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ABB MD21 - Interfaces and Terminal Blocks Overview

ABB MD21
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03 . INSTALLATION AND WIRING 11
Digital inputs for various
functions
Digital inputs for various
functions
CT inputs
(lead-through)
CT inputs
(lead-through)
Thermistor
input
Thermistor
input
Interface for MDx
Interface for MDx
Communication ports
Communication ports
RCT inputs
RCT inputs
Relay output
Relay output
Ground safety
and surge
Ground safety
and surge
Voltage input
Voltage input
Power supply
Power supply
1 2 3 4 5 6 7 8 9 10 11 1
1 2 3 4 5 6 7 8 9 10 11 1
2
2
1 2 3 4 5 6 7 8 9 10 11 12 1
1 2 3 4 5 6 7 8 9 10 11 12 1
3
3
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1
6
6
X2
X2
X1
X1
X3
X3
X4
X4
L
L
T
T
Interfaces
Terminal blocks of M10x are located on the top of
the main unit for easy access. There are 3 sets of
I/O terminal blocks and 1 set of RJ11 connectors
as shown.
03 Top view terminal layout (24VDC)
04 Top view terminal layout (110VAC or 240VAC)

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