Hammond Manufacturing 291FEX Power Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 291FEX is a laminated core power transformer designed for chassis mount applications with dual secondary windings and center tap configuration. This component features a 240V primary input with dual secondary outputs of 640V at 518mA and 6.5V at 5.5A. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and component procurement.

Substiute Parts

291FEX

Hammond ManufacturingIn Stock: 877291FEX Datasheet

Current PartRFQ

290FEX

Hammond ManufacturingIn Stock: 705290FEX Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Hammond Manufacturing 290FEX qualifies as a direct substitute for the 291FEX based on electrical and mechanical parameter equivalence. Substitution is valid when the following criteria are met:

Critical Matching Parameters:

• Voltage - Primary: 240V (identical)
• Voltage - Secondary (Full Load): 640V, 6.5V (identical)
• Current - Output (Max): 518mA, 5.5A (identical)
• Primary Winding Configuration: Single (identical)
• Secondary Winding Configuration: Dual (identical)
• Center Tap: Yes (identical)
• Mounting Type: Chassis Mount (identical)
• Termination Style: Wire Leads (identical)
• Physical Dimensions: 95.25mm L x 119.13mm W, 115.90mm Height (identical)
• Weight: 12 lbs (5.4 kg) (identical)
• Core Type: Laminated (identical)
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected (identical)

The 290FEX maintains full electrical and mechanical compatibility with the 291FEX, differing only in series designation and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The Hammond Manufacturing 290FEX is the appropriate substitute for the obsolete 291FEX. Both components are manufactured by Hammond Manufacturing and maintain identical electrical specifications, physical dimensions, and regulatory compliance certifications. The 290FEX carries active product status, ensuring ongoing availability and supply chain continuity. Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The transition from 291FEX to 290FEX requires no circuit modifications, mechanical redesign, or compliance re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can the 290FEX directly replace the 291FEX without circuit modifications?

A: Yes. The 290FEX provides identical electrical output specifications (240V primary, 640V and 6.5V secondary outputs), identical current ratings (518mA and 5.5A), and identical winding configurations (single primary, dual secondary with center tap). No circuit changes are required.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the 291FEX and 290FEX share identical dimensions of 95.25mm length, 119.13mm width, and 115.90mm maximum seated height. Both weigh 12 lbs (5.4 kg) and use chassis mount configuration with wire lead termination.

Q: What is the difference between the 291FEX and 290FEX?

A: The primary difference is product status. The 291FEX is classified as obsolete, while the 290FEX is active. The series designation differs (291 versus 290), but all electrical, mechanical, and compliance parameters are identical.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the 291FEX and 290FEX are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: What packaging is available for the 290FEX?

A: The 290FEX is supplied in box packaging. The 291FEX packaging specification was not provided in the available data.