Eaton DSD SR30120 SX178 Selector Switch - Class I, Division 1
Part Number: DSD SR30120 SX178
Manufacturer
Eaton Crouse-Hinds
Part number
DSD SR30120 SX178
Quick Summary
The selector switch provides On/Off control for hazardous-location equipment. This design addresses common maintenance challenges by enabling safe lockout and clear control in live environments. Certified for NEC/CEC hazardous locations, it supports Class I Division 1, Class II Division 1, and Class III applications, along with NEMA 12, 5, and 3 protection. By integrating with EDS/EFS back boxes, it simplifies mounting and wiring while meeting rigorous safety standards. The solution delivers reliable operation in harsh industrial settings, helping facilities improve uptime, regulatory compliance, and overall process safety. Secondary value is realized through compatibility with common industrial controls and straightforward integration into existing control circuits.
Product Information
Extended Description
DSD SR30120 SX178 Eaton Crouse-Hinds: Eaton Crouse-Hinds series DSD-SR selector switch, 30A, Single-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 SR30120 SX178
Product Length/Depth
2.38 in
Product Height
5.875 in
Product Width
3.5 in
Product Weight
1.65 lb
UPC
662276850118
Area classification
Hazardous/Classified Locations
Standards type
NEC/CEC
NEC hazardous rating
Class I, Division 1 Class II, Division 1 Class III
NEMA Rating
12 5 3
Amperage Rating
30A
Voltage rating
600 Vac
Switch function
On/Off
Number Of Poles
Single-pole
Number Of Positions
2
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 SR30120 SX178
Feature: 30A at 600 Vac with On/Off, single-pole, two-position operation. Business Impact: handles typical motor and control loads with a compact footprint, reducing panel depth and wiring effort while delivering dependable control. Application: tower cranes, pumps, and conveyors in hazardous areas benefit from robust switching with straightforward local control. Feature: Lockout for two-position switch with handle in either position. Business Impact: enhances maintenance safety by preventing unexpected restart during service windows, lowering risk and downtime. Application: lockout-tagout procedures in chemical plants and oil refineries. Feature: EDS/EFS back box compatibility. Business Impact: simplifies installation and serviceability, reducing wiring complexity and support costs. Application: rapid integration into existing hazardous-location enclosures. Feature: Hazardous-location ratings NEC/CEC Class I Division 1; Class II Division 1; Class III; NEMA 12/5/3. Business Impact: ensures regulatory compliance and equipment protection across multiple environments, mitigating ignition hazards. Application: processing plants, mining sites, and offshore facilities. Feature: 30A/600 Vac rating for rugged duty. Business Impact: supports reliable control of medium-load circuits with proven industrial robustness, lowering replacement frequency. Application: motor control and line-start loads in demanding environments.
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FAQs
Installation begins with confirming the hazardous-location rating and selecting the proper EDS/EFS back box. Mount the selector switch in the enclosure, wire per NEC/CEC guidelines for 600 Vac circuits, and use the lockout feature during maintenance. Ensure proper torque on mounting hardware and verify the On/Off operation in each position after wiring. Always follow Eaton installation sheets for best practices.
The device is rated for 30 A at 600 Vac, with On/Off switching in a single-pole, two-position configuration. It carries NEC/CEC hazardous-location certifications for Class I, Division 1, and Class II, Division 1, plus Class III. It is compatible with NEMA ratings 12, 5, and 3, and is intended for back-box installations in hazardous environments.
Yes. The selector switch is designed to be used with EDS/EFS back boxes, enabling straightforward mounting in hazardous locations. This compatibility reduces wiring complexity and accelerates installation in control panels exposed to dust, water ingress, or chemical exposure typical of hazardous-area facilities.
Industries with stringent hazardous-location requirements benefit the most, including oil and gas, chemical processing, mining, and power generation. The combination of 30 A, 600 Vac capacity, two-position control, and lockout features supports reliable operation of motors and control circuits while maintaining NEC/CEC compliance.
The integrated lockout feature enhances maintenance safety by preventing accidental re-energization. Its hazardous-location ratings and robust enclosure compatibility reduce regulatory risk and downtime, delivering a lower total cost of ownership. Long-term reliability in harsh environments translates to fewer replacements and predictable operating costs.