
© 2000–2014 Schneider Electric
All Rights Reserved
Masterpact™ NT and NW Universal Power Circuit Breakers
Accessories
40
05/2014
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.
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.
NOTE: Do not use a standing close order on the shunt close coil (XF).
Any opening order will open the breaker so a standing close order is
not necessary. See Anti-Pump Feature on page 5.
Communication versions of the MX1 and XF are available for direct connection via the circuit breaker
communication module (BCM).
Table 33: Maximum Wire Length
1
1
The length shown in the table is for each of the two supply wires.
Device
Percent of
Source Voltage
Source Voltage
12 Vdc 24 Vdc 48 Vdc
Wire Size
14 AWG
(2.08 mm
2
)
16 AWG
(1.31 mm
2
)
14 AWG
(2.08 mm
2
)
16 AWG
(1.31 mm
2
)
14 AWG
(2.08 mm
2
)
16 AWG
(1.31 mm
2
)
UVR (MN)
100% — —
159 ft
(48.5 m)
100 ft
(30.5 m)
765 ft
(233.2 m)
472 ft
(143.9 m)
85% — —
44 ft
(13.4 m)
29 ft
(8.8 m)
205 ft
(62.5 m)
129 ft
(39.3 m)
Shunt Trip (MX) and
Shunt Close (XF)
100%
57 ft
(17.4 m)
34 ft
(10.4 m)
314 ft
(95.7 m)
200 ft
(61.0 m)
1503 ft
(457.8 m)
944 ft
(287.7 m)
85%
27 ft
(8.2 m)
17 ft
(5.2 m)
205 ft
(62.5 m)
126 ft
(38.4 m)
957 ft
(291.7 m)
601 ft
(183.2 m)
Table 34: Shunt Trip and Shunt Close Characteristics
Characteristics MX1 and MX2 XF Min Max
Voltage Ratings (V
n
)
Vac
50/60 Hz
24 Vac 17 Vac 26 Vac
48 Vac 34 Vac 52 Vac
120 Vac 60 Vac 132 Vac
240 Vac 168 Vac 264 Vac
277 Vac 194 Vac 304 Vac
380 Vac 266 Vac 418 Vac
480 Vac 336 Vac 528 Vac
Vdc
12 Vdc 8 Vdc 13 Vdc
24 Vdc 17 Vdc 26 Vdc
48 Vdc 34 Vdc 52 Vdc
125 Vdc 88 Vdc 137 Vdc
250 Vdc 175 Vdc 275 Vdc
Operating Threshold 0.7 to 1.1 V
n
0.85 to 1.1 V
n
Power Consumption (VA or W) Steady-State/Inrush 4.5/200
Circuit Breaker Response Time at V
n
1
1
Shunt trip (MX1) and shunt close (XF) circuits must be energized for minimum of 200 ms.
50 ms ±10
(NW and NT)
70 ms ±10 (NW ≤ 4000 A)
80 ms ±10 (NW > 4000 A)
55 ms (NT)
Shunt Trip (MX1) and
Shunt Close (XF)
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