GE Industrial Solutions MicroVersaTrip Plus and MicroVersaTrip PM for Allis Chalmers, Siemens_Allis, and Siemens LA-600[F] and LA-1600[F] (Blue) - Manual (Page 10)

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4. Slide the adapter bracket and connector assembly over the
guide pins of the trip unit bracket. Press the two steel push
nuts provided onto the guide pins using a nut driver, as
shown in Figure 14, until the assembly is held firmly against
the trip unit mounting plate.
5. While holding the adapter bracket and connector assembly
firmly in place against the mounting plate, bend the two
locking tabs on the mounting plate into the mating notches
on the adapter bracket using a screwdriver, as shown in
Figure 15.
Figure 14. Installing the push nuts onto the guide pins.
Figure 15. Locking tabs on mounting plate.