Equivalent & Substitute Parts for S500-50-R Glass Fuse Cartridge

Part Overview

The Eaton S500-50-R is a 50 mA, 250 V AC/DC fast-blow glass fuse cartridge in 5mm x 20mm form factor. This component is designed for circuit protection in electronic equipment requiring reliable overcurrent interruption. The part maintains active product status with 635 units in current inventory. Equivalent substitute parts are necessary to ensure supply chain continuity, accommodate regional availability differences, and support design flexibility across manufacturing locations.

Substiute Parts

S500-50-R

Eaton - Electronics DivisionIn Stock: 695S500-50-R Datasheet

Current PartRFQ

BK/S500-50-R

Eaton - Electronics DivisionIn Stock: 710BK/S500-50-R Datasheet

Parametric EquivalentRFQ

0217.050MXP

Littelfuse Inc.In Stock: 23570217.050MXP Datasheet

DirectRFQ

0034.1529

SCHURTER Inc.In Stock: 7670034.1529 Datasheet

Parametric EquivalentRFQ

0217.050HXP

LittelfuseIn Stock: 31790217.050HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S500-50-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 50 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)
• Mounting Type: Requires Holder (exact match required)

All four substitute parts meet these mandatory parameters without deviation. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agencies do not disqualify substitution but are documented for engineering reference.

Parameter Comparison

Engineering Selection Recommendations

All four substitute parts are functionally equivalent to the S500-50-R based on mandatory electrical and mechanical parameters. Selection among these alternatives should be based on the following factors:

Compliance & Certifications: The Littelfuse parts (0217.050MXP and 0217.050HXP) carry the broadest approval agency coverage, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. The SCHURTER part (0034.1529) holds CCC, cURus, and VDE approvals. The Eaton BK/S500-50-R variant maintains the same manufacturer as the primary part with RoHS compliance.

Supply Availability: Littelfuse 0217.050HXP offers the highest inventory level at 3075 units. Littelfuse 0217.050MXP provides 2300 units. Both SCHURTER and Eaton BK variants maintain inventory above 680 units.

Operating Temperature Range: Littelfuse parts (0217.050MXP and 0217.050HXP) and SCHURTER part (0034.1529) specify operating temperature range of -55°C to 125°C. The primary S500-50-R and BK/S500-50-R variant do not specify operating temperature limits in provided data.

Electrical Characteristics: DC cold resistance values are provided for Littelfuse parts (15.2 Ohms) and the primary S500-50-R (17 Ohms). Melting I²t values range from 0.00019 to 0.00025, with all values within acceptable tolerance for this fuse category.

Frequently Asked Questions (FAQ)

Q: Can the BK/S500-50-R be used as a direct replacement for S500-50-R?

A: Yes. The BK/S500-50-R is a parametric equivalent manufactured by the same company (Eaton - Electronics Division) with identical electrical and mechanical specifications. Both parts share the same series designation (S500) and require the same holder type.

Q: What is the difference between Littelfuse 0217.050MXP and 0217.050HXP?

A: Both parts are functionally equivalent with identical current rating, voltage rating, fuse type, response time, and package dimensions. The primary difference is inventory availability, with 0217.050HXP maintaining higher stock levels (3075 units versus 2300 units). Both carry identical approval certifications and operating temperature specifications.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts meet RoHS requirements. The primary S500-50-R, Littelfuse parts (0217.050MXP and 0217.050HXP), and SCHURTER part (0034.1529) are ROHS3 compliant. The Eaton BK/S500-50-R variant is RoHS compliant.

Q: Does the 5mm x 20mm package dimension apply to all substitute parts?

A: Yes. All substitute parts use the identical 5mm x 20mm form factor (0.205" Dia x 0.787" L). All require a compatible fuse holder designed for this package size.

Q: Which substitute part has the broadest international approval coverage?

A: The Littelfuse parts (0217.050MXP and 0217.050HXP) carry the most comprehensive approval agency certifications, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. These certifications support deployment across North American, European, and Asian markets.

Q: Can I mix different substitute parts in the same equipment design?

A: All substitute parts meet identical mandatory electrical and mechanical parameters. However, design documentation should specify a single part number or explicitly list approved alternatives to maintain consistency in manufacturing, testing, and field service operations.