Eaton STS368ND33-1C00 Shunt Trip Safety Switch - UL Listed
Part Number: STS368ND33-1C00
Quick Summary
The Eaton shunt trip safety switch automatically interrupts power in motor control centers. This reduces nuisance trips and unplanned downtime by delivering fast, targeted shutdown on fault signals. Key safety certifications include UL Listed and cUL Certified, with rugged NEMA 12 and NEMA 3R enclosures for harsh environments. In addition to protection, it supports compliance goals and maintenance efficiency for industrial automation projects. Engineers and procurement teams gain reliability and confidence when specifying this module for high-current switching.
Product Information
Extended Description
STS368ND33-1C00 Eaton: Eaton shunt trip safety switch, with AFGF relay, 1200 A, Three-pole, 600 Vac, 250 Vdc, 120 Vac, 2NO-2NC, NEMA 12, NEMA 3R, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS368ND33-1C00
UPC
786689369743
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 2NO/2NC Aux Con, 480V CPT, AER/GF Relay & Sensors
Enclosure
NEMA 12, NEMA 3R
Number Of Poles
Three-pole
Type
Shunt trip safety switch w/ AFGF relay
Amperage Rating
1200A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
2NO-2NC
Double Up on Safety
Double Up on Safety
Double Up on Safety
Eaton Specification Sheet - STS368ND33-1C00
Three-pole construction with a 1200 A rating enables clean, decisive disconnection of heavy loads in motor control centers. This reduces arcing and wear on primary protection devices, preserving system integrity in high-demand startup applications. The 120 Vac coil and available 2NO-2NC auxiliary contacts with an AFGF relay provide flexible control signals and status feedback, simplifying PLC integration and safety interlocks on conveyors and packaging lines. With a voltage profile of 600 Vac / 250 Vdc, the switch supports both AC and DC control circuits, ensuring compatibility across legacy and modern switchgear. The rugged enclosure options—NEMA 12 and NEMA 3R—protect against dust, moisture, and outdoor exposure, reducing maintenance. Catalog notes add 2NO/2NC aux con, 480V CPT, and sensors, lowering spare-part needs and installation time. UL Listed and cUL Certified ratings reinforce regulatory compliance and risk management for plant owners.
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FAQs
For installation, plan for a three-pole arrangement with a compatible feeder and control wiring. Use the 2NO-2NC auxiliary contacts to feed status back to the safety PLC or interlock circuit. Ensure the enclosure is mounted in a clean, dry location (NEMA 12) or protected outdoor area (NEMA 3R). Verify coil voltage compatibility with the control supply (120 Vac) and observe 600 Vac / 250 Vdc ratings for circuit wiring.
The device is rated for 1200 A with a three-pole 2NO-2NC contact configuration. Coil voltage is 120 Vac, and the permissible main circuit voltages are 600 Vac and 250 Vdc. It includes an AFGF relay and offers auxiliary Con options, with 2NO/2NC auxiliary contacts for signaling and interlock integration in control systems.
Yes. The three-pole design and 1200 A rating are tailored for high-current MCC protection. Its NEMA 12/3R enclosure variants suit indoor and outdoor environments, and the UL Listed / cUL Certified status supports compliance in emergency shutdown circuits and routine safety interlocks in automated facilities.
The STS368ND33-1C00 carries UL Listed and cUL Certified markings, indicating compliance with recognized safety and performance standards. These certifications reduce regulatory risk, facilitate acceptance in procurement specifications, and support audits in industries such as manufacturing and process facilities where safety interlocks and protective switching are mandatory.
The device minimizes downtime by delivering fast, reliable fault isolation, reducing the likelihood of cascading faults in MCCs. Its robust NEMA-rated enclosures and fusible protection simplify maintenance planning, while auxiliary signaling (2NO-2NC) improves fault diagnostics and trim-down in spare-parts inventory, delivering lower lifecycle costs and higher system availability.