Instruction manual

KRB-5377

Do not install the ACB in such an area that is exposed to direct sunlight.

z 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.

z 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

AR220S,

AR212H, AR216H, AR220H

AR325S, AR332S

AR316H, AR320H, AR325H, AR332H

AR440SB

AR440S,

AR420H,

AR440H

Vertical terminals 12/16 18/24 24/32 24/32 48/64

Number of main

circuit terminal

screws

(3/4-pole)

Horizontal/front terminals* 12/16 18/24 - -

* Front terminals are not applicable for high-performance ARxxxH types.

z 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