Hitachi

  • If the voltage of the main or the control power is under voltage, UVT which is installed inside of the breaker breaks the circuit automatically. Please connect with UVT time-delay device in order to present the timedelay function because UVT is technically instantaneous type.
  • The closing of a circuit breaker is impossible mechanically or electrically if control power not supplied to UVT. To close the circuit breaker, 65–85% of rated voltage should be applied to both terminals of UVT coil (D1, D2).
  • When using UVT coil, the double trip coil can not be used, and the location of trip coil is changed.

1. Rated voltage and characteristics of UVT coil

Rated voltage[Vn] Operating voltage range[V] Power consumotion[VA or W] Trip time[ms]
DC[V] AC[V] Pick up Drop out Inrush Steady-state
24–30 0.65–0.85 Vn 0.4–0.6 Vn 200 5 Less
than
50ms
48–60 48
100–130 100–130
200–250 200–250
380–480
  • Note) Operating voltage range is the min. rated voltage standard for each rated voltage (Vn).

2. Specification of the wire

  • Refer to the below table regarding the length and specification of wire when using trip coil with DC 24–30 [V] or DC/AC 48–60 [V] of rated voltage.

The maximum wire length

  Rated voltage [Vn]
DC 24–30 [V] DC/AC 48 [V]
Wire type #14 AWG(2.08mm2) #16 AWG(1.31mm2) #14 AWG(2.08mm2) #16 AWG(1.31mm2)
Operating
voltage
100% 48.5m 30.5m 233.2m 143.9m
85% 13.4m 8.8m 62.5m 39.3m
  • Note) In case of using UVT coil, the location of TC coil is changed.