S506-63-R Glass Cartridge Fuse 63mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The S506-63-R is a slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division, rated for 63 mA at 250 V AC/DC. This component is designed for circuits requiring overcurrent protection with delayed response characteristics. The fuse operates in a 5mm x 20mm form factor and requires a dedicated holder for installation. Product status is Active with 922 pieces in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across compatible applications.

Substiute Parts

S506-63-R

Eaton - Electronics DivisionIn Stock: 1011S506-63-R Datasheet

Current PartRFQ

BK1/S506-63-R

Eaton - Electronics DivisionIn Stock: 1668BK1/S506-63-R Datasheet

Parametric EquivalentRFQ

GDC-63MA

Eaton - Electronics DivisionIn Stock: 1179GDC-63MA Datasheet

Parametric EquivalentRFQ

0218.063MXP

Littelfuse Inc.In Stock: 19930218.063MXP Datasheet

DirectRFQ

BK/S506-63-R

Eaton - Electronics DivisionIn Stock: 839BK/S506-63-R Datasheet

DirectRFQ

0218.063HXP

Littelfuse Inc.In Stock: 10580218.063HXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S506-63-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 63 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)

Acceptable Variation Parameters:

• Manufacturer: Different manufacturers permitted
• Series designation: Different series permitted
• DC Cold Resistance: Variation permitted within functional tolerance
• Melting I²t: Variation permitted (0.021 to 0.0117 range observed)
• Approval Agencies: Subset or superset of certifications acceptable
• Operating Temperature range: Variation permitted if not specified as constraint

All substitute parts listed meet or exceed the mandatory matching criteria. Differences in DC Cold Resistance and Melting I²t values reflect manufacturing process variations between Eaton and Littelfuse product lines while maintaining functional equivalence for the specified 63 mA, 250 V application.

Parameter Comparison

Engineering Selection Recommendations

Eaton S506 Series (S506-63-R, BK1/S506-63-R, BK/S506-63-R): These parts share identical electrical and mechanical specifications with the main part number. All three variants carry Active product status and hold equivalent approval certifications (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE). Selection among these three is based on inventory availability and procurement lead time. BK1/S506-63-R offers the highest current inventory at 1658 pieces.

Eaton GDC Series (GDC-63MA): This part maintains identical electrical parameters and DC Cold Resistance to the S506 series. Approval certifications are limited to cURus and IMQ. GDC-63MA is suitable for applications where these certifications satisfy regulatory requirements. Inventory availability is 1145 pieces.

Littelfuse 218 Series (0218.063MXP, 0218.063HXP): These parts meet all mandatory electrical and mechanical parameters. DC Cold Resistance is elevated at 17.65 Ohms compared to Eaton products at 6.96 Ohms. Melting I²t is reduced to 0.0117 versus 0.021 for Eaton products. Littelfuse parts carry broader approval certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and specified operating temperature range of -55°C to 125°C. These characteristics make Littelfuse parts suitable for applications requiring extended temperature operation or broader international compliance. Inventory availability is 1899 pieces for 0218.063MXP and 1045 pieces for 0218.063HXP.

Frequently Asked Questions (FAQ)

Q: Can I substitute BK1/S506-63-R for S506-63-R in my circuit?

A: Yes. BK1/S506-63-R is a parametric equivalent with identical current rating (63 mA), voltage rating (250 V AC), package (5mm x 20mm), response time (Slow Blow), and breaking capacity (35A). Both parts require the same holder and carry the same approval certifications.

Q: What is the difference between Eaton and Littelfuse fuses in this rating?

A: Both manufacturers produce 63 mA, 250 V, 5x20mm slow-blow glass cartridge fuses meeting the same breaking capacity. Littelfuse parts (0218.063MXP, 0218.063HXP) have higher DC Cold Resistance (17.65 Ohms vs. 6.96 Ohms) and lower Melting I²t (0.0117 vs. 0.021). Littelfuse parts include specified operating temperature range (-55°C to 125°C) and broader international certifications.

Q: Are GDC-63MA and S506-63-R interchangeable?

A: Yes, for applications where cURus and IMQ certifications are acceptable. Both parts have identical electrical specifications, DC Cold Resistance, and Melting I²t. The primary difference is the reduced approval agency list for GDC-63MA.

Q: Which substitute part should I choose for maximum inventory availability?

A: 0218.063MXP (Littelfuse) offers the highest inventory at 1899 pieces, followed by BK1/S506-63-R (Eaton) at 1658 pieces.

Q: Do all these fuses require the same holder?

A: Yes. All listed parts are 5mm x 20mm cartridge fuses requiring a compatible 5x20mm fuse holder. Mechanical compatibility is guaranteed across all substitute parts.

Q: What does "Slow Blow" response time mean?

A: Slow Blow fuses tolerate temporary current surges without opening. They are designed to open only during sustained overcurrent conditions, making them suitable for circuits with inrush current characteristics.

Q: Can I use a Littelfuse fuse in place of an Eaton fuse if my application requires -55°C operation?

A: Yes. Littelfuse 218 series parts specify operating temperature range of -55°C to 125°C, while Eaton S506 and GDC series do not specify an operating temperature range. For applications requiring confirmed low-temperature operation, Littelfuse parts provide documented temperature specifications.