LVR033K Equivalent & Substitute Parts

Part Overview

The LVR033K is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® LVR series. This component provides overcurrent protection at 240V (265V internal rating) with a 330 mA hold current and 740 mA trip current. The device is designed for through-hole radial mounting in disc configuration and is currently in active production status. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained within the specified tolerances for this product category.

Substiute Parts

LVR033K

Littelfuse Inc.In Stock: 1213LVR033K Datasheet

Current PartRFQ

LVR033S

LittelfuseIn Stock: 1770LVR033S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LVR033K is determined by strict equivalence across the following critical parameters:

• Voltage rating: 240V (265V internal)
• Current hold specification: 330 mA maximum
• Current trip specification: 740 mA
• Maximum current capacity: 4.5 A
• Trip time: 21 seconds
• Initial resistance: 770 mOhms minimum
• Post-trip resistance: 2.6 Ohms maximum
• Operating temperature range: -20°C to 85°C
• Mounting configuration: Through hole radial disc
• Lead spacing: 0.200" (5.08mm)
• Regulatory compliance: CQC, CSA, TUV, UL certifications
• Environmental compliance: ROHS3 compliant

The LVR033S qualifies as a direct substitute based on identical electrical specifications and equivalent mechanical compatibility within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

Both the LVR033K and LVR033S are active production components from Littelfuse Inc. with identical electrical performance specifications. Selection between these parts is based on physical height requirements within the application. The LVR033K has a maximum seated height of 0.748" (19.00mm), while the LVR033S has a maximum seated height of 0.650" (16.50mm). Both components maintain full compliance with CQC, CSA, TUV, and UL certifications and are ROHS3 compliant. Component selection should be determined by available PCB or mounting space height constraints.

Frequently Asked Questions (FAQ)

Q: Can LVR033S replace LVR033K in all applications?

A: The LVR033S is electrically equivalent to the LVR033K across all specified parameters. The primary difference is physical height. Substitution is valid when the application accommodates the 0.650" (16.50mm) maximum seated height of the LVR033S.

Q: What are the critical parameters for substitution compatibility?

A: Voltage rating (240V/265V internal), current hold (330 mA), current trip (740 mA), trip time (21 seconds), resistance specifications, operating temperature range (-20°C to 85°C), and lead spacing (0.200"/5.08mm) must remain identical. Both parts meet these requirements.

Q: Are both parts certified to the same standards?

A: Yes. Both LVR033K and LVR033S carry identical regulatory approvals: CQC, CSA, TUV, and UL certifications. Both are ROHS3 compliant.

Q: What is the only mechanical difference between these parts?

A: The seated height differs. LVR033K maximum height is 0.748" (19.00mm). LVR033S maximum height is 0.650" (16.50mm). All other dimensions, including length (0.449"/11.40mm), width (0.150"/3.80mm), and lead spacing (0.200"/5.08mm), are identical.

Q: Can I use LVR033K where LVR033S is specified?

A: Yes, provided the application has sufficient vertical clearance to accommodate the 0.748" (19.00mm) maximum height of the LVR033K.