Littelfuse 0495050.Z Automotive Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0495050.Z is a 50A automotive fuse rated for 32V DC operation, designed for use in automotive electrical systems requiring holder-mounted protection. This component features a medium blow response characteristic and is housed in the Auto Link package format. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives for ongoing system support and new designs.

Substiute Parts

0495050.Z

Littelfuse Inc.In Stock: 8080495050.Z Datasheet

Current PartRFQ

0495050.ZXA

Littelfuse Inc.In Stock: 28870495050.ZXA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0495050.ZXA serves as a direct substitute for the 0495050.Z based on the following critical parameters:

• Current Rating: Both parts are rated for 50 A
• Voltage Rating: Both parts support 32 V operation
• Package / Case: Both use Auto Link format
• Fuse Type: Both are automotive-grade fuses
• Mounting Type: Both require holder mounting
• Physical Dimensions: Identical form factor (14.10mm x 12.00mm x 27.00mm)
• Operating Temperature Range: Identical (-40°C to 125°C)
• Breaking Capacity: Both rated at 1 kA @ rated voltage
• Melting I²t: Both rated at 8750
• RoHS Compliance: Both ROHS3 compliant

The primary difference between these parts is the response time characteristic: the 0495050.Z features medium blow response, while the 0495050.ZXA features slow blow response. Additionally, the 0495050.ZXA is rated for both AC and DC operation at 32 V, whereas the 0495050.Z is specified for DC operation. The 0495050.ZXA is currently in active production status.

Parameter Comparison

Engineering Selection Recommendations

The 0495050.ZXA is the designated substitute for the obsolete 0495050.Z. Both parts maintain identical current and voltage ratings, physical dimensions, and breaking capacity specifications. The substitute part is currently in active production status with full ROHS3 compliance and UR approval agency certification.

Selection of the 0495050.ZXA is appropriate for applications requiring 50A protection at 32V in automotive systems. The slow blow response characteristic of the substitute part provides extended protection against transient overcurrent conditions compared to the medium blow response of the original part. This characteristic difference should be evaluated against specific circuit protection requirements.

Both parts are rated for the same operating temperature range (-40°C to 125°C) and maintain equivalent breaking capacity at rated voltage. The substitute part's dual AC/DC voltage rating provides broader application flexibility compared to the DC-only specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can the 0495050.ZXA directly replace the 0495050.Z in existing designs?

A: Yes. Both parts share identical current ratings (50A), voltage ratings (32V), physical dimensions (14.10mm x 12.00mm x 27.00mm), Auto Link package format, and breaking capacity (1kA). The parts are mechanically and electrically compatible for holder-mounted automotive fuse applications.

Q: What is the difference between medium blow and slow blow response?

A: Response time classification indicates the fuse element's thermal response to overcurrent conditions. Medium blow fuses (0495050.Z) respond faster to sustained overcurrent, while slow blow fuses (0495050.ZXA) tolerate brief transient overcurrent spikes before opening. Selection depends on circuit characteristics and tolerance for temporary overcurrent events.

Q: Why does the 0495050.ZXA have a higher DC cold resistance value?

A: The DC cold resistance values (0.00099 Ohms vs. 0.99 Ohms) reflect differences in fuse element design between the medium blow and slow blow variants. This parameter is provided for reference and does not affect the substitution compatibility for standard automotive protection applications.

Q: Is the 0495050.ZXA suitable for both AC and DC applications?

A: The 0495050.ZXA is rated for both 32V AC and 32V DC operation. The original 0495050.Z is specified for DC operation only. For applications requiring AC operation, the 0495050.ZXA provides expanded capability.

Q: What certifications apply to the substitute part?

A: The 0495050.ZXA carries ROHS3 compliance and UR approval agency certification. Both parts are classified as ECCN EAR99 and share the same HTSUS code (8536.10.0040).