Equivalent & Substitute Parts for S500-40-R Glass Fuse Cartridge

Part Overview

The S500-40-R is a 40 mA, 250 V AC/DC fast-blow glass fuse cartridge manufactured by Eaton - Electronics Division. This component is designed for use in 5mm x 20mm fuse holders and provides circuit protection in electronic equipment. The part maintains Active product status with 756 units in current inventory. Alternative equivalent parts are available to support supply chain flexibility and procurement options while maintaining identical electrical and mechanical performance characteristics.

Substiute Parts

S500-40-R

Eaton - Electronics DivisionIn Stock: 820S500-40-R Datasheet

Current PartRFQ

BK/S500-40-R

Eaton - Electronics DivisionIn Stock: 811BK/S500-40-R Datasheet

Parametric EquivalentRFQ

0034.1528

SCHURTER Inc.In Stock: 37080034.1528 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S500-40-R are classified based on strict parametric equivalence. The following electrical and mechanical parameters determine substitution eligibility:

Critical Parameters (Must Match Exactly):

• Current Rating: 40 mA
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 5mm x 20mm
• Breaking Capacity @ Rated Voltage: 35A

Acceptable Variation Parameters:

• Melting I²t: Minor variations within 0.00011 to 0.000128 range
• DC Cold Resistance: 25 Ohms nominal
• Operating Temperature: Extended range acceptable if specified

All substitute parts listed maintain identical form factor, electrical ratings, and functional characteristics required for direct replacement in existing fuse holder assemblies.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (S500-40-R): The original Eaton S500-40-R maintains Active product status with established supply availability (756 units in stock). This part is ROHS3 compliant and suitable for standard applications requiring 40 mA protection at 250 V AC/DC.

Secondary Selection (BK/S500-40-R): The BK/S500-40-R variant from Eaton - Electronics Division is parametrically identical to the primary part and maintains the same electrical specifications, response characteristics, and physical dimensions. This part carries Active product status with higher inventory availability (796 units in stock). Selection between S500-40-R and BK/S500-40-R depends on procurement channel and supply chain requirements.

Tertiary Selection (0034.1528): The SCHURTER Inc. FSF 5x20 series part 0034.1528 provides full parametric equivalence with identical current rating, voltage rating, fuse type, response time, and package dimensions. This part carries additional approval certifications (CCC, cURus, VDE) and specified operating temperature range (-55°C ~ 125°C). The melting I²t value (0.000128) represents a minor variation within acceptable tolerance. Inventory availability is highest at 3622 units in stock. This part is suitable for applications requiring extended temperature operation or additional regulatory certifications.

All three parts are ROHS3 compliant and maintain Active product status, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can BK/S500-40-R be used as a direct replacement for S500-40-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical ratings (40 mA, 250 V AC/DC), fuse type (Cartridge, Glass), response time (Fast Blow), and physical dimensions (5mm x 20mm). The parts are functionally interchangeable in all applications requiring these specifications.

Q: What is the difference between the Eaton S500-40-R and the SCHURTER 0034.1528?

A: Both parts meet identical electrical and mechanical requirements for 40 mA, 250 V AC/DC fast-blow glass fuse cartridges in 5mm x 20mm form factor. The SCHURTER part includes additional regulatory approvals (CCC, cURus, VDE) and specifies an operating temperature range of -55°C ~ 125°C. The melting I²t value differs slightly (0.000128 versus 0.00011), which remains within acceptable tolerance for this component category.

Q: Are all substitute parts compatible with existing 5mm x 20mm fuse holders?

A: Yes. All listed substitute parts maintain identical physical dimensions (0.205" Dia x 0.787" L / 5.20mm x 20.00mm) and require holder mounting. Direct mechanical compatibility is confirmed across all three parts.

Q: Which part should be selected for applications requiring extended temperature operation?

A: The SCHURTER 0034.1528 specifies an operating temperature range of -55°C ~ 125°C. This part is suitable for applications requiring operation beyond standard temperature ranges. The Eaton parts do not specify operating temperature limits in the provided data.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three parts (S500-40-R, BK/S500-40-R, and 0034.1528) maintain ROHS3 compliance status.

Q: What is the significance of the melting I²t parameter?

A: The melting I²t value characterizes the thermal energy required to melt the fuse element. The S500-40-R and BK/S500-40-R specify 0.00011, while the SCHURTER 0034.1528 specifies 0.000128. Both values are within acceptable tolerance for this 40 mA fast-blow cartridge fuse category and do not affect functional equivalence.

Q: Can these parts be used in both AC and DC circuits?

A: Yes. All three parts are rated for 250 V AC/DC operation, confirming suitability for both alternating and direct current applications at the specified voltage.