Wiring Diagrams
Wiring Diagrams for MasterPact NW Circuit Breakers
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 Push-In Type Terminals
Markings for Ring Terminals
|
Auxiliary Contacts |
Cell Switches * |
Markings for Push-In Type Terminals
Markings for Ring 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 Push-In Type Terminals
| Auxiliary Switches |
Cell Switches |
Markings for Push-In Type Terminals
Spring-Charging Motor
Spring-Charging Motor 440/480 Vac (380 Vac Motor + Additional Resistor
Additional Wiring Information for MasterPact NW NT 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 | External Neutral VN Plug | |||
| X | X | UC4 | External Phase Voltage Sensing | ||
| X | X | M2C or M6C | Two Programmable Contacts (internal relay) | ||
| X | X | Six Programmable Contacts (for connection to external M6C module) | |||
| Remote Operation | |
|---|---|
| SDE2 or RES | Electrical Fault Alarm Contact |
| Remote Reset | |
| SDE1 | Electrical Fault Alarm Contact (standard) |
| MN or MX2 | Undervoltage Trip Device |
| 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.
Wiring of the COM varies with available options. See Wiring Diagrams for the COM 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).
(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.
See Connection of the Communications Option.
Wiring of the COM Option (Modbus BCM ULP and CCM Modules