Eaton STS366UP31 Shunt Trip Safety Switch - NEMA 4
Part Number: STS366UP31
Quick Summary
Shunt trip safety switch is a critical automatic disconnect device used to protect personnel and equipment in industrial power systems. End users often face nuisance trips, wiring faults, and slow response times that lead to costly unplanned downtime. This Eaton model combines UL Listed and cUL Certified safety with a rugged NEMA 4 painted steel enclosure for harsh environments. With a 600 A rating and 600 Vac capability, it supports reliable protection for motor control centers and control panels, improving safety and uptime. Compact installation and straightforward wiring help streamline procurement while meeting industrial automation requirements.
Product Information
Extended Description
STS366UP31 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
STS366UP31
UPC
786685829333
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: 600 A, three-pole design and 120 Vac coil enable fast, coordinated disconnection in power distribution. Business Impact: reduces fault exposure and equipment damage, enabling safer and more reliable panel operation. Application: ideal for motor control centers and control panels in heavy industry. Feature: NEMA 4 enclosure and painted steel body provide weather and dust resistance. Business Impact: extends service life in harsh environments, lowering maintenance costs. Application: outdoor and damp indoor installations where protection against ingress is required. Feature: 1 NO-1 NC auxiliary alarm switch. Business Impact: enables remote signaling and interlocking for enhanced safety monitoring and shutdown sequencing. Application: safety interlocks and alarm integration in centralized automation racks. Feature: Non-fusible design. Business Impact: simplifies integration with upstream protective devices and reduces arc energy exposure during trips. Application: compatible with common MCC protection schemes and switchgear architectures. Feature: UL Listed and cUL Certified; rugged enclosure design. Business Impact: supports regulatory compliance and smoother procurement processes. Application: industrial control panels across diverse sectors needing verified safety components. Feature: Size and mount compatibility—three-pole configuration with dimensions and weight suitable for retrofit or new installations. Business Impact: minimizes installation complexity and facilitates retrofits in existing enclosures. Application: retrofit projects in MCCs and central control rooms.
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FAQs
For proper installation, mount the unit in a suitable enclosure with adequate space for the three-pole assembly, ensure a secure connection to the 120 Vac coil supply, and wire the 1 NO-1 NC alarm contacts into the control and signaling circuits. Verify NEMA 4 protection suitability for the installation environment and observe torque specifications for lugs and terminals. Plan for accessibility to allow periodic testing and maintenance of the alarm switch and trip mechanism.
Key specifications include a 600 A amperage rating, 600 Vac and 250 Vdc voltage ratings, 120 Vac coil voltage, three-pole design, 1 NO-1 NC contact configuration, a NEMA 4 painted steel enclosure, and non-fusible protection. The unit is UL Listed and cUL Certified, with a weight of approximately 140 lb and dimensions indicating a substantial industrial footprint suitable for MCCs and control panels.
Yes. The three-pole design with a 600 A rating and non-fusible protection is well suited for motor control centers (MCCs) and associated switchgear. Its 120 Vac coil enables straightforward control valve or PLC interface, while the NEMA 4 enclosure offers resilience in harsh or outdoor environments, contributing to safer startup/shutdown sequences and reduced downtime.
The STS366UP31 is UL Listed and cUL Certified, indicating compliance with recognized safety standards across North America. This reduces procurement risk, simplifies regulatory alignment, and supports customer audits. The NEMA 4 enclosure further reinforces environmental protection, making the device suitable for dusty, wet, or outdoor installations.
Eaton provides a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This coverage supports early life reliability and provides a clear basis for field defect claims. For technical support, consult Eaton documentation or contact authorized distributors for replacement parts, mounting guidance, and integration with existing control systems.