RT500AS3000KB Equivalent & Substitute Parts

Part Overview

The RT500AS3000KB is a 300 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, repair, and new design implementations where equivalent functionality is required.

Substiute Parts

RT500AS3000KB

Vishay SferniceIn Stock: 1024RT500AS3000KB Datasheet

Current PartRFQ

RUS300E

OhmiteIn Stock: 757RUS300E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS3000KB is determined by the following critical parameters that must remain consistent:

• Resistance value: 300 Ohms (exact match required)
• Tolerance: ±10% (electrical accuracy specification)
• Taper characteristic: Linear (functional response curve)
• Number of turns: 1 (adjustment range and resolution)
• Number of gangs: 1 (single channel configuration)
• Resistive material: Wirewound (thermal and frequency characteristics)
• Mounting type: Panel Mount (mechanical installation method)
• Built-in switch: None (no integrated switching function)

The RUS300E from Ohmite meets all critical substitution criteria. While the RUS300E provides enhanced power rating (1000W versus 500W), increased rotation angle (335° versus 300°), and different physical dimensions and termination style, these parameters represent functional improvements or design variations that do not prevent substitution in applications originally specified for the RT500AS3000KB.

Parameter Comparison

Engineering Selection Recommendations

The RUS300E is the designated manufacturer-recommended substitute for the RT500AS3000KB. Selection of this substitute is supported by the following factors:

The RT500AS3000KB is classified as obsolete, eliminating the possibility of continued procurement from the original manufacturer. The RUS300E maintains active product status, ensuring availability and ongoing manufacturer support.

The RUS300E carries ROHS3 compliance certification, meeting current environmental and regulatory requirements for electronic component manufacturing and use in regulated industries.

All critical electrical and functional parameters match the original specification: 300 Ohm resistance, ±10% tolerance, linear taper, 1-turn single-gang configuration, and wirewound construction. The enhanced power rating of 1000W provides operational margin beyond the original 500W specification.

Termination style and actuator geometry differ between the two components. Integration into existing circuit designs requires verification that solder lug termination and flatted actuator geometry are compatible with the mechanical and electrical interfaces of the target application.

Frequently Asked Questions (FAQ)

Q: Can the RUS300E directly replace the RT500AS3000KB in all applications?

A: The RUS300E matches all critical electrical and functional parameters required for substitution. However, physical integration must be verified. The RUS300E features solder lug termination instead of solder turret, and a flatted actuator instead of round. PCB layout and mechanical mounting must accommodate these differences.

Q: What is the significance of the power rating difference (500W to 1000W)?

A: The RUS300E provides double the power dissipation capability. This represents a functional enhancement that does not prevent substitution. Applications originally designed for 500W operation will function within the RUS300E's specifications. Thermal management and circuit design remain unchanged.

Q: Are there differences in mechanical dimensions that affect panel mounting?

A: The RT500AS3000KB body diameter is 5.630 inches (143.00mm). The RUS300E body diameter is 12.000 inches (304.80mm). Panel cutout dimensions and mounting hardware must be verified for compatibility with the larger RUS300E form factor.

Q: What is the impact of the rotation angle difference (300° to 335°)?

A: The RUS300E provides 35° additional rotation range. This represents increased adjustment resolution and does not prevent substitution. Applications using the full 300° range of the original component will operate within the RUS300E's 335° specification.

Q: Does ROHS3 compliance affect substitution decisions?

A: ROHS3 compliance of the RUS300E ensures conformance to current environmental regulations. This certification supports use in applications subject to regulatory requirements and does not create incompatibility with the original specification.

Q: What termination considerations apply to the solder lug versus solder turret difference?

A: Solder turret termination (RT500AS3000KB) uses vertical wire leads for PCB insertion. Solder lug termination (RUS300E) uses flat lugs for wire or PCB pad connection. Circuit board layout and connection methodology must be adapted to accommodate solder lug termination.