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:
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A spring-charging motor (MCH) equipped with a spring-charged limit switch; see Spring-Charging Motor (MCH) for more information.
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A shunt close (XF); see Shunt Trip (MX1) and Shunt Close (XF) for more information.
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A shunt trip (MX1); see Shunt Trip (MX1) and Shunt Close (XF) for more information
Optionally, the function may be completed with:
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A ready-to-close contact (PF).
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An electrical closing push button (BPFE).
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A remote reset following a fault (RES).
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The remote operation function may be completed with:
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Auxiliary contacts (OF).
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Overcurrent trip switch (SDE).
Wiring Diagram for Remote ON/OFF Function by Communication Network
Terminals
Terminal Characteristics
Standards | UL 486E | |
Termination Capacity | 22–14 AWG solid or stranded wire with max. O.D. of insulation 3.5 mm | |
Current | Nominal | 10:00 AM |
Minimum | 100mA at 24 V | |
Pull-Out Forces | 22 AWG = 4.5 lbs. (20 N) | |
20 AWG = 6.75 lbs. (30 N) | ||
18 AWG = 6.75 lbs. (30 N) | ||
16 AWG = 9 lbs. (40 N) | ||
14 AWG = 11.5 lbs. (50 N) |
Spring-Charging Motor (MCH)
The spring-charging motor automatically charges the spring mechanism for closing the circuit breaker and also recharges the spring mechanism when the circuit breaker is in the ON position. Instantaneous reclosing of the circuit breaker is thus possible following circuit breaker opening. The spring-mechanism charging handle is used only as a backup if auxiliary power is absent.
The spring-charging motor is equipped as standard with a limit switch contact (CH) that signals the charged positio
Spring-Charging Motor Characteristics
Characteristics |
MCH |
|
Voltage Ratings (Vn) |
Vac 50/60 Hz |
48/60, 100/130, 200/250, 240/277, 380/415, 400/440, 480 |
Vdc |
24/30, 48/60, 100/125, 200/250 |
|
Operating Threshold |
0.85 to 1.1 Vn |
|
Power Consumption |
180 VA |
|
Motor Overcurrent |
2–3 x In for 0.1 s |
|
Charging Time |
4 s maximum on NW, 3 s maximum on NT |
|
Duty Cycle |
3 cycles per minute maximum |
|
Endurance |
10,000 cycles for NW < 4000 A |
|
5000 cycles for NW ³ 4000 A |
||
CH Contact |
10 A at 240 V |
Shunt Trip (MX1) and Shunt Close (XF)
Maximum Wire Length—The inrush currents for these devices are approximately 200 VA. When low supply voltages (12, 24 or 48 V) are used, the maximum allowable wire length is dependent on the voltage and the wire size.
Device |
Percent of Source Voltage |
Source Voltage |
|||||
12 Vdc |
24 Vdc |
48 Vdc |
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Wire Size |
14 AWG |
16 AWG |
14 AWG |
16 AWG |
14 AWG |
16 AWG |
|
UVR (MN) |
100% |
— |
— |
159 ft. |
100 ft. |
765 ft. |
472 ft. |
85% |
— |
— |
44 ft. |
29 ft. |
205 ft. |
129 ft. |
|
Shunt Trip (MX) and Shunt Close (XF) |
100% |
57 ft. |
34 ft. |
314 ft. |
200 ft. |
1503 ft. |
944 ft. |
85% |
27 ft. |
17 ft. |
205 ft. |
126 ft. |
957 ft. |
601 ft. |
Shunt Trip (MX1): When energized, the shunt trip instantaneously opens the circuit breaker. The shunt trip may be energized continuously or intermittently.
Shunt Close (XF): Remotely closes the circuit breaker if the spring mechanism is charged.
Do not use a standing close order on the shunt close coil (XF). Any opening order will open the circuit breaker so a standing close order is not necessary. See Features and Benefits.
Communication versions of the MX1 and XF are available for direct connection via the circuit breaker communication module (BCM ULP).
Shunt Trip and Shunt Close Characteristics
Characteristics |
MX1 and MX2 |
XF |
Min |
Max |
|
---|---|---|---|---|---|
Voltage Ratings (Vn) |
Vac |
24 Vac |
17 Vac |
26 Vac |
|
48 Vac |
34 Vac |
52 Vac |
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120 Vac |
60 Vac |
132 Vac |
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240 Vac |
168 Vac |
264 Vac |
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277 Vac |
194 Vac |
304 Vac |
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380 Vac |
266 Vac |
418 Vac |
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480 Vac |
336 Vac |
528 Vac |
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Vdc |
12 Vdc |
8 Vdc |
13 Vdc |
||
24 Vdc |
17 Vdc |
26 Vdc |
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48 Vdc |
34 Vdc |
52 Vdc |
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125 Vdc |
88 Vdc |
137 Vdc |
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250 Vdc |
175 Vdc |
275 Vdc |
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Operating Threshold |
0.7 to 1.1 Vn |
0.85 to 1.1 Vn |
|||
Power Consumption (VA or W) |
Steady-State/Inrush |
4.5/200 |
|||
Circuit Breaker Response Time at Vn* |
50 ms ±10 |
70 ms ±10 (NW ≤ 4000 A) |
Additional Shunt Trip (MX2) or Undervoltage Trip (MN)
This function opens the circuit breaker via an electrical order.
It is made up of:
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Shunt trip (MX2, second MX) or,
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Undervoltage trip (MN)
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Instantaneous trip
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Fixed undervoltage trip (time delayed) or,
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Adjustable undervoltage trip (time delayed)
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As shown in the wiring diagram for the remote tripping function, the delay unit (installed outside the circuit breaker) may be disabled by an emergency off button to obtain non-delayed opening of the circuit breaker.
When energized, the shunt trip (MX1 or MX2) instantaneously opens the circuit breaker.
The undervoltage trip (MN) instantaneously opens the circuit breaker when its supply voltage drops to a value between 35% and 70% of its rated voltage.
If the undervoltage trip is not energized, it is impossible to close the circuit breaker, either manually or electrically. An attempt to close the circuit breaker produces no movement of the main contacts. Closing is allowed when the supply voltage of the undervoltage trip reaches 85% of rated voltage.
Characteristics |
MN |
|
---|---|---|
Voltage Ratings (Vn) |
Vac |
24 Vac |
48 Vac |
||
120 Vac |
||
240 Vac |
||
277 Vac |
||
380 Vac |
||
480 Vac |
||
Vdc |
12 Vdc |
|
24 Vdc |
||
48 Vdc |
||
125 Vdc |
||
250 Vdc |
||
Power Consumption (VA or W) |
Constant/Inrush |
4.5/200 |
Operating Threshold |
Opening |
0.35 to 0.70 Vn |
Closing |
0.85 Vn |
|
Circuit Breaker Response Time at Vn |
NW |
90 ms ±10 |
NT |
40 ms ±10 |
Time-Delay Module for Undervoltage Trip
To eliminate circuit breaker nuisance tripping during temporary voltage dips (micro-breaks), operation of the undervoltage trip (MN) can be delayed. This function is achieved by adding an external delay unit (either adjustable or non-adjust
Time-Delay Module Characteristics
Voltage Ratings of Undervoltage Trip |
Vac 50/60 Hz |
24/30, 48/60, 100/130, 200/250, 380/480 |
|
Vdc |
24/30, 48/60, 100/130, 200/250 |
||
Voltage Ratings of Time-Delay Module |
Adjustable |
Vac 50/60 Hz |
48/60, 100/130, 200/250, 380/480 |
Vdc |
48/60, 100/130, 200/250, 380/480 |
||
Non-Adjustable |
Vac 50/60 Hz |
100/130, 200/250 |
|
Vdc |
100/130, 200/250 |
||
Operating Threshold |
Opening |
0.35 to 0.7 Vn |
|
Closing |
0.85 Vn |
||
Power Consumption |
4.5 VA/W (Holding), 200 VA/W (Inrush) |
||
Time-Delay Settings |
Adjustable |
0.5, 0.9, 1.5, and 3.0 s |
Ready-to-Close Switch (PF)
The ready-to-close position switch indicates that the following conditions are met and the circuit breaker can be closed:
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The circuit breaker is open.
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The closing springs are charged.
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There is no standing closing or opening order.
Ready-to-Close Switch Characteristics
Type of Contact |
1a/1b Form C |
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Maximum Number of Contacts |
1 |
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Breaking Capacity at a |
Standard: 100 mA/24V minimum load |
Low-Level: 2 mA/15 V minimum load |
||
240/380 Vac |
5:00 AM |
24/48 Vac |
3:00 AM |
|
480 Vac |
5:00 AM |
240 Vac |
3:00 AM |
|
600/690 Vac |
3:00 AM |
380 Vac |
3:00 AM |
|
24/48 Vdc |
3:00 AM |
24/48 Vdc |
3:00 AM |
|
240 Vdc |
0.3 A |
125 Vdc |
0.3 A |
|
380 Vdc |
0.15 A |
250 Vdc |
0.15 A |
Electrical Closing Push Button (BPFE)
Located on the front panel of the circuit breaker, this push button carries out electrical closing of the circuit breaker, taking into account all of the safety functions that are part of the control/monitoring system of the installation. The push button is installed on the control circuit of the shunt close, and connects to the communicating shunt close module (XF-COM). Terminal A2 of XF-COM is used to remotely close the circuit breaker.
Remote Reset (RES) and Automatic Reset After Fault
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Remote reset (RES): following tripping, the remote reset (RES) resets the overcurrent trip switch (SDE) and the mechanical indicator. (Voltage rating: 110/130 Vac and 200/240 Vac.) RES is not compatible with an additional overcurrent trip switch (SDE2).
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Automatic reset after fault-trip: following tripping, a reset of the mechanical indicator (reset button) is no longer required to enable circuit breaker closing (factory adjustable only).