Product Overview
Dale RH-25 Power Resistor: 100 Ohms, 25 Watts, 1% Precision in an Aluminum Shell
Condition
Unused, New Old Stock. The gold anodized aluminum housing is stamped DALE RH-25, 100 ohm 1 percent, 25W with date code 7608, and the print is crisp and fully legible. The finned sides show only minor surface scuffs with no corrosion. Terminals are flat tinned solder lugs with eyelet holes, straight and true, and both offset mounting flanges are clean with open screw holes. Against the PartsMine ruler the housing measures approximately 28 mm long, not counting the lugs.
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Product Overview
The Dale RH-25 is a chassis-mount wirewound power resistor rated 100 ohms at 25 watts with a tight 1 percent tolerance, and the value, tolerance, and wattage are all stamped right on the housing in the photos. Its gold anodized aluminum shell is built to move heat into a mounting surface: bolt it flat through the two diagonally offset flanges to a heatsink or metal chassis and it delivers its full 25 watt rating. Connections are made at the flat tinned solder lug terminals with eyelet holes on each end. Part of the Vishay Dale RH precision power line, its wirewound construction keeps the resistance value stable and predictable under load, which is why these show up in power supplies, industrial controls, and test equipment.
Key Features
- Manufacturer: Dale (Vishay Dale RH series)
- Series: RH-25
- Resistance: 100 ohms
- Power rating: 25 watts with proper heatsinking
- Tolerance: 1 percent
- Construction: wirewound element
- Housing: gold anodized aluminum with finned sides, chassis mount
- Mounting: two diagonally offset flanges with screw holes
- Terminals: flat tinned solder lugs with eyelet holes
- Housing length: approximately 28 mm against the ruler, lugs excluded
Applications
- Power supply designer specifying a bleeder or load resistor that holds its value under heat
- Test bench engineer building a 25 watt dummy load for supply and amplifier testing
- Industrial maintenance tech replacing a chassis-mount resistor in a motor control cabinet
- Audio builder who wants a power stage resistor that stays stable under load
Frequently Asked Questions
Is the 25 watt rating valid without a heatsink?
The 25 watt rating applies when the resistor is properly mounted to a suitable heatsink or metal chassis. Free-air dissipation is lower.
What is the tolerance?
This unit is stamped 1 percent on the housing, meaning the resistance is within 1 percent of 100 ohms.
How do I connect to it?
Each end has a flat tinned solder lug with an eyelet hole, so you can solder directly or use a small screw or wire loop through the eyelet.
Can I use it as a load resistor?
Yes. A 100 ohm, 25 watt wirewound resistor is a common choice for load and bleeder duty in power supply testing and design, as long as power limits are respected.
How many do you have?
2 in stock as of this listing.
Why buy one or two pieces here instead of a bulk lot on eBay or Amazon?
Most repairs and dummy load builds need exactly one or two, and that is exactly what we sell - no forced lot of ten. Shipping is $8 flat rate and free over $28, so a couple of these usually lands well under a bulk listing's total, shipped same or next business day from Idaho.
Wirewound at 1 percent is a quiet promise: the number on the label is the number in the circuit. Bolt it to metal, give it heat to move, and it will do steady work for years without asking for attention.
