Eaton STS366FP64 Shunt Trip Safety Switch - UL Listed
Part Number: STS366FP64
Quick Summary
STS366FP64 shunt trip safety switch delivers reliable remote trip control for three-pole safety interlocks in demanding industrial environments. This unit helps prevent equipment damage and protects personnel by ensuring fast, fail-safe tripping under fault conditions. The device supports 600 A, 600 Vac and 250 Vdc with a 24 Vdc coil, while offering 1 NO 1 NC auxiliary contacts and a NEMA 4 enclosure. UL Listed and cUL Certified, it meets essential regulatory requirements and is built in painted steel for durability on harsh shop floors. For engineers and procurement teams, the combination of clear ratings, robust construction, and a straightforward warranty translates to reduced commissioning time and predictable maintenance costs.
Product Information
Extended Description
STS366FP64 Eaton: Eaton shunt trip safety switch, 600 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, 24 Vdc, 1 NO 1 NC, NEMA 4, Painted steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS366FP64
UPC
786685828824
Product Length/Depth
12.43 in
Product Height
62.97 in
Product Width
28.29 in
Product Weight
145 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
UL Listed cUL Certified
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
24 Vdc
Protection
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 - STS366FP64
Feature → Business Impact → ApplicationThree-pole, 600 A rating provides high-current switching with improved safety margins for motor control centers and feeders, reducing trip-related downtime in high-load systems. In practice, this means faster fault isolation and lower maintenance costs in manufacturing lines and packaged electrical assemblies.Coil voltage of 24 Vdc enables seamless interfacing with standard control circuits and PLCs, simplifying control wiring and enabling remote trip control during fault events. This reduces control cabinet complexity while preserving fast response times in safety circuits.Voltage ratings of 600 Vac and 250 Vdc accommodate mixed AC and DC power environments, allowing a single device to support diverse safety interlocks in switchgear and MCCs without extra adapters.NEMA 4 enclosure and painted steel construction deliver weather and dust resistance in plant environments, increasing reliability on the factory floor and reducing corrosion-related failures.Auxiliary contact configuration of 1 NO 1 NC with an alarm switch supports status signaling and PLC/SCADA integration, enabling proactive maintenance and real-time safety monitoring.Fusible protection adds an extra layer of safety by isolating faulty circuits, simplifying fault diagnosis and aligning with industry protection strategies. Certifications UL Listed and cUL Certified reinforce compliance, easing procurement audits and design reviews.
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FAQs
For mounting in standard MCC panels, ensure proper panel cutout clearance and secure mounting of the NEMA 4 enclosure. Wire the 24 Vdc coil to the control circuit with appropriate fuse protection, connect the 1 NO 1 NC contacts for status, and verify alignment with protective interlocks prior to energizing the system.
The device is rated for 600 A, with a voltage rating of 600 Vac and 250 Vdc, and a control coil of 24 Vdc. It provides 1 normally open and 1 normally closed auxiliary contact, with fusible protection for enhanced safety in fault conditions.
Yes, the switch uses a NEMA 4 enclosure with painted steel construction, designed to resist weather and dust intrusion. This makes it appropriate for plant floors and semi-exposed installations where enclosure integrity is critical for safety circuits.
STS366FP64 carries UL Listed and cUL Certified markings, indicating compliance with North American safety standards. These certifications simplify procurement, pass audits more easily, and support regulatory compliance for industrial control panels and switchgear assemblies.
Warranty terms follow Eaton policy 25-000, offering one year from the date of installation or eighteen months from shipment, whichever occurs first. This coverage supports maintenance planning, ensures product reliability, and provides recourse for early-life defects and performance assurance.