S505-800-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The Eaton S505-800-R is an 800 mA ceramic fuse cartridge rated for 250 V AC with slow-blow response characteristics. This component operates in the 5mm x 20mm form factor and requires a compatible fuse holder for installation. The part maintains active product status with full regulatory compliance across multiple international approval agencies including BSI, CCC/CQC, CSA, cULus, IMQ, SEMKO, and VDE. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 800 mA ceramic fuse cartridges in the 5x20mm package.

Substiute Parts

S505-800-R

Eaton - Electronics DivisionIn Stock: 1063S505-800-R Datasheet

Current PartRFQ

BK/S505-800-R

Eaton - Electronics DivisionIn Stock: 847BK/S505-800-R Datasheet

DirectRFQ

0215.800MXP

Littelfuse Inc.In Stock: 34050215.800MXP Datasheet

DirectRFQ

0001.2503

SCHURTER Inc.In Stock: 21310001.2503 Datasheet

Parametric EquivalentRFQ

0215.800HXP

Littelfuse Inc.In Stock: 13090215.800HXP Datasheet

Parametric EquivalentRFQ

0215.800TXP

Littelfuse Inc.In Stock: 8940215.800TXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S505-800-R is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 800 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)
• Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

• Voltage Rating (DC): May vary; higher DC ratings provide expanded application scope
• Operating Temperature Range: May vary; wider ranges support broader environmental conditions
• Melting I²t: May vary; affects thermal response characteristics
• DC Cold Resistance: May vary; affects circuit behavior during normal operation
• Regulatory Approvals: Must maintain active product status and appropriate certifications

All substitute parts listed maintain identical electrical and mechanical specifications for the primary criteria, ensuring direct functional equivalence in applications designed for the S505-800-R.

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Equivalent: BK/S505-800-R from Eaton - Electronics Division is the direct equivalent designation for the S505-800-R. Both parts share identical electrical and mechanical specifications, regulatory approvals, and manufacturing source. Selection between these designations depends on internal part numbering conventions and procurement systems.

Cross-Manufacturer Substitutes (Littelfuse Series 215): The 0215.800MXP, 0215.800HXP, and 0215.800TXP from Littelfuse Inc. are parametric equivalents meeting all primary substitution criteria. These parts maintain 800 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, 1.5 kA breaking capacity, and slow-blow response. Littelfuse parts provide expanded operating temperature range (-55°C to 125°C) and ROHS3 compliance. DC cold resistance differs at 0.4675 Ohms compared to 0.237 Ohms in the Eaton part, and melting I²t is higher at 0.975 compared to 0.632. These differences do not affect functional equivalence for applications designed to the S505-800-R specification.

Parametric Equivalent with Enhanced DC Rating: The 0001.2503 from SCHURTER Inc. (SPT 5x20 series) meets all primary substitution criteria and additionally provides 300 V DC voltage rating, extending application scope beyond AC-only designs. This part features the highest melting I²t value at 2.3, indicating slower thermal response. SCHURTER certification includes cURus and VDE approvals. Selection of this part is appropriate for applications requiring dual AC/DC voltage capability.

All substitute parts maintain active product status and appropriate regulatory certifications for their respective manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the BK/S505-800-R be used as a direct replacement for S505-800-R?

A: Yes. BK/S505-800-R is the direct manufacturer equivalent from Eaton - Electronics Division. Both parts share identical specifications across all electrical and mechanical parameters, regulatory approvals, and manufacturing source. Selection depends on internal part numbering systems and procurement documentation.

Q: What is the difference between Eaton S505-800-R and Littelfuse 0215.800MXP?

A: Both parts are functionally equivalent with identical current rating (800 mA), voltage rating (250 V AC), package (5mm x 20mm), breaking capacity (1.5 kA), and response time (slow blow). Differences include: Littelfuse provides specified operating temperature range (-55°C to 125°C) while Eaton does not specify this range; DC cold resistance is 0.4675 Ohms (Littelfuse) versus 0.237 Ohms (Eaton); melting I²t is 0.975 (Littelfuse) versus 0.632 (Eaton). These differences do not affect functional equivalence for applications designed to the S505-800-R specification.

Q: When should I select SCHURTER 0001.2503 instead of other substitutes?

A: Select the SCHURTER 0001.2503 when your application requires dual AC/DC voltage capability. This part is rated for 250 V AC and 300 V DC, compared to 250 V AC only for other listed substitutes. The higher melting I²t value (2.3) indicates slower thermal response. All other electrical and mechanical parameters remain equivalent to the S505-800-R.

Q: Are all substitute parts compatible with the same fuse holder as S505-800-R?

A: Yes. All substitute parts maintain the 5mm x 20mm package specification and require a compatible fuse holder identical to the S505-800-R. No holder modifications or adaptations are necessary.

Q: What regulatory approvals apply to each substitute part?

A: S505-800-R and BK/S505-800-R carry approvals from BSI, CCC/CQC, CSA, cULus, IMQ, SEMKO, and VDE. Littelfuse parts (0215.800MXP, 0215.800HXP, 0215.800TXP) carry approvals from CE, CSA, SEMKO, UL, and VDE. SCHURTER 0001.2503 carries approvals from cURus and VDE. All parts maintain active product status and appropriate RoHS compliance for their respective manufacturers.

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

A: All listed substitute parts meet identical primary electrical and mechanical specifications for the S505-800-R application. Mixing different manufacturers or part numbers in the same equipment is permissible from a functional equivalence standpoint. However, follow your equipment manufacturer's specifications and internal procurement standards for consistency and traceability.

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

A: Slow Blow indicates the fuse has a delayed response to overcurrent conditions. The fuse tolerates temporary current surges without opening, protecting against nuisance trips from inrush currents or transient events. The fuse opens only when sustained overcurrent exceeds the rated 800 mA threshold. This characteristic is identical across all listed substitute parts.

Q: How do I verify that a substitute part is appropriate for my application?

A: Confirm that your application requires: 800 mA current rating, 250 V AC voltage rating (or 250 V AC and 300 V DC for SCHURTER part), 5mm x 20mm package, slow-blow response, and 1.5 kA breaking capacity. All listed substitute parts meet these criteria. Verify that your fuse holder is compatible with the 5mm x 20mm cartridge format. Consult your equipment manufacturer's documentation for any additional requirements.