Mitsubishi Electric MR-J2S-CP Instruction Manual page 263

14. OPTIONS AND AUXILIARY EQUIPMENT
For the MR-RB50 MR-RB51 install the cooling fan as shown.
Top
Cooling fan
Bottom
Vertical
installation
Installation surface
Horizontal installation
Cooling fan installation screw hole dimensions
Terminal block
Thermal relay
14 - 6
[Unit : mm(in)]
2-M3 screw hole
(for cooling fan installation)
Depth 10 or less
(Screw hole already
machined)
82.5 40 (1.58)
(3.25)