F520ST-GY Equivalent & Substitute Parts

Part Overview

The F520ST-GY is a 2-position disconnect terminal block connector manufactured by Eaton - Bussmann Electrical Division from the Magnum® F520 series. This component is rated for 6.3 A at 300V (both IEC and UL standards) and accommodates wire gauges from 12-24 AWG. The product is currently obsolete, making identification of compatible substitute components essential for system maintenance and component sourcing.

Substiute Parts

F520ST-GY

Eaton - Bussmann Electrical DivisionIn Stock: 901F520ST-GY Datasheet

Current PartRFQ

41078.2

On Shore Technology Inc.In Stock: 109541078.2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F520ST-GY is determined by the following critical parameters:

• Electrical Compatibility: Current rating of 6.3 A (IEC and UL), voltage rating minimum 300V (IEC) and 300V (UL)
• Physical Compatibility: 2-position, 1-level configuration with 8.0 mm terminal width and screw termination
• Wire Accommodation: Support for wire gauges within or overlapping the 12-24 AWG range
• Functional Compatibility: Disconnect type with fuse and lever mechanism, 5mm x 20mm fuse accommodation
• Material Compliance: Polyamide (PA66) insulation with UL94 V-0 flammability rating

The substitute part 41078.2 meets these criteria with the following considerations: it maintains the same current rating (6.3 A), exceeds the minimum voltage requirement at 400V (IEC), supports a compatible wire gauge range (12-22 AWG), and uses identical insulation material and fuse type specifications.

Parameter Comparison

Engineering Selection Recommendations

The 41078.2 from On Shore Technology Inc. is functionally compatible with the F520ST-GY for applications requiring 2-position disconnect terminal blocks with 6.3 A current rating and 300V minimum voltage operation.

Compatibility Assessment:

The 41078.2 maintains electrical equivalence across current and voltage ratings. The wire gauge range difference (12-22 AWG versus 12-24 AWG) represents a practical limitation: applications using 24 AWG wire cannot use the 41078.2 substitute. The stripping length variance (9 mm versus 10 mm) is a minor mechanical difference that does not affect functional compatibility.

Compliance Considerations:

The F520ST-GY specifies UL94 V-0 flammability rating; the 41078.2 does not provide this specification in the available data. The 41078.2 is ROHS3 compliant and REACH unaffected, whereas the F520ST-GY provides only ECCN and HTSUS classifications. For applications with specific flammability or environmental compliance requirements, these differences must be evaluated against system specifications.

Product Status:

The F520ST-GY is obsolete; the 41078.2 is active production. Component availability and long-term supply chain considerations favor the 41078.2 for new designs or ongoing maintenance sourcing.

Frequently Asked Questions (FAQ)

Q: Can the 41078.2 directly replace the F520ST-GY in all applications?

A: The 41078.2 is compatible for applications using wire gauges 12-22 AWG. If your application requires 24 AWG wire accommodation, the 41078.2 cannot be used as a direct substitute. All other electrical and mechanical parameters are compatible.

Q: What is the significance of the stripping length difference (10 mm vs. 9 mm)?

A: Stripping length defines the amount of insulation that must be removed from the wire before termination. The 41078.2 requires 1 mm less stripped length than the F520ST-GY. This is a minor mechanical difference that does not affect electrical performance if proper termination procedures are followed.

Q: Does the 41078.2 meet the same flammability standards as the F520ST-GY?

A: The F520ST-GY specifies UL94 V-0 flammability rating. The 41078.2 does not provide flammability rating data in the available specifications. For applications with specific flammability requirements, contact the manufacturer to confirm compliance.

Q: Why does the 41078.2 have a higher IEC voltage rating (400V vs. 300V)?

A: The 41078.2 is rated for 400V at IEC standards, which exceeds the F520ST-GY requirement of 300V. This higher rating does not create incompatibility; it indicates the 41078.2 can operate safely in applications up to 400V IEC, making it suitable for F520ST-GY replacement in 300V systems.

Q: Is the 41078.2 available in the same gray color as the F520ST-GY?

A: The 41078.2 is available in beige color, not gray. If color matching is a system requirement, this difference must be considered.

Q: What is the current availability status of these components?

A: The F520ST-GY is obsolete with 876 pieces in current inventory. The 41078.2 is active production with 1022 pieces in current inventory, making it the recommended choice for ongoing sourcing.