A6T30 Equivalent & Substitute Parts

Part Overview

The A6T30 is a 600V 30A Class T fuse manufactured by Mersen USA Newburyport-MA L.L.C. This cartridge fuse is designed for electrical and industrial applications requiring fast-blow protection at 30 amperes and 600 volts AC. The part is currently active in production with 1096 units in stock. Finding equivalent substitute parts is necessary to ensure supply chain continuity, optimize procurement options, and maintain operational flexibility when the primary part becomes unavailable or when alternative sourcing is preferred.

Substiute Parts

A6T30

Mersen USA Newburyport-MA L.L.C.In Stock: 1126A6T30 Datasheet

Current PartRFQ

JJS-30

Eaton - Bussmann Electrical DivisionIn Stock: 748JJS-30 Datasheet

SimilarRFQ

JLLS030.T

Littelfuse Inc.In Stock: 859JLLS030.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A6T30 are qualified based on the following critical electrical and mechanical parameters:

• Current Rating: 30A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Fuse Class: T (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Requires Holder (functional equivalence)

The two identified substitute parts—JJS-30 (Eaton - Bussmann Electrical Division) and JLLS030.T (Littelfuse Inc.)—meet all critical electrical parameters and are functionally equivalent cartridge fuses suitable for direct substitution in applications requiring 30A, 600VAC Class T protection.

Parameter Comparison

Engineering Selection Recommendations

All three parts—A6T30, JJS-30, and JLLS030.T—are active products with current manufacturing status. Selection between these parts should be based on the following considerations:

A6T30 (Mersen): Primary choice for applications where RoHS non-compliance is acceptable or required by legacy system specifications. Currently maintains 1096 units in stock.

JJS-30 (Eaton - Bussmann Electrical Division): Suitable for applications requiring RoHS compliance. Carries UL, CSA, and CE certifications. Inventory of 670 units available. Packaged in bulk format.

JLLS030.T (Littelfuse Inc.): Suitable for applications requiring RoHS compliance with dual voltage capability (600 VAC / 300 VDC). Carries UR, CSA, and CE certifications. Inventory of 775 units available. Packaged in box format. Offers extended voltage range for mixed AC/DC circuit applications.

For AC-only 600V applications, JJS-30 and JLLS030.T are electrically equivalent. For applications requiring DC voltage capability, JLLS030.T provides additional operational flexibility at 300 VDC.

Frequently Asked Questions (FAQ)

Q: Can JJS-30 and JLLS030.T be used interchangeably with A6T30?

A: Yes, for 600 VAC applications. Both substitute parts meet the critical electrical parameters: 30A current rating, 600 VAC voltage rating, Class T fuse class, and fast-blow response time. Physical dimensions differ slightly, but both are cartridge fuses requiring a holder for mounting.

Q: What is the difference between JJS-30 and JLLS030.T?

A: The primary difference is voltage rating capability. JLLS030.T supports both 600 VAC and 300 VDC operation, while JJS-30 is rated for 600 VAC only. Both have identical current ratings (30A), fuse class (T), and response time (fast blow). JLLS030.T is packaged in boxes; JJS-30 is packaged in bulk. Both are RoHS compliant.

Q: Are there physical dimension differences between these fuses?

A: Yes. JJS-30 dimensions are 0.500" Dia x 1.885" L (12.70mm x 47.88mm). JLLS030.T dimensions are 0.563" Dia x 1.500" L (14.30mm x 38.10mm). Verify that the fuse holder accommodates the selected cartridge dimensions before installation.

Q: Which substitute part should I select for new designs?

A: For new designs requiring RoHS compliance, either JJS-30 or JLLS030.T is appropriate. If the application involves any DC voltage circuits, JLLS030.T provides dual-voltage capability. Confirm holder compatibility with the selected cartridge dimensions.

Q: What certifications do the substitute parts carry?

A: JJS-30 carries CE, CSA, and UL certifications. JLLS030.T carries CE, CSA, and UR certifications. Both meet industrial and electrical application standards.

Q: Is packaging format a consideration for substitution?

A: Packaging format does not affect electrical or mechanical compatibility. A6T30 and JLLS030.T are supplied in boxes; JJS-30 is supplied in bulk. Select based on procurement and inventory management requirements.