Universal Remote Control MX-880Z - SPECS SHEET Informations techniques télécharger pdf (Page 41)

™

Masterpact™ NT and NW Universal Power Circuit Breakers

Accessories

05/2014

Additional Shunt Trip (MX2) or Undervoltage Trip (MN)

This function opens the circuit breaker via an electrical order.

It is made up of:

•

Shunt trip (MX2, second MX) or,

•

Undervoltage trip (MN)

— Instantaneous trip

— Fixed undervoltage trip (time delayed) or,

— Adjustable undervoltage trip (time delayed)

As shown in the wiring diagram for the remote tripping function below, 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.

Second Shunt Trip (MX2)

Table 35: Undervoltage Trip Characteristics

Characteristics MN

Voltage Ratings (V

)

Vac

50/60 Hz

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 V

NW 90 ms ±10

NT 40 ms ±10

Figure 10: Wire Diagram for the Remote Tripping Function

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 179 180

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Universal Remote Control MX-880Z - SPECS SHEET Informations techniques Page 41

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