Wiring Diagrams

Wiring Diagrams for MasterPact NW Circuit Breakers

NOTE: All diagrams show circuit breaker open, connected and charged.

A	Do not remove factory-installed jumpers between Z3, Z4 and Z5 unless ZSI is connected.
B	Do not remove factory-installed jumper between T1 and T2 unless neutral CT is connected. Do not install jumper between T3 and T4.
C	For proper wiring of neutral CT, refer to Instruction Bulletin 48041-082-01 shipped with it.
D	24 Vdc power supply for trip unit must be separate and isolated from 24 Vdc power supply for communication modules.
E	When remote operation features are used, make sure there is a minimum of four seconds for the spring charging motor (MCH) to completely charge the circuit breaker closing springs prior to actuating the shunt close (XF) device.

Markings for Terminals

Auxiliary Contacts

Cell Switches

Markings for Push-In Type Terminals

Wiring Diagrams for MasterPact NT Circuit Breakers

Markings for Push-In Type Terminals

NOTE: All diagrams show circuit breaker open, connected and charged.

A	Do not remove factory-installed jumpers between Z3, Z4 and Z5 unless ZSI is connected.
B	Do not remove factory-installed jumper between T1 and T2 unless neutral CT is connected. Do not install jumper between T3 and T4.
C	For proper wiring of neutral CT, refer to Instrucion Bulletin 48041-082-01 shipped with it.
D	24 Vdc power supply for trip unit must be separate and isolated from 24 Vdc power supply for communication modules.
E	When remote operation features are used, make sure there is a minimum of four seconds for the spring charging motor (MCH) to completely charge the circuit breaker closing springs prior to actuating the shunt close (XF) device.

Markings for Terminals

Auxiliary Switches

Cell Switches

Markings for Terminals

Spring-Charging Motor 440/480 Vac (380 Vac Motor + Additional Resistor

Additional Wiring Information for MasterPact NWNT Circuit Breakers

Alarm Contacts (OF1, OF2, OF3 and OF4 are standard equipment)
OF4 OF3 OF2 OF1	Open/Closed Circuit Breaker or Switch Position Contacts	OF24: Open/Closed Circuit Breaker or Switch Position Contact or EF24: Combined Connected and Closed Contact
		OF23 or EF23
		OF22 or EF22
		OF21 or EF21
		OF14 or EF14
		OF13 or EF13
		OF12 or EF12
		OF22 or EF22
		OF11 or EF11

Cradle Contacts
CD3 CD2 CD1	Disconnected Position Contacts	CE3 CE2 CE1	Connected Position Contacts	CT3 CT2 CT1	Test Position Contacts
or				or
CE6 CE5 CE4	Connected Position Contacts			CE9 CE8 CE7	Connected Position Contacts
				or
				CD6 CD5 CD4	Disconnected Position Contacts

Trip Unit
Basic	A	P	H
	X	X	X	Com:	E1–E6 Communication
	X	X	X	UC1:	Z1–Z5 Logical Selectivity
	X	X	X		Z1 = ZSI OUT
	X	X	X		Z2 = ZSI OUT Source; Z3 = ZSI IN Source
	X	X	X		Z4 = ZSI IN Short-Time Delay
	X	X	X		Z5 = ZSI IN Ground Fault
	X	X	X	UC3:	F2+, F1– 24 Vdc External Power Supply
	X	X	X	UC3:	External Neutral VN Plug
		X	X	UC4	External Phase Voltage Sensing
		X	X	M2C or M6C	Two Programmable Contacts (internal relay)
		X	X	M2C or M6C	Six Programmable Contacts (for connection to external M6C module)

Remote Operation
SDE2 or RES	Electrical Fault Alarm Contact
SDE2 or RES	Remote Reset
SDE1	Electrical Fault Alarm Contact (standard)
MN or MX2	Undervoltage Trip Device
MN or MX2	Additional Shunt Trip
MX1	Shunt Trip (standard or networked)
XF	Shunt Close (standard or networked)
PF	Ready-to-Close Contact
MCH	Spring-Charging Motor

NOTE: When communication version of the MX1 or XF coils are used, terminals (C3, A3) must be connected to line even if the communications 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.

Connection of the Communications Option

A	24 Vdc power supply for trip unit must be separate and isolated from 24 Vdc power supply for communication modules.
B	Refer to instructions bulletin 48041-082 included with neutral CT for proper wiring.

NOTE: Fixed-mounted circuit breaker does not have cell switches
(CE, CD, CT).

NOTE: A recommended wiring schematic for the communicating style shunt trip or shunt close coils is shown below.

Induced voltages in the circuit at terminal C2 and/or A2 can cause the shunt trip or shunt close to not work properly. The best way to prevent the 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.

Wiring Diagrams for the COM Option

Wiring of the I/O Modules

See Connection of the Communications Option for more information.

Wiring of the COM Option (Modbus BCM ULP and CCM Modules

See Connection of the Communications Option for more information.