ATDR20 Equivalent & Substitute Parts Reference

Part Overview

The ATDR20 is a Class CC time-delay (slow-blow) fuse rated for 20A at 600V AC, manufactured by Mersen USA Newburyport-MA L.L.C. This cartridge fuse is designed for circuit protection in industrial and commercial applications requiring coordinated protection with motor and transformer loads. The part is currently active in production with 775 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when supply chain optimization is required.

Substiute Parts

ATDR20

Mersen USA Newburyport-MA L.L.C.In Stock: 796ATDR20 Datasheet

Current PartRFQ

KLDR020.TXP

Littelfuse Inc.In Stock: 886KLDR020.TXP Datasheet

SimilarRFQ

LP-CC-20

Eaton - Bussmann Electrical DivisionIn Stock: 811LP-CC-20 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATDR20 are qualified based on the following critical parameters that must match or exceed the main part specifications:

• Current Rating: 20A (exact match required)
• Voltage Rating - AC: 600 VAC (minimum requirement)
• Fuse Class: CC (exact match required)
• Response Time: Slow Blow (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Requires Holder (functional equivalence)

Both identified substitutes meet these core electrical and mechanical criteria, ensuring direct functional replacement in applications designed for the ATDR20.

Parameter Comparison

Engineering Selection Recommendations

All three parts are active products with current manufacturing status. The KLDR020.TXP (Littelfuse POWR-GARD® KLDR series) and LP-CC-20 (Eaton Low-Peak™ LP-CC series) are direct functional equivalents to the ATDR20, meeting all critical electrical parameters: 20A current rating, 600 VAC voltage rating, CC class, and slow-blow response time.

The KLDR020.TXP and LP-CC-20 both provide ROHS3 compliance, whereas the ATDR20 is RoHS non-compliant. Both substitutes carry recognized approval agencies (CE, CSA, and either UL or UR certification), supporting their use in regulated industrial applications.

Selection between substitutes should be based on supply availability, lead time requirements, and existing component qualification within the target application. All three parts are functionally interchangeable for Class CC cartridge fuse applications requiring 20A protection at 600 VAC.

Frequently Asked Questions (FAQ)

Q: Can KLDR020.TXP or LP-CC-20 be used as direct replacements for ATDR20?

A: Yes. Both substitutes meet the critical electrical specifications: 20A current rating, 600 VAC voltage rating, CC class, and slow-blow response time. Both are cartridge fuses requiring a holder, matching the ATDR20 mounting requirement.

Q: What is the difference between the KLDR020.TXP and LP-CC-20?

A: Both parts are electrically and mechanically equivalent. The primary differences are manufacturer (Littelfuse vs. Eaton), series designation (POWR-GARD® KLDR vs. Low-Peak™ LP-CC), and certification bodies (UL vs. UR). Physical dimensions are nearly identical (10mm x 38mm midget cartridge format).

Q: Does RoHS compliance affect substitution eligibility?

A: The ATDR20 is RoHS non-compliant, while both substitutes are ROHS3 compliant. For applications subject to RoHS regulations, the KLDR020.TXP or LP-CC-20 are preferred. For legacy systems without RoHS requirements, all three parts remain functionally equivalent.

Q: Are there voltage or current rating differences between these parts?

A: No. All three parts are rated for 20A at 600 VAC. The KLDR020.TXP and LP-CC-20 additionally specify 300 VDC capability, which is not specified for the ATDR20 but does not affect AC-only applications.

Q: What is the breaking capacity, and does it matter for substitution?

A: The KLDR020.TXP and LP-CC-20 both specify 200kA AC and 20kA DC breaking capacity. This parameter is not specified for the ATDR20. Breaking capacity should be verified against circuit design requirements; if the ATDR20 was previously qualified for the application, the equivalent breaking capacity of the substitutes supports continued use.

Q: Do these fuses require a specific holder?

A: All three parts are cartridge fuses requiring a holder. The KLDR020.TXP and LP-CC-20 use the 5AG midget cartridge format (10mm x 38mm). Verify that existing holders are compatible with this standard format before substitution.