A compressor (10, 200) for compressing refrigerant, having a power unit arranged in a power unit space (14) which is delimited at least partially by a power unit housing (12), having a suction gas volume (46) and having a high-pressure volume (48) is in fluid communication with the power unit space (14) via a second fluid connection (74), wherein the compressor furthermore has a first fluid connection (54, 254) which can be placed in or is in fluid communication with an oil-conducting volume (205) of a refrigeration plant or of the compressor (10, 200), wherein an oil separator (56) is arranged in the first fluid connection (54, 254).