this series start relays are used for refrigeration compressor. there has 1PIN , 2PIN, 3PIN and 4PIN  

Model	Resistance	Max. starting current	Poressure	Reset
MZ-5	5±10%	12A	≥450V	≥60S
MZ-12	12±10%	10A	≥450V	≥60S
MZ-15	15±10%	9A	≥450V	≥60S
MZ-22	22±10%	8A	≥450V	≥60S
MZ-33	33±10%	7A	≥450V	≥60S
MZ-47	47±10%	5A	≥450V	≥60S
MZ-100	100±10%	4A	≥450V	≥60S

start relay