Eaton STS366UD34 Shunt Trip Safety Switch - cUL Listed
Part Number: STS366UD34
Quick Summary
Eaton shunt trip safety switch is a protective device designed to rapidly de‑energize equipment in safety‑critical applications within industrial control panels. Engineers often struggle with nuisance trips, slow remote signaling, and integration challenges in control wiring—this unit addresses those pain points with a reliable trip mechanism and built‑in alarm contact. UL Listed and cUL Certified provide strong regulatory confidence, while NEMA 12 and NEMA 3R enclosures offer robust protection against dust, moisture, and weather exposure. With a 600 A rating and voltage versatility across 600 Vac and 250 Vdc, the STS366UD34 delivers tangible business value through improved safety, uptime, and reduced maintenance costs for motor control centers and switchgear installations.
Product Information
Extended Description
STS366UD34 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 120 Vac, 1 NO 1 NC, NEMA 12, NEMA 3R, Non-Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366UD34
UPC
786685829258
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 12, NEMA 3R
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
Switching Devices Flex Center
Switching Devices Flex Center
Switching Devices Flex Center
Eaton Specification Sheet - STS366UD34
Feature → Business Impact → Application: The STS366UD34 delivers 600 A capacity with a three‑pole construction, enabling rapid, reliable shutdown on fault signals and reducing arc flash risk in high‑demand MCCs and switchgear. This supports safer operation and minimized downtime in heavy industrial environments, especially where motors and drives demand robust protection. Feature → Business Impact → Application: A 120 Vac coil voltage allows straightforward integration with standard control circuits and PLC I/O, simplifying wiring and enabling remote trip signaling for centralized protective schemes in automation projects. Feature → Business Impact → Application: The non‑fusible protection design streamlines maintenance and part replacement, lowering lifecycle costs and improving equipment availability in critical production lines. Feature → Business Impact → Application: NEMA 12 and NEMA 3R enclosure ratings provide versatile mounting options, protecting the switch from dust, moisture, and incidental exposure, ideal for indoor plant areas and moderate outdoor locations. Feature → Business Impact → Application: The integral alarm contact (auxiliary) offers real‑time status signaling to SCADA or building management systems, supporting proactive maintenance and traceable safety events. Feature → Business Impact → Application: UL Listed and cUL Certified compliance helps facilities meet regulatory requirements and supplier QA standards, reducing commissioning risk and accelerating project timelines.
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FAQs
STS366UD34 is a 3-pole, non-fusible shunt trip device rated at 600 A with a 120 Vac coil, designed for straightforward integration into Eaton‑style control panels and MCCs. It supports 1 NO 1 NC contact configuration and is suitable for control circuits that require remote trip signaling and alarm feedback, simplifying retrofit projects and ensuring consistent protection across gear.
Key specs include a 600 A amperage rating, 600 Vac / 250 Vdc voltage ratings, and a 120 Vac coil voltage. The device provides 1 NO 1 NC contact configuration, and is non‑fusible. Verify enclosure suitability (NEMA 12/NEMA 3R) for the installation environment and confirm the available control power supply can drive the 120 Vac coil without impacting other systems.
Ideal for motor control centers, switchgear, and industrial control panels where remote trip capability and alarm signaling are essential. The three‑pole design and high current rating support reliable protection for heavy motors and drives, while the NEMA enclosure options enable flexible indoor and outdoor placements with appropriate environmental protection.
The STS366UD34 is UL Listed and cUL Certified, meeting international electrical protection standards. These certifications help ensure compliance with safety requirements in diverse markets, reduce commissioning risk, and simplify procurement with a proven, audit‑ready safety device for critical applications.
With a robust 600 A rating and reliable 120 Vac coil operation, the unit reduces unplanned downtime by enabling fast, remote tripping and clear alarm signaling. The non‑fusible design minimizes maintenance complexity, while UL/cUL compliance and durable NEMA enclosures lower long‑term service costs and extend service intervals in demanding industrial environments.