Product Overview
Danotherm HSD-40-A-20R Aluminum Housed Wirewound Power Resistor, Marked 20R
Condition
Used, clean, and in good condition. The photographs show an extruded aluminum housing with a finned face on one side, a flat plate face on the other, and two integral mounting flanges carrying four through holes. The resistive element sits under an orange coating along the center channel, and two flat spade terminals stand up from that channel. One unit is stamped DANOTHERM F2 107417 on one flange edge and HSD 40 A 20R WO on the other. The second unit in stock carries the same HSD 40A 20R designation in a slightly different marking style, with a legible +- 10 % tolerance and a different serial group. Both show light handling marks and faint scuffing on the bare aluminum, along with minor tool marks around two of the mounting holes. Both also show the factory coating running past the element channel and over the finned end face as a darker red-brown overflow, with a small bare aluminum void in that overflow on one unit, and we cannot tell from photographs whether that darker shade is original or the result of service heat. The orange coating over the element channel itself is unbroken, and no scorching or burn marks are visible on the aluminum. Terminals are bright and straight. Against the millimeter ruler the housing measures approximately 42 mm long by 27 mm across the mounting flanges. Not tested here, so resistance and insulation are unverified.
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Product Overview
This is a Danotherm HSD series aluminum housed wirewound power resistor marked HSD 40 A 20R, the standard notation for 20 ohms, with a +- 10 % tolerance legible on one of the two units in stock. Danotherm is a Danish maker of power resistors used in drive, braking, and industrial control work, and the HSD form factor is the familiar one: the wirewound element is encapsulated in the center channel of an extruded aluminum body so the housing itself carries heat away into whatever plate or chassis you bolt it to. Connection is by two flat spade tabs rather than wire leads, so the resistor drops into an existing harness with quick-connect terminals and comes back out the same way. Mounting is four holes through two flanges that run the full length of the body. The power rating is not printed on the housing in any legible spot in these photos, so treat the wattage as unconfirmed and check it against the Danotherm HSD datasheet before you design it into a load. There are 2 in stock, and the photographs are of the actual units.
Key Features
- Resistance: marked 20R on the housing, the standard notation for 20 ohms
- Tolerance: +- 10 %, legible on one of the two units in stock
- Construction: wirewound element encapsulated under an orange coating in an extruded aluminum body
- Housing: finned on one face, flat plate on the other, for chassis or plate mounting
- Terminals: two flat spade tabs, no wire leads
- Mounting: four through holes in two full length integral flanges
- Housing markings observed: DANOTHERM F2 107417 and HSD 40 A 20R WO on one unit, HSD 40A 20R +- 10 % on the other
- Size against the ruler: approximately 42 mm long by 27 mm across the flanges
- Power rating: not confirmed, verify against the Danotherm HSD datasheet before use
- Condition: Used, untested, 2 in stock
Applications
- Maintenance technician replacing a failed chassis mounted load resistor in an older industrial drive cabinet and matching the original 20 ohm value
- Motor control specialist building a bench setup that needs a 20 ohm element bolted to a heat spreading plate instead of hanging in free air
- Power supply builder who needs a bleeder or inrush limiting element with spade terminals that lands on an existing quick-connect harness
- Restorer of European industrial equipment matching a Danotherm HSD footprint and its four hole flange pattern exactly
Frequently Asked Questions
What exactly is printed on the housing?
One unit reads DANOTHERM F2 107417 along one flange and HSD 40 A 20R WO along the other. The second unit reads HSD 40A 20R +- 10 % in a slightly different marking style with a different serial group. Both are photographed so you can read them yourself before ordering.
Is the 20 ohm value confirmed?
The 20R on the housing is the manufacturer marking, and 20R is the standard notation for 20 ohms. We have not put a meter on these, so treat the value as the marking says and verify on arrival if the number matters to your circuit.
What is the power rating?
Not confirmed. No legible wattage appears on either housing in these photographs, and we will not guess at it. Check the value against the Danotherm HSD datasheet before you size a load around it.
How does it mount and connect?
Four through holes in two aluminum flanges that run the length of the body, so it bolts flat to a plate or chassis that can take the heat. Electrical connection is two flat spade tabs standing up from the center channel, so it takes standard quick-connect terminals rather than soldered leads.
This one is used and untested, so what am I actually taking on?
You are getting a pulled, individually photographed Danotherm HSD-40-A-20R exactly as the pictures show it: sound aluminum housing, unbroken coating over the element channel with the factory coating overflowing onto the finned end face on both units, bright straight spade tabs, and no scorching or burn marks visible on the aluminum. What you are absorbing is the electrical unknown, because we have not metered the resistance or the insulation, and the wattage is not legible on the housing. The photos are the spec, so buy it as a known physical object at a used price rather than as a tested part. Shipping is $8 flat rate and free once your order passes $28, and orders leave the Idaho warehouse the same or next business day.
Danotherm has spent decades building resistors whose entire job is turning surplus watts into warm aluminum and asking nothing else of the design. Bolt this one down, land two spade connectors, and it goes right back to that quiet work.
