Eaton DSD SR30420 SX178 Selector Switch - Hazardous Locations

Part Number: DSD SR30420 SX178
Eaton Crouse-Hinds logo
Manufacturer
Eaton Crouse-Hinds
Part number
DSD SR30420 SX178
Category

Quick Summary

The DSD-SR selector switch provides reliable control for hazardous-location motor circuits in industrial settings. Operators often contend with switches that fail safety tests, wear out in dusty or explosive environments, or complicate maintenance. This unit carries NEC/CEC compliance with Class I, Division 1 ratings (also Class II, Division 1 and Class III) and NEMA ratings 3, 5, 12, ensuring safe operation in tough environments. Designed for EDS/EFS back-box integration, it supports 600 Vac, 30 A, and a two-position lockout-capable operation, delivering safer, more efficient control. Copper-free aluminum construction contributes to lighter hardware and easier field servicing, improving installation speed and long-term serviceability in demanding facilities.

Product Information

Extended Description

DSD SR30420 SX178 Eaton Crouse-Hinds: Eaton Crouse-Hinds series DSD-SR selector switch, 30A, 1.5 HP/3 HP/5 HP/7.5 HP/10 HP, Copper-free aluminum, 1, Four-pole, 2, Lockout for two position switch, handle in either position, On/Off, 600 Vac, EDS/EFS back boxes
Product Name
Eaton Crouse-Hinds series DSD-SR selector switch
Catalog Number
DSD SR30420 SX178
Product Length/Depth
2.38 in
Product Height
5.875 in
Product Width
3.5 in
Product Weight
1.58 lb
UPC
662276039841
Area classification
Hazardous/Classified Locations
Standards type
NEC/CEC
NEC hazardous rating
Class I, Division 1 Class II, Division 1 Class III
NEMA Rating
3 5 12
Amperage Rating
30A
Voltage rating
600 Vac
Switch function
On/Off
Number Of Poles
Four-pole
Number Of Positions
2
Horsepower
1.50 hp, 3 hp, 5 hp, 7.50 hp, 10 hp
Material
Copper-free aluminum
Number of devices
1
Special features
Lockout for two position switch, handle in either position
Used with
EDS/EFS back boxes
DSD-SR Series Explosionproof HP Rated Selector Switch Sub-assembly catalog page DSD-SR Explosionproof HP Rated Selector Switch Sub-assembly UL certification DSD-SR Explosionproof HP Rated Selector Switch Sub-assembly UL certification Eaton Specification Sheet - DSD SR30420 SX178
30A current rating and 600 Vac capability enable direct motor control in hazardous environments, reducing wiring complexity and cabinet count while maintaining safety in demanding applications such as chemical processing or mining equipment. This leads to lower total installed cost and faster commissioning. The copper-free aluminum housing keeps weight manageable and improves corrosion resistance, easing installation in outdoor or chemically aggressive locations and simplifying field maintenance. The lockout for two-position operation enhances maintenance safety by preventing accidental restarts during servicing, aligning with standard lockout-tagout practices and reducing downtime. EDS/EFS back box compatibility simplifies panel upgrades and substitutions, ensuring quick field retrofits without enclosure redesigns. Certifications and compliance, including NEC/CEC and Class I, Division 1 ratings with NEMA 3/5/12 protections, minimize regulatory risk and supplier audits. The four-pole, two-position On/Off configuration supports flexible control schemes for multi-motor or multi-zone systems, improving overall system reliability and uptime.

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FAQs

The DSD SR30420 SX178 is designed for EDS/EFS back boxes, enabling straightforward insertion into current Eaton Crouse-Hinds enclosures. Its four-pole, two-position design and standard mounting footprint simplify alignment with existing control circuits. This compatibility minimizes rewiring, reduces panel downtime during upgrades, and ensures a secure, code-compliant enclosure interface for hazardous locations.
This selector switch handles up to 30A at 600 Vac, with a four-pole construction and two positions (On/Off). The unit supports a range of horsepower (1.5–10 hp) for compatible motors and is built with copper-free aluminum for lightweight durability. The lockout feature enhances safety during maintenance, preventing unintended operation.
The DSD-SR is intended for use in hazardous/classified locations (NEC/CEC compliant), including Class I Division 1, Class II Division 1, and Class III environments. Common industries include chemical processing, oil & gas, mining, and other heavy industrial settings where equipment safety and reliable On/Off control are critical.
The switch carries NEC/CEC standards with hazardous-location classifications (Class I, Division 1; Class II, Division 1; Class III) and NEMA ratings of 3, 5, and 12. It is designed to operate safely in explosion-hazard zones and is compatible with EDS/EFS back boxes, aligning with industry safety requirements and facilitating regulatory audits.
Benefits include safer maintenance due to lockout capability, reduced downtime from robust hazardous-location ratings, and lighter-weight copper-free aluminum construction for easier field handling. Long-term reliability lowers spare-parts inventory and retrofit costs, while NEC/CEC compliance lowers regulatory risk and accelerates system approvals in regulated environments.