Overview
The Dale RH-25 500 ohm 25W wirewound power resistor is a precision fixed resistor engineered for demanding industrial, test, and RF applications. Built with a wirewound resistive element and hermetically sealed aluminum housing, this resistor provides excellent thermal dissipation and long-term stability. The 1% tolerance specification ensures accurate, repeatable performance in voltage dropping, load testing, and signal attenuation circuits.
Key Features
- Wirewound construction with precision 1% tolerance for stable, repeatable performance
- Aluminum heat sink housing for superior thermal dissipation and high power density
- Solder terminals (axial lugs) for easy chassis mounting and PCB integration
- High isolation rating and wide operating voltage range (550V nominal)
- Low temperature coefficient (20 PPM/°C) for minimal drift over operating range
Technical Specifications
- Resistance: 500 Ω
- Power Rating: 25 W
- Tolerance: 1%
- Temperature Coefficient: 20 PPM/°C
- Working Voltage: 550 V
- Mounting Style: Chassis mount with solder terminals
- Housing: Aluminum with high-performance heat sink
- Dielectric Strength: 1,000 VRMS
- Stability: <0.05% per year
Typical Applications
- Power supply circuits and voltage dropping
- Test and measurement equipment load banks
- RF and high-frequency signal attenuation
- Audio amplifier biasing and current limiting
- Industrial motor control and switching circuits
- Tube amplifier load and bias networks
Compatibility & Replacements
Compatible With
- Industrial test equipment and burn-in boards
- Audio amplifier platforms (tube and solid-state)
- RF and microwave test benches
- Power supply design (linear and switching topologies)
- Precision current limiting networks
Replaces / Drop-In Replacement For
- Vishay Dale RH-25-500 series (various tolerance grades)
- Generic 500Ω 25W wirewound resistors with 1% tolerance
- Similar aluminum-housed chassis mount resistors from other manufacturers
Works With
- Hand assembly and wave soldering processes
- Manual and automated test circuits
- Breadboard and PCB prototyping
- Industrial equipment retrofit and repair
