LSSU Fuse Holder - Equivalent & Substitute Parts

Part Overview

The LSSU is a threaded chassis mount fuse holder manufactured by Littelfuse Inc., rated for 15A at 125V with single circuit configuration. Designed for Edison plug compatibility, this component is actively produced and maintains 950 units in current inventory. Substitute parts may be required due to supply constraints, design revisions, or application-specific mounting preferences while maintaining equivalent electrical and mechanical performance within the specified parameters.

Substiute Parts

LSSU

Littelfuse Inc.In Stock: 975LSSU Datasheet

Current PartRFQ

SSU-131MAT

Mitsumi Electric Company LtdIn Stock: 1000SSU-131MAT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SSU-131MAT has been identified as a manufacturer-recommended substitute. However, critical parameter misalignment exists between the LSSU and SSU-131MAT that prevents direct substitution:

LSSU Defining Parameters:

• Current Rating: 15 A
• Voltage Rating: 125V
• Fuseholder Type: Holder
• Fuse Type: Threaded
• Mounting: Chassis Mount
• Circuits: 1

SSU-131MAT Defining Parameters:

• Current Rating: 300mA (DC)
• Voltage Rating: 4V (DC)
• Component Type: Slide Switch (SP3T)
• Mounting: Surface Mount, Right Angle
• Circuits: SP3T (3-position)

The SSU-131MAT is a slide switch, not a fuse holder. The electrical ratings (300mA at 4V versus 15A at 125V) and functional purpose differ fundamentally. This part cannot serve as an equivalent substitute for the LSSU in applications requiring fuse protection at the specified voltage and current levels.

Parameter Comparison

Engineering Selection Recommendations

Based on the provided parameters, the SSU-131MAT cannot be selected as a substitute for the LSSU. The parts serve different functional purposes: the LSSU is a fuse holder for overcurrent protection at 15A/125V, while the SSU-131MAT is a low-voltage slide switch rated for 300mA at 4V DC. Electrical ratings differ by two orders of magnitude in current capacity and by more than 30 times in voltage rating. Mounting architectures are incompatible (chassis mount versus surface mount). RoHS compliance status also differs.

For applications requiring LSSU replacement, equivalent fuse holders must maintain the 15A/125V electrical specification, threaded fuse type, single-circuit configuration, and chassis mount form factor.

Frequently Asked Questions (FAQ)

Q: Can SSU-131MAT replace LSSU in my application? A: No. SSU-131MAT is a slide switch rated for 300mA at 4V DC. The LSSU is a fuse holder rated for 15A at 125V. These are different component categories with incompatible electrical ratings and functions.

Q: What parameters must an equivalent fuse holder maintain? A: Current rating of 15A, voltage rating of 125V, threaded fuse type, single-circuit configuration, and chassis mount mounting style are the critical parameters for substitution.

Q: Why is RoHS compliance different between these parts? A: The LSSU is RoHS non-compliant while SSU-131MAT is RoHS compliant. This reflects different manufacturing standards and material compositions. RoHS compliance status cannot be changed through substitution without design modification.

Q: Are there packaging differences between these parts? A: Yes. The LSSU uses standard packaging for chassis-mount components, while SSU-131MAT is supplied in Tape & Reel (TR) format typical for surface-mount components. Packaging format reflects the mounting architecture and assembly process requirements.

Q: What is the inventory status for these parts? A: LSSU has 950 units in stock. SSU-131MAT has 896 units in stock. However, inventory availability does not override electrical or functional incompatibility.