HACR (used with A/C) A resistance type circuit breaker that has characteristics usable with air conditioning system compressor circuits.
Hand-held spirit level A flat bar like tool that has a curved alcohol filled tube mounted in it so that a bubble left in the tube centers between two lines when the bar is placed on a level surface.
Hermetically sealed A component that is sealed from the atmosphere with no shafts or other devices penetrating the membrane that is sealed within
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