Eaton Crouse-Hinds EMP0491 Selector Switch - Key removal
Part Number: EMP0491
Quick Summary
The EMP0491 selector switch operator from Eaton Crouse-Hinds enables safe local control in hazardous-area equipment. Facilities often struggle with tampering and accidental energization in classified zones, and this unit’s key-operated actuation with position retention helps mitigate those risks while supporting quick, reliable fault isolation. It is certified for NEC/CEC compliance across multiple hazardous area ratings, including Class I Division 1 and 2, Class II Division 1 and 2, and Class III, with NEMA protection ratings 3, 7, and 9. By pairing compact form with standard mounting and a straightforward wiring footprint, it delivers dependable control without sacrificing cabinet density or expandability. This makes it a practical choice for oil & gas, chemical, marine, and other demanding environments seeking robust, compliant local control solutions.
Product Information
Extended Description
EMP0491 Eaton Crouse-Hinds: Eaton Crouse-Hinds series EMP selector switch operator, Standard, Two-position selector switch, key operated, Key removal both positions, One contact block
Product Name
Eaton Crouse-Hinds series EMP selector switch operator
Catalog Number
EMP0491
Product Length/Depth
6.63 in
Product Height
2.63 in
Product Width
2.63 in
Product Weight
0.55 lb
UPC
782274028750
Area classification
Hazardous/Classified Locations
Standards type
NEC/CEC
NEC hazardous rating
Class I, Division 1 Class I, Division 2 Class II, Division 1 Class II, Division 2 Class III
NEMA Rating
3 7 9
Operator style
Two-position selector switch, key operated
Assembly style
Standard
Special features
One contact block
Type
Key removal both positions
EMP and EMPS Hazardous Area Operators catalog page
IF 1702 - EMP/EMPS Barrel Assemblies - ATEX and IEC version
IF 1702 - EMP/EMPS Barrel Assemblies - ATEX and IEC version
Eaton Specification Sheet - EMP0491
Feature → Business Impact → Application: The EMP0491 offers a two-position selector switch that is key operated, delivering tamper-resistance and secure control in hazardous locations. This translates to reduced risk of unauthorized restarts and safer maintenance windows, especially in refinery and offshore panels where personnel access must be tightly controlled. The standard assembly style simplifies retrofit projects and minimizes engineering time when replacing older devices, accelerating commissioning in new-build or expansion projects. Feature → Business Impact → Application: One contact block reduces wiring complexity and panel footprint, lowering installation time and potential wiring errors while improving reliability in pump stations, conveyors, and process skids. Feature → Business Impact → Application: NEC/CEC compliance and Class I/II/III ratings provide regulators and operators with confidence in safety and performance, avoiding non-conformance penalties and enabling safer operation in chemical plants, oil platforms, and hazardous-area equipment enclosures. Feature → Business Impact → Application: NEMA 3, 7, 9 protection supports outdoor and marine environments, ensuring dependable operation despite dust, water, oil, or splash exposure. Feature → Business Impact → Application: Compact dimensions—6.63 in length, 2.63 in height and width, 0.55 lb weight—enable easy integration into crowded control panels and retrofits without major enclosure upgrades. Feature → Business Impact → Application: The combination of a standard catalog number, UPC 782274028750, and easy availability reduces procurement lead times and simplifies parts management for maintenance teams across multiple sites.
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FAQs
EMP0491 is designed for standard, standard-assembly installations and is compatible with typical barrel assemblies used in hazardous locations. Its standard dimensions (6.63 in length, 2.63 in width, 2.63 in height) and a single contact block simplify retrofits, reducing rework and enabling straightforward wiring consolidation within existing panels.
EMP0491 carries NEC/CEC standards with hazardous ratings across Class I, Division 1 and Division 2, Class II, Division 1 and 2, and Class III. It also carries NEMA ratings 3, 7, and 9, making it suitable for a wide range of hazardous-area and outdoor/marine applications while meeting regulatory requirements.
Yes. EMP0491 is specified for Class I, Division 1 and Division 2 environments, offering key-operated, two-position switching with reliable isolation and tamper resistance. Its construction and certification align with high-safety standards for flammable atmosphere zones typically found in oil and gas processing, chemical plants, and offshore facilities.
Begin by confirming panel cutouts and mounting dimensions align with the 6.63 in depth and 2.63 in width/height. Mount the EMP0491 in a standard barrel assembly, wire the contact block according to the control circuit diagram, and secure the unit with proper IP/NEMA seals. The key-removal feature ensures safe operation during maintenance and prevents unauthorized re-energization.
Expected benefits include reduced tampering risk, fewer unintended startups, and lower panel maintenance frequency due to robust, certified construction. By simplifying wiring with a single contact block and enabling faster commissioning, the device can shorten downtime during changeovers and upgrades, delivering measurable lifecycle cost savings in process, marine, and refinary environments.