Littelfuse 031306.3VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031306.3VXP is a 6.3 A, 250 V AC slow-blow glass cartridge fuse in the 313 series, designed for applications requiring circuit protection in 3AB and 3AG holder configurations. This active product is ROHS3 compliant and holds multiple international approvals including CE, CSA, KC, PSE, and UL certification. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and holder compatibility to ensure direct functional replacement in protected circuit applications.

Substiute Parts

031306.3VXP

Littelfuse Inc.In Stock: 929031306.3VXP Datasheet

Current PartRFQ

031306.3HXP

Littelfuse Inc.In Stock: 1241031306.3HXP Datasheet

Parametric EquivalentRFQ

031306.3MXP

LittelfuseIn Stock: 1481031306.3MXP Datasheet

Parametric EquivalentRFQ

0001.2532

SCHURTER Inc.In Stock: 19120001.2532 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 031306.3VXP are classified into two categories based on parametric equivalence and manufacturer recommendation:

Parametric Equivalents (Littelfuse 031306.3HXP and 031306.3MXP): These parts maintain identical electrical specifications including 6.3 A current rating, 250 V AC voltage rating, slow-blow response time, and 3AB/3AG holder compatibility. Physical dimensions, melting I²t values, and DC cold resistance are identical. The primary distinction is packaging variant designation (HXP vs. MXP vs. VXP), which reflects different manufacturing or distribution batches within the same product line. All three parts carry ROHS3 compliance and equivalent approval certifications (CE, CSA, PSE, UL), with 031306.3HXP and 031306.3MXP including K-MARK certification.

Manufacturer Recommended Equivalent (SCHURTER 0001.2532): This part is functionally equivalent for AC applications at the specified 6.3 A and 250 V AC rating with identical slow-blow response and 3AB/3AG holder compatibility. The SCHURTER part adds DC voltage capability (63 V DC) and higher breaking capacity (1.5 kA AC, 20 kA DC) compared to the Littelfuse 200 A AC rating. Operating temperature range differs (-40°C ~ 85°C vs. -55°C ~ 125°C), and melting I²t is slightly lower (224 vs. 242). Approval certification is cURus (combined UL and CSA). This part is suitable for applications where DC voltage protection or enhanced breaking capacity is required.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (031306.3HXP or 031306.3MXP): Select either Littelfuse parametric equivalent when the original 031306.3VXP is unavailable. Both parts are electrically and mechanically identical with matching approval certifications. Choice between HXP and MXP variants depends on packaging availability and inventory status. Both maintain the full operating temperature range (-55°C ~ 125°C) and identical breaking capacity specifications.

For Enhanced DC Protection (0001.2532 SCHURTER): Select this part when the application requires DC voltage protection capability (up to 63 V DC) or when higher breaking capacity (20 kA DC) is specified in circuit design requirements. The SCHURTER part is suitable for mixed AC/DC circuits. Note that the operating temperature range is reduced to -40°C ~ 85°C, which may limit use in extreme temperature environments. The melting I²t value (224) is slightly lower than the Littelfuse parts (242), requiring verification that this characteristic aligns with circuit protection requirements.

All substitute parts maintain ROHS3 compliance and hold recognized international safety certifications (CE, CSA, UL or cURus). Physical compatibility with 3AB and 3AG holders is confirmed across all options.

Frequently Asked Questions (FAQ)

Q: Can 031306.3HXP and 031306.3MXP be used interchangeably with 031306.3VXP?

A: Yes. These three Littelfuse parts are parametric equivalents with identical current rating (6.3 A), voltage rating (250 V AC), response time (slow blow), physical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG). The VXP, HXP, and MXP designations represent packaging variants within the same product line. All three carry ROHS3 compliance and equivalent safety certifications.

Q: When should I use the SCHURTER 0001.2532 instead of the Littelfuse equivalents?

A: Use the SCHURTER part when your circuit design includes DC voltage protection requirements (up to 63 V DC) or when higher breaking capacity (20 kA DC) is specified. The SCHURTER part is suitable for mixed AC/DC applications. For pure AC circuits at 250 V, the Littelfuse parts are preferred due to their extended operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C).

Q: Are all substitute parts compatible with 3AB and 3AG fuse holders?

A: Yes. All listed substitute parts are designed for 3AB and 3AG holder configurations with matching physical dimensions (0.250" diameter x 1.250" length). Physical installation compatibility is confirmed across all options.

Q: What is the difference between melting I²t values of 242 and 224?

A: Melting I²t is a thermal characteristic that determines the energy required to melt the fuse element. The Littelfuse parts (242) require slightly more thermal energy to operate than the SCHURTER part (224). This difference may affect response time in circuits with specific inrush current profiles. Verify that the SCHURTER part's lower I²t value aligns with your circuit protection requirements before substitution.

Q: Do all substitute parts have the same approval certifications?

A: The Littelfuse parts (031306.3VXP, 031306.3HXP, 031306.3MXP) carry CE, CSA, PSE, and UL certifications, with HXP and MXP also including K-MARK. The SCHURTER 0001.2532 carries cURus certification (combined UL and CSA). All parts are ROHS3 compliant. Verify that the certification set meets your application's regulatory requirements.

Q: Can the SCHURTER 0001.2532 be used in applications requiring the full -55°C ~ 125°C operating temperature range?

A: No. The SCHURTER part is rated for -40°C ~ 85°C, which is narrower than the Littelfuse range of -55°C ~ 125°C. For applications requiring operation at temperatures below -40°C or above 85°C, use the Littelfuse parametric equivalents (031306.3HXP or 031306.3MXP).