Eaton STS366UP34 Shunt Trip Safety Switch - NEMA 4
Part Number: STS366UP34
Quick Summary
The Eaton shunt trip safety switch STS366UP34 provides safe, remote emergency shutoff for electrical panels and motor control centers. End users often struggle with nuisance trips, inconsistent protection, and complex wiring; this device addresses those pain points with a robust three-pole, non-fusible design and a reliable 120 Vac coil. UL Listed, cUL Certified, and housed in a NEMA 4 painted steel enclosure, it is built for harsh environments while meeting stringent safety standards. This combination supports easier commissioning and consistent protection across panel assemblies, delivering real business value through safer operations and reduced downtime. Use it to strengthen panel protection, streamline integration with control circuits, and improve maintenance workflows in industrial settings.
Product Information
Extended Description
STS366UP34 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 120 Vac, 1 NO 1 NC, NEMA 4, Painted steel, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UP34
UPC
786685829340
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
140 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 4
Enclosure material
Painted steel
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
600A
Coil voltage
120 Vac
Protection
Non-Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
1 NO 1 NC
Feature: Three-pole, non-fusible design with 600 A rating and 600 Vac/250 Vdc voltage rating. Business Impact: Delivers robust, high-current protection for critical loads with clear, decisive switching, reducing exposure to arc flash and unintended energization. Application: Motor control centers and disconnects in heavy industry. Feature: Coil voltage of 120 Vac and 1 NO 1 NC auxiliary contacts (alarm switch). Business Impact: Simplifies integration with standard control circuits and enables remote signaling for status monitoring, lowering wiring complexity and enhancing diagnostics. Application: Panel alarms and safety interlock circuits. Feature: NEMA 4 enclosure with painted steel construction. Business Impact: Provides reliable protection against dust, water ingress, and corrosion in both indoor and some outdoor installations, extending service life. Application: Outdoor or rough-environment electrical cabinets. Feature: Certifications and warranty (UL Listed, cUL Certified; 1-year warranty). Business Impact: Ensures regulatory compliance and supplier support, minimizing risk for compliance audits and post-installation issues. Application: Regulated facilities and mission-critical safety installations. Feature: Compatibility with standard Eaton protection devices and control wiring. Business Impact: Accelerates installation, reduces engineering time, and lowers total cost of ownership through familiar components. Application: Panel builder projects and retrofit upgrades.
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FAQs
The STS366UP34 is a three-pole, non-fusible safety switch with a 600 A rating and 600 Vac main voltage, plus a 120 Vac coil and 1 NO 1 NC auxiliary contacts. It fits common panel architectures and can be wired into standard protection schemes, reducing integration effort and ensuring consistent performance across control circuits.
Verify the 600 A amperage rating, 600 Vac main voltage, and 250 Vdc rating, along with coil voltage of 120 Vac. Confirm the contact configuration of 1 normally open and 1 normally closed, and ensure the enclosure is suitable for your environment (NEMA 4). These specs ensure correct protection and reliable operation within your system.
Yes. The device is housed in a NEMA 4 enclosure with painted steel construction, designed to resist dust, water ingress, and certain corrosive conditions. While ideal for indoor protected areas and sheltered outdoor installations, always assess your specific climate and ingress requirements to determine long-term durability.
The STS366UP34 carries UL Listed and cUL Certified markings, indicating compliance with recognized safety standards for electrical protection devices. These certifications help ensure regulatory acceptance, simplify audits, and provide assurance of performance and safety to end users and inspectors.
Expect improved uptime due to reliable, tested protection and straightforward diagnostics through the auxiliary alarm contact. The unit carries a one-year warranty (per Eaton policy 25-000 or 18 months from shipment, whichever occurs first). Aggregated benefits include reduced downtime, safer operations, and lower lifecycle costs in panel protection and emergency shutdown systems.