ABB PST Series Installation And Commissioning Manual page 41

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An external by-pass contactor can be used for softstarters
size PST30...300 (built in for size PSTB370...1050).
Connect the contactor to terminals B1, B2 and B3 on the
line side and terminals 2T1, 4T2 and 6T3 on the motor
side.
The terminal marking is printed on the front label.
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41