Littelfuse 20102000021 Glass Cartridge Fuse 200mA 250VAC 5x20mm - Equivalent & Substitute Parts

Part Overview

The Littelfuse 20102000021 is a 200 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection applications requiring medium blow response characteristics. This component is classified as Active product status and is cULus approved. Substitute parts may be required due to inventory constraints, supply chain considerations, or specific application requirements where alternative manufacturers or series variants meet identical electrical and mechanical specifications.

Substiute Parts

20102000021

Littelfuse Inc.In Stock: 78820102000021 Datasheet

Current PartRFQ

20102000021P

Littelfuse Inc.In Stock: 108920102000021P Datasheet

Parametric EquivalentRFQ

BK1/GMC-200-R

Eaton - Electronics DivisionIn Stock: 1870BK1/GMC-200-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 20102000021 are grouped based on strict electrical and mechanical parameter alignment. The primary substitution criteria are: current rating (200 mA), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (medium blow), and mounting configuration (requires holder). Parts meeting all these parameters are classified as direct equivalents regardless of manufacturer or series designation.

The substitute parts identified are:

• Littelfuse 20102000021P: Parametric equivalent within the same manufacturer, Series 201P variant
• Eaton BK1/GMC-200-R: Cross-manufacturer equivalent, Series GMC

All listed substitutes maintain identical current, voltage, package, and response characteristics as the main part.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain Active product status and comply with RoHS3 and REACH requirements. The Littelfuse 20102000021P is a direct series variant from the same manufacturer with identical electrical characteristics and approval certifications (cULus). The Eaton BK1/GMC-200-R provides cross-manufacturer compatibility with broader regulatory approvals (CSA, KC, UL) but exhibits lower breaking capacity (35A versus 80A) and reduced melting I²t (0.032 versus 0.12). Selection should be based on application breaking capacity requirements and regulatory certification scope needed for the end application.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 20102000021P be used as a direct replacement for the Littelfuse 20102000021?

A: Yes. Both parts share identical electrical ratings (200 mA, 250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (medium blow), and approval certifications (cULus). The 201P series designation indicates a variant within the same product line with equivalent performance characteristics.

Q: What is the key difference between the Littelfuse and Eaton substitute options?

A: The Eaton BK1/GMC-200-R maintains identical current, voltage, package, and response specifications but has lower breaking capacity (35A versus 80A) and lower melting I²t (0.032 versus 0.12). The Eaton part carries broader regulatory approvals (CSA, KC, UL) compared to the Littelfuse cULus certification.

Q: Are all substitute parts compatible with the same fuse holder?

A: Yes. All parts share the identical 5mm x 20mm package dimensions and require the same holder type. Physical and electrical compatibility with existing fuse holder installations is maintained across all substitutes.

Q: What compliance standards apply to all listed parts?

A: All parts are ROHS3 compliant and REACH unaffected. The Littelfuse parts carry cULus approval, while the Eaton part carries CSA, KC, and UL approvals. Selection should align with specific regulatory requirements of the target application.

Q: Can the Eaton BK1/GMC-200-R be used in applications requiring 80A breaking capacity?

A: No. The Eaton part has a breaking capacity of 35A, which is insufficient for applications designed around the 80A specification of the Littelfuse parts. Application breaking capacity requirements must be verified before substitution.