USM3 Equivalent & Substitute Parts

Part Overview

The USM3 is a 600V 30A 3-pole mid fuse holder manufactured by Mersen USA Newburyport-MA L.L.C. This component is designed for industrial and commercial electrical distribution applications requiring cartridge fuse protection at 600V with 30A current capacity across three circuits. The product maintains Active status with full ROHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

USM3

Mersen USA Newburyport-MA L.L.C.In Stock: 892USM3 Datasheet

Current PartRFQ

LPSM0003Z

Littelfuse Inc.In Stock: 981LPSM0003Z Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the USM3 is determined by strict alignment of the following electrical and mechanical parameters:

• Voltage Rating: 600V (exact match required)
• Current Rating: 30A (exact match required)
• Number of Circuits: 3-pole configuration (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Configuration: DIN Rail compatibility
• Termination Style: Screw Terminal or Pressure Plate
• Product Status: Active (ensures ongoing manufacturer support)
• Compliance: ROHS3 Compliant (regulatory requirement)

The LPSM0003Z from Littelfuse Inc. meets all substitution criteria as a functionally equivalent 600V 30A 3-circuit cartridge fuse holder with DIN Rail mounting and compatible termination methods.

Parameter Comparison

Engineering Selection Recommendations

Both the USM3 and LPSM0003Z are Active products with ROHS3 compliance, ensuring regulatory alignment and ongoing manufacturer support. Selection between these parts should be based on:

• Inventory availability and lead time requirements
• Existing supply chain relationships with Mersen or Littelfuse
• Physical space constraints within the electrical enclosure (fuse size compatibility)
• Termination method compatibility with existing wiring infrastructure
• Cost considerations and procurement agreements

The LPSM0003Z is specified for use with 5AG, 13/32" x 1-1/2" (Midget) cartridge fuses, confirming mechanical compatibility with standard industrial fuse dimensions.

Frequently Asked Questions (FAQ)

Q: Can the LPSM0003Z directly replace the USM3 in existing installations?

A: Yes, provided that the fuse size (10mm x 38mm cartridge) is compatible with the existing fuse inventory and that the DIN Rail mounting configuration matches the installation requirements. Both parts share identical electrical ratings (600V, 30A, 3-circuit) and termination methods.

Q: What are the key parameters that determine substitution eligibility?

A: Voltage rating (600V), current rating (30A), number of circuits (3-pole/3-circuit), fuse type (cartridge), mounting method (DIN Rail), and compliance status (ROHS3) must all match exactly. Deviations in any of these parameters disqualify a part from substitution.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the USM3 and LPSM0003Z are ROHS3 compliant and maintain Active product status, ensuring they meet the same regulatory requirements for industrial electrical applications.

Q: What should be verified before implementing a substitution?

A: Confirm that the fuse cartridge dimensions (10mm x 38mm) are compatible with existing fuse stock, verify that the DIN Rail mounting footprint matches the installation space, and ensure that the screw terminal or pressure plate termination method aligns with the existing electrical connections.