LVR125S Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The LVR125S is a polymeric PTC (Positive Temperature Coefficient) resettable fuse manufactured by Littelfuse Inc., designed for overcurrent protection in 240V circuits with a 1.25A hold current rating. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations. The substitute part maintains identical electrical and mechanical specifications while offering current production availability.

Substiute Parts

LVR125S

Littelfuse Inc.In Stock: 726LVR125S Datasheet

Current PartRFQ

LVR125S-240

Littelfuse Inc.In Stock: 9150LVR125S-240 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LVR125S is determined by strict equivalence across the following critical parameters:

• Voltage rating: 240V (265V internal) maximum
• Current hold specification: 1.25 A
• Current trip specification: 2.5 A
• Time to trip: 23 seconds
• Initial and post-trip resistance values
• Operating temperature range: -20°C to 85°C
• Physical form factor: Through-hole radial disc package
• Mechanical dimensions and lead spacing
• Regulatory compliance: CQC, CSA, TUV, UL certifications
• Environmental compliance: ROHS3

The substitute part LVR125S-240 matches all specified electrical and mechanical parameters, with the primary distinction being product status (active vs. obsolete) and packaging configuration (bulk vs. standard).

Parameter Comparison

Engineering Selection Recommendations

The LVR125S-240 is the direct parametric equivalent for the obsolete LVR125S. All electrical characteristics, mechanical dimensions, and regulatory certifications are identical. The primary advantage of LVR125S-240 is its active product status, ensuring continued availability and supply chain reliability.

Both parts carry identical regulatory approvals (CQC, CSA, TUV, UL) and environmental compliance (ROHS3). The packaging difference (bulk vs. standard) does not affect electrical or mechanical performance and is determined by procurement requirements rather than technical compatibility.

For applications currently using LVR125S, direct substitution with LVR125S-240 is supported by complete parameter equivalence across all specified electrical and mechanical criteria.

Frequently Asked Questions (FAQ)

Q: Can LVR125S-240 be used as a direct replacement for LVR125S?

A: Yes. All electrical parameters, mechanical dimensions, lead spacing, and regulatory certifications are identical. The parts are parametrically equivalent and functionally interchangeable in circuit applications.

Q: What is the difference between LVR125S and LVR125S-240?

A: The primary differences are product status (LVR125S is obsolete; LVR125S-240 is active) and packaging configuration (standard vs. bulk). Electrical and mechanical specifications are identical.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions: 0.835" diameter × 0.209" thickness (21.20mm × 5.30mm), height of 1.079" (27.40mm), and lead spacing of 0.400" (10.15mm). They are mechanically interchangeable in through-hole PCB applications.

Q: Do both parts have the same regulatory certifications?

A: Yes. Both LVR125S and LVR125S-240 carry CQC, CSA, TUV, and UL approvals and are ROHS3 compliant.

Q: What is the hold current rating?

A: Both parts have a hold current (Ih) of 1.25 A at 240V maximum voltage (265V internal rating).

Q: What is the trip current specification?

A: The trip current (It) is 2.5 A for both parts, with a maximum current rating of 12.5 A and a time to trip of 23 seconds.

Q: Are there any temperature operating range differences?

A: No. Both parts operate across the identical temperature range of -20°C to 85°C.