Eaton Shunt Trip Safety Switch STS366ND34 - UL Listed
Part Number: STS366ND34
Quick Summary
The Eaton shunt trip safety switch enables rapid remote tripping for industrial electrical protection in MCCs and switchgear. Many facilities struggle with coordinating control signals and avoiding nuisance trips that halt production. This unit is UL Listed and cUL Certified, with a rugged NEMA 12/3R enclosure to support reliable installation across indoor and outdoor environments. These certifications, combined with a 600 A rating and 120 V AC coil, help streamline safety compliance while reducing downtime and maintenance costs. In practice, engineers value its integration with other Eaton protection devices for coordinated shutdown and testing workflows.
Product Information
Extended Description
STS366ND34 Eaton: Eaton Shunt trip safety switch, 600 A, 1NO/1NC auxiliary contact and 1NO/1NC alarm switch, Coil V: 120 Vac, NEMA 12/3R, 600 V, Three-pole, Fusible with neutral
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366ND34
UPC
786685828985
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
149 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
600A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
1 NO 1 NC
Feature: 600 A amperage rating with a three-pole interrupt capability. Business impact: Provides robust protection for heavy loads and motors, reducing the risk of arc faults and ensuring reliable shutdown. Application: Suitable as main protection in switchgear and MCC feeders. Feature: 120 Vac coil voltage. Business impact: Facilitates seamless compatibility with standard plant control circuits and PLCs, enabling faster wiring and fewer control adaptations. Application: Ideal for integration with common control relays and automation architectures. Feature: 1 NO 1 NC auxiliary contact and 1 NO 1 NC alarm switch. Business impact: Enables signaling, interlocking, and trip interlock logic, improving visibility and fault management. Application: Used for panel signaling, status indicators, and remote trip coordination. Feature: NEMA 12 and NEMA 3R enclosure. Business impact: Ensures environmental protection for indoor and outdoor installations, lowering enclosure retrofit costs. Application: Suitable for diverse locations with dust, moisture, or incidental exposure. Feature: 600 Vac / 250 Vdc voltage rating with fusible protection and neutral. Business impact: Supports high-voltage safety and fuse-coordination strategies, simplifying compliance and maintenance. Application: Applies to industrial controls and feeders requiring robust voltage handling. Feature: UL Listed and cUL Certified with a weight of 149 lb and dimensions of 12.43 in L, 62.97 in H, 28.29 in W. Business impact: Clear footprint planning for installation teams and accurate panel space calculations. Application: Ideal for retrofit or new installations in upgrade projects and safety-critical systems.
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FAQs
Install the STS366ND34 by wiring the 120 Vac coil to the control power supply and connecting the three-pole power path through the switch. Attach the 1 NO 1 NC auxiliary contacts to your trip logic or interlock circuit, and wire the alarm switch to your monitoring system. Ensure proper clearance for the 149 lb unit and observe the NEMA 12/3R enclosure requirements for installation site protection.
Key specs include an amperage rating of 600 A, coil voltage of 120 Vac, voltage rating of 600 Vac / 250 Vdc, and a fusible protection scheme with neutral. It provides 1 normally open and 1 normally closed auxiliary contact plus an alarm contact, all housed in a three-pole design with NEMA 12 and NEMA 3R enclosures.
Yes. The enclosure is rated for NEMA 12 and NEMA 3R, delivering dust and moisture protection suitable for a range of indoor and outdoor installations. The 600 A capacity supports demanding MCC protection, while the 120 Vac coil allows straightforward integration with conventional plant controls, reducing layout changes and downtime during upgrades.
The STS366ND34 carries UL Listed and cUL Certified markings, confirming adherence to key safety standards. These certifications support regulatory compliance in many industries and facilitate procurement and installation in regulated environments, alongside the rugged NEMA enclosure which further supports reliable operation.
The device helps reduce unplanned downtime by enabling fast, remote shutdown in fault conditions and by signaling through the auxiliary/alarm contacts. Its robust construction and standard 120 Vac control integration simplify maintenance and retrofits, potentially lowering total cost of ownership through improved safety, reduced repair intervals, and easier integration with existing Eaton protection networks.