Eaton STS367NP34 Shunt Trip Safety Switch UL NEMA 4
Part Number: STS367NP34
Quick Summary
The Eaton STS367NP34 shunt trip safety switch provides reliable interlock control for industrial motor feeders and safety circuits. In busy facilities, nuisance tripping or slow shutdowns can derail production and raise safety risk. UL Listed and cUL Certified with a NEMA 4 enclosure ensure regulatory compliance and rugged performance in harsh environments. Designed for robust electrical protection, this unit delivers 800 A three-pole capacity with 600 Vac/250 Vdc ratings, while the 120 Vac coil supports straightforward integration with standard control networks. It helps engineers reduce downtime and improve maintenance planning by delivering predictable, compliant shutdown behavior. Coupled with Eaton documentation and field support, it accelerates project timelines and ensures consistent performance across shifts.
Product Information
Extended Description
STS367NP34 Eaton: Eaton shunt trip safety switch, 800 A, Three-pole, 600 Vac, 250 Vdc, Alarm switch, Auxiliary contact, 120 Vac, 1 NO 1 NC, NEMA 4, Painted steel, Fusible, 600 V
Product Name
Eaton shunt trip safety switch
Catalog Number
STS367NP34
UPC
786685829890
Product Length/Depth
12.43 in
Product Height
71.72 in
Product Width
29.54 in
Product Weight
170 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
Auxiliary contact
Enclosure
NEMA 4
Enclosure material
Painted steel
Number Of Poles
Three-pole
Type
Shunt trip safety switch
Amperage Rating
800A
Coil voltage
120 Vac
Protection
Fusible
Voltage rating
600 Vac, 250 Vdc
Contact configuration
1 NO 1 NC
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
ARMS Enclosed Circuit Breaker
Eaton Specification Sheet - STS367NP34
Feature: 800 A three-pole construction supports high-demand motor feeds and clean fault isolation. Business Impact: Enables scalable protection for large MCCs, reducing unintended tripping and improving uptime metrics. Application: Suitable for heavy-duty industrial motor control centers and process lines where reliability matters. Feature: 600 Vac / 250 Vdc voltage ratings with a 120 Vac coil enables straightforward interfacing with standard control systems and switchgear, while maintaining safe, fast disconnection. Business Impact: Minimizes control wiring complexity and accelerates commissioning, lowering installation costs. Application: Central control cabinets and safety interlocks in manufacturing environments. Feature: NEMA 4 painted steel enclosure and fusible protection deliver rugged, weather-resistant performance. Business Impact: Prolongs lifecycle in harsh environments and reduces maintenance frequency. Application: Outdoor installations or damp plant floors where protection from dust, water, and corrosion is essential. Feature: Auxiliary contact configuration of 1 NO 1 NC expands monitoring and signaling capabilities. Business Impact: Improves fault indication and remote status reporting for safety interlocks and PLC input logic. Application: Safety circuits and machine interfaces requiring reliable signaling. Feature: Certifications and warranty support (UL Listed, cUL Certified, Eaton warranty) provide regulatory assurance and peace of mind. Business Impact: Simplifies compliance audits and lowers risk of non-conformance. Application: Regulatory-driven facilities and end-user maintenance programs. Feature: Compact compatibility with standard Eaton ecosystem and installation practices. Business Impact: Reduces engineering time and ensures consistent performance across plant lifecycle. Application: Retrofit projects and new installations within existing Eaton systems. Feature: Dimensions and weight (12.43 in depth, 71.72 in height, 29.54 in width, 170 lb) inform space planning and crane-lift considerations. Business Impact: Improves project planning and safety during installation. Application: Large electrical rooms and MCC assemblies where space and handling capacity are known constraints. Feature: Warranty and reliability statement (one-year or 18 months from shipment, per policy) supports long-term budgeting. Business Impact: Predictable maintenance costs and favorable total cost of ownership. Application: Asset management programs and procurement planning.
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FAQs
STS367NP34 is designed for three-pole, high-current motor control centers and pairs with standard Eaton switchgear. Ensure adequate space for its 29.54 in width, 71.72 in height, and 170 lb weight, and plan 120 Vac control wiring for the coil. The unit’s 1 NO 1 NC auxiliary contact supports signaling for PLCs and safety interlocks, streamlining retrofit projects.
Key ratings include an 800 A amperage rating, 600 Vac / 250 Vdc voltage rating, and a 120 Vac coil voltage. It uses a three-pole configuration with 1 NO and 1 NC contact configuration, and provides fusible protection. These specs support robust, code-compliant shutdowns in industrial environments while maintaining control-network compatibility.
Yes. The shunt trip safety switch is designed to rapidly interrupt power in response to a trip signal, making it suitable for machine safety interlocks and emergency shutdown circuits. Its NEMA 4 rating and auxiliary contact support integration with PLCs and safety relays, enabling reliable shutdown sequences essential for safeguarding personnel and equipment.
STS367NP34 is UL Listed and cUL Certified, with a NEMA 4 enclosure. These certifications validate safety, compatibility with North American electrical standards, and resilience in challenging environments. Compliance simplifies audits, supports regulatory requirements, and enhances buyer confidence for industrial installations and maintenance programs.
Maintenance considerations include monitoring the auxiliary contact signaling, verifying enclosure integrity, and periodic inspection of control wiring. The unit’s robust construction and long service life reduce downtime and replacement costs, delivering a favorable return on investment through improved uptime, safer shutdowns, and fewer unexpected outages in demanding manufacturing settings.