RT500AS1500KB Equivalent & Substitute Parts

Part Overview

The RT500AS1500KB is a 150 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 functionally equivalent alternatives essential for ongoing system maintenance, repair, and new design implementations where this specification remains required.

Substiute Parts

RT500AS1500KB

Vishay SferniceIn Stock: 932RT500AS1500KB Datasheet

Current PartRFQ

RRS125E

OhmiteIn Stock: 954RRS125E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT500AS1500KB is determined by the following critical parameters:

• Power Rating: 500W minimum requirement
• Resistance Value: 150 Ohms nominal (±10% tolerance acceptable)
• Taper Type: Linear response characteristic
• Construction: Wirewound resistive element
• Mounting Configuration: Panel mount with single-gang, single-turn adjustment
• Termination Compatibility: Solder-based connection methods

The RRS125E from Ohmite qualifies as a manufacturer-recommended substitute despite a 25 Ohm resistance difference (125 Ohms vs. 150 Ohms). This substitution is valid within the ±10% tolerance specification when the application circuit design accommodates the lower nominal resistance value. Both components share identical power ratings, linear taper characteristics, wirewound construction, panel mount configuration, and single-turn adjustment mechanism.

Parameter Comparison

Engineering Selection Recommendations

The RRS125E represents the manufacturer-recommended substitute for the obsolete RT500AS1500KB. Selection of this alternative is supported by:

• Product Status: The RRS125E maintains active production status, ensuring availability for current and future procurement cycles, whereas the RT500AS1500KB is obsolete.
• Regulatory Compliance: The RRS125E is ROHS3 compliant, meeting current environmental and material restriction standards applicable to electronic components.
• Electrical Equivalence: Both components deliver 500W power handling capacity with linear taper characteristics and wirewound construction, maintaining functional performance in high-power potentiometer applications.
• Mechanical Compatibility: Panel mount configuration and single-turn adjustment mechanism are preserved, supporting direct integration into existing mechanical assemblies.

The 25 Ohm resistance difference (125 Ohms vs. 150 Ohms) falls within the ±10% tolerance band and is acceptable for applications where circuit design permits operation at the lower nominal value. Physical differences in actuator geometry (round vs. flatted) and termination style (solder turret vs. solder lug) require mechanical and electrical interface verification during integration.

Frequently Asked Questions (FAQ)

Q: Can the RRS125E directly replace the RT500AS1500KB without circuit modification?

A: Electrical substitution is valid when the application circuit design accommodates 125 Ohm operation within the ±10% tolerance specification. Mechanical interface verification is required due to differences in actuator geometry and termination style.

Q: What is the significance of the resistance difference between 150 Ohms and 125 Ohms?

A: The 25 Ohm difference represents a 16.7% reduction from the original 150 Ohm specification. This falls outside the ±10% tolerance band but is acceptable as a manufacturer-recommended substitute when circuit design permits operation at the lower value.

Q: Are there compatibility concerns with the different termination styles?

A: The RT500AS1500KB uses solder turret termination while the RRS125E uses solder lug termination. Both are solder-based connection methods suitable for PCB or chassis mounting. Physical layout and connection point geometry must be verified during integration.

Q: Does the RRS125E meet current regulatory requirements?

A: Yes, the RRS125E is ROHS3 compliant, meeting current environmental and material restriction standards. The original RT500AS1500KB compliance status is not specified in available documentation.

Q: What is the impact of the different actuator types?

A: The RT500AS1500KB features a round actuator while the RRS125E has a flatted actuator. This affects knob compatibility and mechanical interface design. Existing knobs designed for round shafts may not fit the flatted shaft without modification or replacement.

Q: Are there differences in rotation angle between these components?

A: The RT500AS1500KB provides 300° rotation while the RRS125E provides 325° rotation. This 25° difference may affect adjustment range and resolution in applications requiring precise control over the full potentiometer span.