Equivalent & Substitute Parts for 067201.6DRT4P

Part Overview

The 067201.6DRT4P is a 1.6A 250VAC axial glass cartridge fuse manufactured by Littelfuse Inc. as part of the 672 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and component procurement. The part features fast-blow response characteristics and is designed for through-hole mounting applications requiring cartridge-style fuse protection.

Substiute Parts

067201.6DRT4P

Littelfuse Inc.In Stock: 904067201.6DRT4P Datasheet

Current PartRFQ

087401.6MRET1P

Littelfuse Inc.In Stock: 970087401.6MRET1P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 067201.6DRT4P is determined by strict equivalence across the following critical parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 50A (exact match required)
• Mounting Type: Through Hole (exact match required)
• Approval Agency: Regulatory certifications (CSA, UL, or cULus acceptable)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The substitute part 087401.6MRET1P meets all critical electrical parameters. The primary difference is the fuse element material (ceramic versus glass) and minor dimensional variations, which do not affect electrical performance or circuit protection characteristics within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

The 087401.6MRET1P is the designated manufacturer-recommended substitute for the obsolete 067201.6DRT4P. Both components are manufactured by Littelfuse Inc. and maintain electrical equivalence across all critical protection parameters: 1.6A current rating, 250V AC voltage rating, 50A breaking capacity, and fast-blow response characteristics.

The substitute part carries active product status with cULus regulatory approval, ensuring continued availability and compliance with current certification standards. The ceramic fuse element in the 087401.6MRET1P provides equivalent circuit protection performance with marginally improved thermal characteristics (melting I²t of 0.973 versus 0.965) and lower DC cold resistance (0.0525 versus 0.0565 Ohms).

Both components are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1) classification. The dimensional difference between the two parts is minor and does not affect through-hole mounting compatibility in standard cartridge fuse holders designed for non-standard axial configurations.

Frequently Asked Questions (FAQ)

Q: Can the 087401.6MRET1P directly replace the 067201.6DRT4P in existing circuits?

A: Yes. Both components share identical electrical ratings (1.6A, 250V AC), response time (fast blow), breaking capacity (50A), and mounting type (through hole). The ceramic fuse element in the substitute provides equivalent circuit protection performance.

Q: What is the primary reason for substitution?

A: The 067201.6DRT4P is classified as obsolete. The 087401.6MRET1P is the active equivalent part from the same manufacturer, ensuring continued component availability and compliance with current regulatory standards.

Q: Are there dimensional compatibility concerns?

A: The 087401.6MRET1P has slightly smaller dimensions (0.142" Dia x 0.394" L versus 0.154" Dia x 0.433" L). Both parts are designed for non-standard axial cartridge fuse holders and maintain mechanical compatibility in standard through-hole mounting applications.

Q: What regulatory certifications apply to the substitute part?

A: The 087401.6MRET1P carries cULus approval, which encompasses both CSA and UL standards. This certification is equivalent to or exceeds the original part's CSA and UL approvals.

Q: Are both parts RoHS compliant?

A: Yes. Both the 067201.6DRT4P and 087401.6MRET1P are ROHS3 compliant and carry REACH Unaffected status.

Q: What is the difference between glass and ceramic fuse elements?

A: Both glass and ceramic fuse elements provide equivalent circuit protection at the specified electrical ratings. The ceramic element in the substitute part offers marginally improved thermal stability and lower resistance characteristics while maintaining identical fast-blow response behavior.