Eaton Crouse-Hinds FSQC3390 S4 - Explosionproof Interlock
Part Number: FSQC3390 S4
Quick Summary
FSQC3390 S4 interlocked receptacle with switch is designed for hazardous locations, delivering reliable control of power to magnetic motor starters in heavy industry. In the field, downtime caused by miswiring or noncompliant gear can drain productivity and increase risk; this unit mitigates that with a robust interlock and precise polarity. It carries NEC/CEC compliance and hazardous-location ratings, including Class I, Division 1 and Zone 1 configurations, plus NEMA compatibility to support rugged environments. The combination of copper-free aluminum housing and brass contacts delivers a durable, maintenance-friendly solution. For engineers and procurement teams, it provides a proven path to safer, compliant motor-control assemblies with predictable lifecycle costs.
Product Information
Extended Description
FSQC3390 S4 Eaton Crouse-Hinds: Eaton Crouse-Hinds series Arktite FSQC interlocked receptacle with switch, Through feed, 0.55-0.70" cable diameter, 3-wire, 4-pole, Brass contacts, Copper-free alum, Spring door, Special polarity, 1", For use with magnetic motor starters
Product Name
Eaton Crouse-Hinds series Arktite FSQC interlocked receptacle with switch
Catalog Number
FSQC3390 S4
Product Weight
10.25 lb
UPC
782274416854
Area classification
Hazardous/Classified Locations
Standards type
NEC/CEC
NEC hazardous rating
Class I, Division 1 Class III Class I, Zone 1 Class I, Division 2 Class II, Division 1 Class II, Division 2
NEMA Rating
9 7 12 3
Trade size
1"
Configuration
Three-wire, four-pole
Receptacle style
Spring door
Back box style
Through feed
Cable diameter
0.55-0.70 in
Material
Copper-free aluminum
Contact material
Brass
Special features
Special polarity
Type
For use with magnetic motor starters
SP3D Design Package - Arktite FSQC Explosionproof Interlocked Receptacles
Arktite FSQC Explosionproof Interlock Receptacles catalog page
Arktite FSQC Explosionproof Interlock Receptacles UL certification
Arktite FSQC Explosionproof Interlock Receptacles UL certification
IF 1429A - FSQC - Replacing Collar Assembly
IF 1429A - FSQC - Replacing Collar Assembly
IF 1429A - FSQC - Replacing Collar Assembly
IF 1429A - FSQC - Replacing Collar Assembly
Eaton Specification Sheet - FSQC3390 S4
Feature → Business Impact → Application: Through-feed back box design simplifies field wiring and reduces installation time, lowering labor costs while ensuring consistent enclosure integrity in harsh environments. Application: Through-feed installations in motor control panels and outdoor enclosures in industrial plants. Feature → Business Impact → Application: Cable diameter accommodation of 0.55-0.70 in supports common motor wiring harnesses, enabling flexible terminations without adapters, which cuts inventory complexity. Application: New builds and retrofit projects requiring standard motor starter connections. Feature → Business Impact → Application: Copper-free aluminum housing provides corrosion resistance and lighter weight without sacrificing strength, lowering lifecycle maintenance and shipping costs. Application: Harsh or outdoor hazardous locations where weight reduction improves handling. Feature → Business Impact → Application: Brass contact material delivers durable, high-reliability conductivity, improving uptime in high current motor circuits. Application: Critical power feeds to magnetic motor starters in Class I/II environments. Feature → Business Impact → Application: Three-wire, four-pole configuration ensures correct control and feedback for switch interlock, reducing miswiring events. Application: Safety-interlocked control in hazardous locations. Feature → Business Impact → Application: Special polarity feature prevents incorrect connections, enhancing installation accuracy and Commissioning efficiency. Application: Industry-grade interlocked receptacles for motors and starters. Feature → Business Impact → Application: Spring door receptacle style offers dust and splash protection, improving enclosure integrity. Application: Enclosed electrical spaces subject to debris exposure. Feature → Business Impact → Application: Designed for use with magnetic motor starters, delivering seamless integration with existing control schemes. Application: OEM and end-user panel builds needing reliable interlock functionality.
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FAQs
FSQC3390 S4 supports through-feed back boxes and features a copper-free aluminum housing with brass contacts, designed for Class I/II environments. For safe wiring, follow NEC/CEC guidelines and use the interlock correctly to prevent energizing the motor starter during maintenance.
The unit provides a three-wire, four-pole configuration with a trade size of 1 inch and a cable diameter range of 0.55 to 0.70 inches. Receptacle style is spring door, and it is intended for use with magnetic motor starters in hazardous locations.
Yes. The FSQC3390 S4 is specifically designed for use with magnetic motor starters, providing an interlocked receptacle with switch to safely control motor energization in demanding environments.
It supports NEC/CEC compliance with hazardous-location ratings (Class I, Division 1; Zone 1; Class II, Division 1/2; and related classifications) and NEMA ratings, ensuring code conformity and reliable operation in certified locations.
The interlock reduces miswiring risk and unplanned energization, lowering maintenance downtime. Its durable copper-free aluminum housing and robust electrical contacts extend service life in harsh environments, delivering tangible total-cost-of-ownership advantages for motor-control panels.