LA70Q604 Fuse Cartridge Equivalent & Substitute Parts

Part Overview

The LA70Q604 is a 60A cartridge fuse rated for 700 VAC and 650 VDC applications, designed for bolt mount installation in electrical and industrial systems. This part is classified as obsolete, making identification of suitable substitutes necessary for ongoing system maintenance and component procurement.

The primary reason for seeking alternatives is the obsolete product status, which limits availability for future orders and system repairs. Active substitute parts maintain functional compatibility while offering improved availability and extended product support.

Substiute Parts

LA70Q604

Littelfuse Inc.In Stock: 1070LA70Q604 Datasheet

Current PartRFQ

L70QS060.V

Littelfuse Inc.In Stock: 946L70QS060.V Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LA70Q604 is based on the following critical parameters that must remain constant or be exceeded:

• Current Rating: Must equal 60A
• Voltage Rating - AC: Must equal or exceed 700 VAC
• Voltage Rating - DC: Must equal or exceed 650 VDC
• Fuse Type: Must be Cartridge
• Mounting Type: Must be Bolt Mount
• Package / Case: Must be Cylindrical, Blade Terminal (Bolt)

The substitute part L70QS060.V meets all these criteria while offering enhanced specifications in breaking capacity and operating temperature range. The DC voltage rating increases from 650 VDC to 700 VDC, providing additional margin for system protection.

Parameter Comparison

Engineering Selection Recommendations

The L70QS060.V is the manufacturer-recommended substitute for the LA70Q604. Selection is based on the following factors:

• Product Status: The L70QS060.V maintains active product status with ongoing manufacturer support, whereas the LA70Q604 is obsolete.
• Compliance & Certifications: The substitute carries expanded approval certifications (CE, cURus, UR) compared to the original part (UR only), providing broader regulatory acceptance.
• Electrical Performance: The substitute meets or exceeds all critical electrical parameters, including voltage ratings and breaking capacity.
• RoHS Compliance: Both parts maintain ROHS3 compliance, ensuring environmental regulatory alignment.

The L70QS060.V is suitable for direct replacement in applications where the LA70Q604 was previously specified.

Frequently Asked Questions (FAQ)

Q: Can the L70QS060.V be used as a direct replacement for the LA70Q604?

A: Yes. The L70QS060.V meets all functional requirements of the LA70Q604, including current rating (60A), AC voltage rating (700 VAC), and mounting configuration (bolt mount). The substitute provides equal or superior performance across all specified parameters.

Q: What is the difference in physical dimensions between these parts?

A: The LA70Q604 measures 1.000" Dia x 2.874" L (25.40mm x 73.00mm). The L70QS060.V measures 1.000" Dia x 4.375" L (25.40mm x 111.13mm). The diameter remains identical; the length increases by approximately 1.5 inches. Verify mounting cavity dimensions before installation.

Q: Are there any voltage rating differences?

A: The DC voltage rating differs: LA70Q604 is rated 650 VDC, while L70QS060.V is rated 700 VDC. This represents an increase in protection margin and does not affect compatibility in applications designed for the original part.

Q: What certifications does the substitute carry?

A: The L70QS060.V carries CE, cURus, and UR certifications, compared to UR only for the LA70Q604. This expanded certification scope may be beneficial for systems requiring multiple regulatory approvals.

Q: Is the response time different between these parts?

A: The LA70Q604 does not specify response time. The L70QS060.V is rated as Fast Blow. Verify that Fast Blow response characteristics are compatible with your application requirements.