F520STLED220-GY Equivalent & Substitute Parts

Part Overview

The F520STLED220-GY is a 2-position disconnect terminal block connector manufactured by Eaton - Bussmann Electrical Division from the Magnum® F520 series. This component is designed for applications requiring screw termination with integrated fuse and lever disconnect functionality, rated for 6.3 A at 300V (IEC/UL). The part is currently obsolete, making identification of suitable substitute components essential for ongoing maintenance, repair, and new design implementations where equivalent functionality is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	F520STLED220-GY
Manufacturer	Eaton - Bussmann Electrical Division
Category	Terminal Blocks
Type	Disconnect
Number of Positions	2
Number of Levels	1
Termination Style	Screw
Current Rating (IEC/UL)	6.3 A
Voltage Rating (IEC/UL)	300V
Wire Gauge Range	12-24 AWG (0.5-4 mm²)
Terminal Width	8.0 mm
Disconnect Type	Fuse, Lever
Fuse Type	5mm x 20mm
Material - Insulation	Polyamide (PA66), Nylon 6/6
Material Flammability Rating	UL94 V-0
Color	Gray
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the F520STLED220-GY is determined by strict alignment with the following critical parameters:

Electrical Compatibility: Current rating of 6.3 A minimum and voltage rating of 300V minimum (IEC and UL standards)
Mechanical Compatibility: 2-position, 1-level configuration with 8.0 mm terminal width and screw termination style
Functional Compatibility: Disconnect type with fuse and lever mechanism; 5mm x 20mm fuse accommodation
Wire Gauge Compatibility: Support for 12-24 AWG wire range (0.5-4 mm²) or compatible subset
Material Specification: Polyamide (PA66) insulation material with UL94 V-0 flammability rating

The substitute part 41078.2 (On Shore Technology Inc., SRSI series) meets these criteria with the following alignment: 2-position disconnect configuration, 6.3 A current rating, 300V UL voltage rating, 8.0 mm terminal width, screw termination, fuse and lever disconnect type, 5mm x 20mm fuse type, and PA66 insulation material.

Parameter Comparison

Parameter	F520STLED220-GY (Main)	41078.2 (Substitute)
Manufacturer	Eaton - Bussmann	On Shore Technology Inc.
Series	Magnum® F520	SRSI
Number of Positions	2	2
Number of Levels	1	1
Type	Disconnect	Disconnect
Disconnect Type	Fuse, Lever	Fuse, Lever
Termination Style	Screw	Screw
Terminal Width	8.0 mm	8.0 mm
Current - IEC	6.3 A	6.3 A
Voltage - IEC	300V	400V
Current - UL	6.3 A	6.3 A
Voltage - UL	300V	300V
Wire Gauge Range - AWG	12-24 AWG	12-22 AWG
Wire Gauge Range - mm²	0.5-4 mm²	0.2-4 mm²
Fuse Type	5mm x 20mm	5mm x 20mm
Material - Insulation	Polyamide (PA66), Nylon 6/6	Polyamide (PA66), Nylon 6/6
Color	Gray	Beige
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 41078.2 terminal block from On Shore Technology Inc. is a functional substitute for the obsolete F520STLED220-GY. Both components share identical electrical ratings (6.3 A, 300V UL), mechanical configuration (2-position, 8.0 mm terminal width), and disconnect mechanism (fuse and lever type with 5mm x 20mm fuse accommodation).

The substitute part offers the advantage of active product status, ensuring ongoing availability and supply chain continuity. The SRSI series maintains PA66 insulation material compatibility with the original Magnum® F520 series. Wire gauge compatibility is maintained within the critical 12-22 AWG range, which covers standard industrial applications. The IEC voltage rating of 400V on the substitute part exceeds the original 300V specification, providing additional margin in IEC-compliant applications.

Packaging is supplied in bulk format for the substitute part, compared to the original specification. Physical form factor and terminal geometry remain consistent between both components, supporting direct mechanical integration in existing designs.

Frequently Asked Questions (FAQ)

Q: Can 41078.2 be used as a direct replacement for F520STLED220-GY in all applications?

A: Yes, within the specified electrical and mechanical parameters. Both components are rated for 6.3 A at 300V (UL), feature 2-position disconnect configuration with fuse and lever mechanism, and accommodate 5mm x 20mm fuses. Wire gauge compatibility is maintained for standard 12-22 AWG applications. Physical terminal width (8.0 mm) and screw termination style are identical.

Q: What is the difference in wire gauge range between the two parts?

A: The F520STLED220-GY supports 12-24 AWG (0.5-4 mm²), while 41078.2 supports 12-22 AWG (0.2-4 mm²). For applications using 23-24 AWG wire, the original part specification is required. For standard industrial applications using 12-22 AWG, both parts are compatible.

Q: Does the color difference (Gray vs. Beige) affect functionality?

A: No. Color is a cosmetic parameter and does not affect electrical performance, mechanical compatibility, or functional operation. Both parts use identical PA66 insulation material and UL94 V-0 flammability rating.

Q: What is the significance of the higher IEC voltage rating on 41078.2?

A: The substitute part is rated for 400V IEC compared to 300V on the original part. This provides additional safety margin in IEC-compliant applications and does not create compatibility issues when used in 300V circuits.

Q: Is the substitute part RoHS and REACH compliant?

A: The 41078.2 is ROHS3 compliant and REACH unaffected. Compliance documentation should be verified with the supplier for specific application requirements.

Q: What packaging format is available for the substitute part?

A: The 41078.2 is supplied in bulk packaging, compared to the original part specification. Minimum order quantities and packaging configurations should be confirmed with the distributor.

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