provides coordinated protection with selective coordination strategies, lowering total system downtime and maintenance costs. Application: Suitable for multi-line feeders and complex distribution networks that demand robust breaking capacity. Feature: NEMA 12 and NEMA 3R enclosure ratings. Benefit: Delivers dust, moisture, and outdoor resilience, extending service life in challenging environments. Application: Fits indoor switchgear rooms or outdoor outdoor-panel installations exposed to weather and contaminants. Feature: Includes 1NO/NC Alarm Switch, 480V CPT and GF Relay & Sensors. Benefit: Enables integrated fault signaling and auxiliary control signals, reducing wiring complexity and enabling proactive maintenance. Application: Supports centralized monitoring and faster response in automation systems. Feature: UL Listed and cUL Certified. Benefit: Ensures compliance with safety standards and simplifies regulatory approvals for industrial projects. Application: Critical for procurement specifications and customer audits in global operations. Feature: Easy retrofit and compatibility with existing control architectures. Benefit: Shortens commissioning time and minimizes downtime during upgrade projects. Application: Retrofit programs in legacy facilities seeking enhanced protection without major control-system redesign.
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FAQs
Installation requires mounting the three-pole unit within a compliant NEMA 12 enclosure, ensuring proper clearances for wiring and ventilation. Connect the 120 VAC control coil to the plant control circuit, and wire the 600 VAC/250 VDC protected circuits through the fusible contacts. Verify UL/cUL labeling and perform a functional test per Eaton datasheets.
The device is rated for 1200 A, with a voltage rating of 600 VAC and 250 VDC. The coil voltage is 120 VAC, and it is a three-pole fusible safety switch. This configuration supports reliable protection for high-current loads across both AC mains and DC bus interfaces in industrial setups.
Yes, the catalog notes include 480V CPT and GF Relay & Sensors, which supports integration into systems where 480V signaling or sensing is present. While the coil operates at 120 VAC, the switch accommodates high-voltage control and signaling components within the protection scheme, enabling cohesive control and monitoring.
STS368ND31-1B00 is UL Listed and cUL Certified, providing recognized safety compliance across North American installations. This dual certification supports wider procurement acceptance and audits, and it aligns with industrial safety programs that require validated electrical protection products for high-current applications.
The integrated alarm switch and sensors, along with robust enclosure protection, reduce wiring complexity and maintenance labor. The device’s high current rating and fast, reliable shutdown minimize unplanned downtime, extend equipment life, and lower total cost of ownership by simplifying diagnostics, spare-part inventories, and compliance reporting.