LT301003C Equivalent & Substitute Parts

Part Overview

The LT301003C is a 100 A, 300V, 3-circuit cartridge fuse block designed for chassis mount applications. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing maintenance, repair, and system upgrades. The fuse block accommodates Class T cartridge fuses with box lug termination and is rated for unlimited moisture sensitivity conditions.

Substiute Parts

LT301003C

Littelfuse Inc.In Stock: 1105LT301003C Datasheet

Current PartRFQ

LFT301003CS

Littelfuse Inc.In Stock: 919LFT301003CS Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LT301003C is determined by strict equivalence across the following critical parameters:

• Current Rating: 100 A (exact match required)
• Voltage Rating: 300V (exact match required)
• Number of Circuits: 3 (exact match required)
• Fuse Type: Cartridge (exact match required)
• Fuse Size: 0.813" Dia x 2.16" L / 20.65mm x 54.8mm (exact match required)
• Fuseholder Type: Block (exact match required)
• Termination Style: Box Lug (exact match required)
• For Use With: Class T Fuses (exact match required)

The LFT301003CS meets all electrical and mechanical equivalence criteria. The primary difference is the mounting configuration: the substitute part is designed for DIN rail mounting rather than chassis mounting. This distinction affects installation methodology but does not alter electrical performance or fuse compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LFT301003CS is the direct electrical and mechanical equivalent to the LT301003C. Both parts maintain identical current, voltage, circuit count, fuse type, and termination specifications. The LFT301003CS is currently in active production status, whereas the LT301003C is obsolete.

The LFT301003CS achieves ROHS3 compliance, whereas the LT301003C does not meet RoHS requirements. For applications subject to RoHS directives or environmental regulations, the LFT301003CS is the appropriate selection.

The primary consideration for substitution is mounting configuration. The LT301003C is designed for direct chassis mounting via box lugs, while the LFT301003CS is configured for DIN rail installation. System integration methodology must accommodate this difference. Both parts accept identical Class T cartridge fuses and provide equivalent electrical protection.

Frequently Asked Questions (FAQ)

Q: Can the LFT301003CS replace the LT301003C in existing installations?

A: Electrical compatibility is complete. The LFT301003CS provides identical current, voltage, circuit, and fuse specifications. Physical installation differs due to mounting type: the LT301003C uses chassis mount configuration while the LFT301003CS requires DIN rail infrastructure. System redesign or adapter solutions may be necessary depending on existing mounting hardware.

Q: What is the significance of the RoHS compliance difference?

A: The LT301003C is RoHS non-compliant; the LFT301003CS is ROHS3 compliant. For applications operating under RoHS directives or in regulated environments, the LFT301003CS is the required selection. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Are the fuse cartridges interchangeable between these two fuse blocks?

A: Yes. Both the LT301003C and LFT301003CS accept identical Class T cartridge fuses sized 0.813" Dia x 2.16" L (20.65mm x 54.8mm). Fuse selection and replacement procedures are identical for both blocks.

Q: What is the difference between chassis mount and DIN rail mounting?

A: Chassis mount (LT301003C) uses box lug terminals for direct connection to chassis or panel surfaces. DIN rail mount (LFT301003CS) uses standardized DIN rail infrastructure for modular installation in control cabinets and enclosures. The electrical performance and fuse compatibility remain unchanged; only the physical installation method differs.

Q: Is the LT301003C still available for purchase?

A: The LT301003C is classified as obsolete. The LFT301003CS is the active production equivalent and is the recommended selection for new designs and ongoing procurement.