Could you please specify a tightening torque for 87312 / 87312PR and 87313 / 87313PR terminals connection to copper busbars (VBB)

The tightening torque for bolt connection between 87312/87312PR and 87313/87313PR to the Vertical busbar, is same as the tightening torque for NW/MTZ Masterpact and terminal. It will be written at the back portion of the NW/MTZ masterpact.
See attached image. For 87313 and Vertical busbar generally, the torque value is 16-18 Nm. But, for latest torque values, please refer the back side of the NW/MTZ Masterpact.

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