RT500AS3R30KB Equivalent & Substitute Parts

Part Overview

The RT500AS3R30KB is a 3.3 Ohm, 500W wirewound linear potentiometer manufactured by Vishay Sfernice, designed for panel mount applications with a 1-turn adjustment mechanism and solder turret termination. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations where equivalent functionality is required.

Substiute Parts

RT500AS3R30KB

Vishay SferniceIn Stock: 1008RT500AS3R30KB Datasheet

Current PartRFQ

RRS3R0E

OhmiteIn Stock: 747RRS3R0E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The RRS3R0E from Ohmite qualifies as a substitute for the RT500AS3R30KB based on the following critical parameters:

• Resistance value within tolerance band: 3 Ohms (RT500AS3R30KB: 3.3 Ohms) — both fall within the ±10% tolerance specification for wirewound potentiometers in this power class
• Identical power rating: 500W
• Matching taper classification: Linear
• Identical number of turns: 1
• Identical resistive material: Wirewound
• Identical mounting configuration: Panel Mount
• Matching tolerance: ±10%
• Identical gang configuration: 1 Gang

The RRS3R0E maintains functional equivalence across all primary electrical and mechanical parameters that define substitutability for this component category.

Parameter Comparison

Engineering Selection Recommendations

The RRS3R0E represents the primary substitute for the obsolete RT500AS3R30KB. Selection of this substitute is supported by:

• Active product status of the RRS3R0E ensures ongoing availability and manufacturing support
• ROHS3 compliance of the RRS3R0E satisfies modern environmental and regulatory requirements
• Electrical equivalence across all critical parameters (resistance tolerance band, power rating, taper, turns, material, and gang configuration)
• Mechanical compatibility for panel mount applications

Physical differences exist in actuator geometry (round versus flatted) and termination style (solder turret versus solder lug). These differences require mechanical and electrical interface verification during integration into existing assemblies.

Frequently Asked Questions (FAQ)

Q: Can the RRS3R0E directly replace the RT500AS3R30KB in existing designs?

A: The RRS3R0E provides electrical and functional equivalence. However, mechanical interface differences (actuator type and termination style) require verification against the specific mounting and connection requirements of the application before implementation.

Q: What is the resistance tolerance relationship between 3.3 Ohms and 3 Ohms?

A: Both values fall within the ±10% tolerance specification for this component category. The 3.3 Ohm specification and 3 Ohm specification are compatible within the defined tolerance band for wirewound potentiometer substitution.

Q: Why is the RT500AS3R30KB classified as obsolete?

A: Obsolete status indicates the component is no longer manufactured by Vishay Sfernice. The RRS3R0E, with active product status, provides continued availability for equivalent functionality.

Q: Are there compliance differences between the two parts?

A: The RRS3R0E carries ROHS3 compliance certification, while the RT500AS3R30KB does not specify RoHS status. This difference may be relevant for applications subject to environmental or regulatory compliance requirements.

Q: What mechanical differences should be considered?

A: The RT500AS3R30KB features a round actuator with solder turret termination, while the RRS3R0E features a flatted actuator with solder lug termination. Panel mount compatibility is maintained, but mechanical fit and electrical connection methods differ and require application-specific verification.