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#35358 - 06/17/03 02:22 PM Re: Air conditioner unloader. Carpal Tunnel Registered: 07/03/01 Posts: 6122. An unloader ordinarily lifts a valve open so the full capacity of a multi-cylinder compressor is not used.This can make the equivalent of a multi-speed compressor, which would accomplish the same effect of handling more or less cooling as needed.One unloader would do less reduction capacity than two. You would want to know how much reduction you need and what you are using it for.his can make the equivalent of a multi-speed compressor, which would accomplish the same effect of handling more or less cooling as needed. One unloader would do less reduction capacity than two. You would want to know how much reduction you need and what you are using it for.
Overload means an excess current drawn, which will lead to tripping of the circuit breaker once the current exceeds 5 times the rated MCB current value within a tenth of a second (depending on the Type of MCB). When your electric load is faulty and there's a short circuit, a lot of current is drawn -> MCB trips. But an electric shock to a human being may not always draw an excessive current that is so high to trip the MCB and protect you. This is where RCCB comes in.