System information
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Masterpact™ NT and NW Universal Power Circuit Breakers
Accessories
38
05/2014
Options for Remote Operation
Two options are available for remote operation of Masterpact™ circuit breakers: direct connection or a
communication network.
NOTE: When remote operation features are used, a minimum of four seconds is required for the spring
charging motor (MCH) to completely charge the circuit breaker closing springs prior to actuating the
shunt close (XF) device.
The wiring diagrams for these two options are shown below.
Remote Operation Accessories
The remote ON/OFF function is used to remotely open and close the circuit breaker. It is made up of
the following components:
•
A spring-charging motor (MCH) equipped with a spring-charged limit switch; see page 39 for more
information.
•
A shunt close (XF); see page 40 for more information.
•
A shunt trip (MX1); see page 40 for more information.
Optionally, the function may be completed with:
•
A ready-to-close contact (PF).
•
An electrical closing push button (BPFE).
•
A remote reset following a fault (RES).
The remote operation function may be completed with:
•
Auxiliary contacts (OF).
•
Overcurrent trip switch (SDE).
Figure 8: Wiring Diagram for Remote ON/OFF Function by Direct Connection
Masterpact Circuit Breaker Equipped
for Remote ON/OFF Function
Cluster shield is not shown
Figure 9: Wiring Diagram for Remote ON/OFF Function by Communication Network
NOTE: Induced voltages in the circuit at terminal
C2 and/or A2 can cause the shunt close to not work
properly. The best way to prevent induced voltages
is keep the circuit to terminal C2 and A2 as short as
possible. If it is impossible to keep the circuit less
than 10 feet (3 m), use an interposing relay near
terminal C2 or A2.
NOTE: When communicating MX1 or XF coils are
used, terminal (C3 or A3) must be connected to line
even if the communication module is not installed.
The bypass circuit through terminal C2/A2 is only
momentary duty for 0.5 sec. For continuous duty,
use the communications command.