Mdu Breaker Installation Instructions; Mdu Mounting (External Mounting For 250 A Frame); Check The Wiring Of The Connection Cable; Mounting Of Mdu Mounting Plate (Figure 2 And 3) - Mitsubishi Electric MDU-BN Instruction Manual

3. MDU Breaker Installation Instructions

●
When mounting or removing the MDU, first turn the host circuit breaker OFF and confirm that no electricity is flowing.
●
First set the MDU Breaker main unit to OFF or TRIP, and then mount the MDU and connection cable.

3.1 MDU Mounting (external mounting for 250 A frame)

3.1.1 Check the wiring of the connection cable

(1) Check that the connection cable is drawn out through the cable outlet port of the MDU Breaker without catching. (Figure 1)

3.1.2 Mounting of MDU mounting plate (Figure 2 and 3)

(1) Before mounting of MDU mounting plate, connect the terminals on the load side of the breaker.
(2) While pressing the MDU mounting plate to the pressing area of the MDU Breaker main unit, screw the MDU mounting plate into the MDU
Breaker main unit.
Use the included " 3 × 10 " screws.
(3) Ground (class D) the FG terminal.
FG terminal screw
M4 × 6
(tightening torque:
1.4 to 1.8 N·m)
Fixing screws for
MDU mounting
plate 3 × 10
(tightening torque:
1.0 to 1.1 N·m)
MDU mounting plate
(Figure 1)
Pressing area
Fitting (one place)
Connection cable
Guide area
(Figure 2)
Caution
Cable outlet port
FG terminal screw
M4 × 6
(tightening torque:
1.4 to 1.8 N·m)
Fixing screws for
MDU mounting
plate 3 × 10
(tightening torque:
1.0 to 1.1 N·m)
MDU mounting plate
7
Pressing area
Fitting
(one place)
Connection
cable
Guide area
(Figure 3)