Eaton STS366NP34 Shunt Trip Safety Switch - UL Listed
Part Number: STS366NP34
Quick Summary
The Eaton shunt trip safety switch enables rapid remote shutdown for heavy electrical systems in manufacturing. Maintenance teams often struggle to guarantee dependable fault isolation without risking line personnel in challenging environments. UL Listed and cUL Certified with a NEMA 4 enclosure support reliable operation in dusty, damp, or outdoor locations. Designed for 600 A circuits and 120 Vac coils, it complements protection schemes while delivering measurable uptime and compliance. This combination supports scalable protection across multi-bus configurations, with a 1 NO 1 NC alarm contact for interlock signaling. Its compact footprint and straightforward wiring simplify installation, reducing commissioning time and enabling faster safety shutdown deployment.
Product Information
Extended Description
STS366NP34 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, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366NP34
UPC
786685829074
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 4
Enclosure material
Painted steel
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: Three-pole design with 1 NO 1 NC auxiliary contact. Business Impact: Enables coordinated interlock signaling and enhanced fault isolation across multi-pole protection schemes. Application: Ideal for large motor control centers and process lines where reliable remote shutoff is essential. Feature: 600 A amperage rating. Business Impact: Supports high-load circuits without nuisance trips, reducing equipment wear and downtime. Application: Main feeders and heavy-duty feeders in manufacturing environments. Feature: 120 VAC coil voltage. Business Impact: Simplifies integration with standard control circuits, lowering wiring complexity and commissioning time. Application: Control panels and safety interlocks in new or retrofit installations. Feature: Voltage rating of 600 VAC / 250 VDC. Business Impact: Enables safe operation across mixed AC/DC safety circuits, improving system versatility. Application: Mixed-power distribution and safety interlocks in industrial plants. Feature: NEMA 4 enclosure in painted steel. Business Impact: Delivers robust protection against dust, moisture, and wash-down, extending service life in harsh environments. Application: Outdoor or semi-enclosed applications in food processing, manufacturing, and water treatment. Feature: Certifications UL Listed and cUL Certified. Business Impact: Supports regulatory compliance and smooth procurement with recognized safety standards. Application: Enterprise approvals and supplier qualification processes. Feature: Alarm switch integration. Business Impact: Provides immediate interlock signaling for fast fault visibility and integration with alarm systems. Application: Plant safety monitoring and control room signaling. Feature: Fusible protection option in the rating. Business Impact: Adds an extra layer of protection against short circuits, reducing arc flash risk and equipment damage. Application: Critical power circuits requiring enhanced protection in high-energy environments.
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FAQs
The STS366NP34 is designed for three-pole installation with a 1 NO 1 NC auxiliary contact. Mount it on a compatible panel with standard termination methods, wire the 120 VAC coil to the control circuit, and ensure the NEMA 4 enclosure seals are intact. Confirm coil polarity and use UL-listed terminations to guarantee reliable remote trip signaling.
Key specs include a 600 A amperage rating, 120 VAC coil voltage, and voltage ratings of 600 VAC / 250 VDC. Contact configuration is 1 NO 1 NC, with an auxiliary alarm switch. Enclosure is NEMA 4 made from painted steel, suitable for harsh environments, and certifications include UL Listed and cUL Certified.
Yes. The STS366NP34 uses a NEMA 4 enclosure built from painted steel, designed to resist dust, moisture, and wash-down conditions. This makes it appropriate for outdoor or semi-exposed installations and harsh indoor environments, provided proper mounting and sealing practices are followed.
The device is UL Listed and cUL Certified, ensuring compliance with widely recognized safety and performance standards. These certifications support procurement, regulatory compliance, and risk mitigation in industrial installations.
Using a shunt trip safety switch like the STS366NP34 reduces downtime by enabling rapid, remote shutdown during faults and protects personnel. The warranty terms (one year from installation or eighteen months from shipment) support total cost of ownership, while the robust NEMA 4 enclosure minimizes field maintenance and replacements in tough environments.