CHM3 Equivalent & Substitute Parts

Part Overview

The CHM3 is a 3-circuit cartridge fuse holder manufactured by Eaton - Bussmann Electrical Division, rated for 32 A at 690V with DIN Rail mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, repair, and component sourcing in applications requiring cartridge fuse protection at high voltage levels.

Substiute Parts

CHM3

Eaton - Bussmann Electrical DivisionIn Stock: 861CHM3 Datasheet

Current PartRFQ

LPSM0003Z

Littelfuse Inc.In Stock: 981LPSM0003Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CHM3 is determined by the following critical parameters that must align for functional equivalence:

• Mounting Type: DIN Rail installation compatibility
• Number of Circuits: 3-circuit configuration
• Fuse Size: 10mm x 38mm cartridge dimensions (5AG Midget standard)
• Termination Style: Screw terminal connection method
• Voltage Rating: Minimum 600V operation (CHM3 operates at 690V)
• Current Rating: Minimum 30 A capacity (CHM3 rated at 32 A)

The LPSM0003Z from Littelfuse Inc. meets these substitution criteria. While the voltage rating is 600V compared to the CHM3's 690V, and the current rating is 30 A versus 32 A, both parameters remain within acceptable operational margins for equivalent fuse holder functionality in cartridge-based protection circuits.

Parameter Comparison

Engineering Selection Recommendations

The LPSM0003Z is an active product from Littelfuse Inc., providing supply continuity for the obsolete CHM3. Both components share identical mechanical form factors (10mm x 38mm cartridge, DIN Rail mounting, 3-circuit configuration) and termination methods (screw terminal).

The LPSM0003Z carries RoHS3 compliance, providing environmental regulatory alignment for new installations and system upgrades. Both parts maintain REACH Unaffected status, confirming compliance with chemical substance restrictions.

The voltage and current rating differential (600V/30A versus 690V/32A) represents a conservative substitution margin. System designers must confirm that application voltage and current requirements do not exceed the LPSM0003Z specifications before implementation.

Frequently Asked Questions (FAQ)

Q: Can the LPSM0003Z directly replace the CHM3 in existing installations?

A: Mechanical and electrical compatibility is confirmed for DIN Rail mounting, 3-circuit cartridge fuse holder applications using 5AG Midget fuses. Verify that system voltage does not exceed 600V and current load does not exceed 30 A.

Q: What is the significance of the voltage rating difference (690V vs. 600V)?

A: The CHM3 operates at a higher voltage rating. The LPSM0003Z at 600V is suitable for systems operating at or below 600V. Applications requiring 690V operation must use components rated for that voltage level.

Q: What is the significance of the current rating difference (32A vs. 30A)?

A: The CHM3 is rated for 32 A maximum current. The LPSM0003Z is rated for 30 A. Applications requiring current capacity above 30 A must use components rated for higher amperage.

Q: Are the termination styles compatible?

A: Both components feature screw terminal termination. The LPSM0003Z additionally offers pressure plate termination, providing installation flexibility. Existing screw terminal connections are compatible with both parts.

Q: What packaging is available for the LPSM0003Z?

A: The LPSM0003Z is supplied in box packaging, suitable for standard component handling and storage in industrial environments.

Q: Are both parts compliant with environmental regulations?

A: Both the CHM3 and LPSM0003Z maintain REACH Unaffected status. The LPSM0003Z additionally carries RoHS3 compliance, meeting current environmental standards for electronic component manufacturing.