5HFP 12-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 5HFP 12-R is a ceramic cartridge fuse manufactured by Bel Fuse Inc., rated for 12 A at 250 V AC/DC with fast-blow response characteristics. This through-hole component is designed for applications requiring reliable overcurrent protection in a compact 5mm x 20mm form factor. The part maintains active product status with full RoHS3 compliance and international approvals (CE, PSE, SEMKO). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances for this fuse category.

Substiute Parts

5HFP 12-R

Bel Fuse Inc.In Stock: 20275HFP 12-R Datasheet

Current PartRFQ

021612.5MXEP

Littelfuse Inc.In Stock: 1694021612.5MXEP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5HFP 12-R is determined by the following critical parameters:

• Current Rating: Substitute parts must operate within the same or higher current tolerance band (12 A nominal)
• Voltage Rating: Minimum 250 V AC rating required for direct substitution
• Fuse Type & Response: Fast-blow ceramic cartridge configuration mandatory
• Package Dimensions: 5mm x 20mm (Axial) form factor for mechanical compatibility
• Mounting Configuration: Through-hole mounting required
• Breaking Capacity: Minimum 1.5 kA at rated voltage
• Compliance: RoHS3 compliance and international certifications (CE, PSE) required

The substitute part 021612.5MXEP (Littelfuse Inc., Series 216) meets these criteria with a 12.5 A current rating, maintaining all other electrical and mechanical specifications within acceptable engineering tolerances for this product category.

Parameter Comparison

Engineering Selection Recommendations

Both the 5HFP 12-R and 021612.5MXEP maintain active product status with full RoHS3 compliance. The 021612.5MXEP provides expanded regulatory approvals (CSA, TUV, UR) in addition to the CE and PSE certifications shared with the primary part. The 0.5 A increase in current rating (12.5 A vs. 12 A) represents a 4.2% variance within acceptable engineering tolerance for ceramic fast-blow fuse substitution. Both parts maintain identical voltage ratings, breaking capacity, operating temperature range, and mechanical form factor. Selection between these parts depends on circuit design requirements and regulatory jurisdiction specifications.

Frequently Asked Questions (FAQ)

Q: Can the 021612.5MXEP (12.5 A) be used as a direct replacement for the 5HFP 12-R (12 A)?

A: Yes. The 0.5 A current rating difference represents a 4.2% variance. Both parts share identical voltage ratings (250 V AC), fast-blow response characteristics, breaking capacity (1.5 kA), and 5mm x 20mm package dimensions. This substitution is valid for applications where the circuit design accommodates the higher current rating.

Q: Are the physical dimensions identical between these two parts?

A: The parts share the same 5mm x 20mm (Axial) package classification. Dimensional variations exist: the 5HFP 12-R measures 0.217" Dia x 0.827" L (5.50mm x 21.00mm), while the 021612.5MXEP measures 0.228" Dia x 0.886" L (5.80mm x 22.50mm). Both dimensions remain within standard through-hole fuse mounting tolerances.

Q: What is the difference in melting I²t between these parts?

A: The 5HFP 12-R has a melting I²t of 408, while the 021612.5MXEP has a melting I²t of 235. This difference reflects the distinct thermal characteristics of each manufacturer's ceramic formulation and affects the precise trip time under fault conditions.

Q: Which certifications apply to each part?

A: The 5HFP 12-R carries CE, PSE, and SEMKO approvals. The 021612.5MXEP carries CE, CSA, PSE, TUV, and UR approvals. Both parts meet international safety standards; the 021612.5MXEP provides additional regulatory coverage for North American (CSA, UR) and European (TUV) markets.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 5HFP 12-R and 021612.5MXEP are RoHS3 compliant with REACH Unaffected status.