These main contact sets are electrical replacement contacts or repair kits for Mitsubishi S-K series motor starter and contactors.They are packaged at 3poles(3 movable kits and 6 stationary kits plus spring clips and screws.
Here is the part number list of replacement contact kits&repair kits for Mitsubishi S-K series contactor:
BH529N301 used for Size 0, 3 Pole, S-K18&19
BH539N300 used for Size 0.75, 3 Pole, S-K21
BH549N300 used for Size 1, 3 Pole, S-K25
BH559N306 used for Size 1.5, 3 Pole, S-K35
BH559N300 used for Size 2, 3 Pole, S-K50
BH559N301 used for Size 2.5, 3 Pole, S-K65
BH569N300 used for Size 2.75, 3 Pole, S-K80
BH569N301 used for Size 3, 3 Pole, S-K95
BH579N301 used for Size 3.5, 3 Pole, S-K125
BH589N300 used for Size 4, 3 Pole, S-K150
BH599N301 used for Size 4.5, 3 Pole, S-K180
BH599N300 used for Size 4.5, 3 Pole, S-K220
BH609N300 used for Size 5, 3 Pole, S-K300
BH609N301 used for Size 5.5, 3 Pole, S-K400
BH619N300 used for Size 6, 3 Pole, S-K600
BH619N301 used for Size 7, 3 Pole, S-K800
