HSD / HSF are wirewound resistors on mica elements, fitted into a heatsink filled with a silicone rubber which is UL recognized up to a working temperature of 220°C. They are ideally suited as balancing resistors. HSD types have its terminals upwards (vertical) to the heatsink. HSF have its terminals parallel to the heatsink. Its nominal power depends on the heatsink temperature it is mounted on.
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