KRB-5404
10
Do not install the ACB in such an area that is exposed to direct sunlight.
Make sure that the mounting base has a sufficient capacity of bearing the weight of the ACB (see Table 3 and Table 4). The
mounting base must be protected against vibration. Take appropriate measures to provide a perfect protection to the mounting
base against resonance. Otherwise, open/close operation of the ACB may cause a malfunction of other devices in the switchboard
or vibrations of the switchboard may cause a malfunction of the ACB.
Use the following screws with appropriate length for the main circuit terminals.
Main circuit terminal screws: Hex head M10, with flat washers (2), spring washer (1) and nut (1) per screw
Tightening torque: 22.5 - 37.2 N·m
Table 1 Number of main circuit terminal screws required
ACB type
AR208S, AR212S, AR216S
AR208D, AR212D, AR216D
AR220S,
AR212H, AR216H, AR220H
AR325S, AR332S
AR316H, AR320H, AR325H, AR332H
AR440SB
AR440S,
AR420H,
AR440H
Number of main
circuit terminal
screws
(3/4-pole)
Vertical terminals
12/16
18/24
24/32
24/32
48/64
Horizontal/front terminals*
12/16
18/24
-
-
* Front terminals are not applicable for high-performance ARxxxH types.
Use the following screw for the ground terminal. The screw must have a length that allows it to be inserted 4 - 9 mm into the
ground terminal M8 tapped hole.
Ground terminal screw: M8 (1) with spring washer and flat washer
Tightening torque: 11.8 - 14.7 N·m
