TERASAKI AME Series, Instruction Manual

Page: 15 / 40

KRB-5200h
-9-
3.3 Connection and Specifications of Accessories
3.3.1 Undervoltage Trip Device (UVT)
The UVT is optional.
Check if the rated voltage shown on the accessory
nameplate (attached on the ACB left side) is
suitable for the working voltage.
The UVT trips the ACB when the supply voltage
(between U
1
and U
2
) lowers to the opening voltage
with a delay of 50 ms to 120 ms, and closes the ACB
when the supply voltage returns to the resettable voltage.
The UVT also allows ACB remote instantaneous tripping by closing the path between T
1
and T
2
.

The UVT operating mechanism permits the ACB to trip open at the open-circuit voltage or less,
only when the ACB operating handle is in the ON position. Accordingly, reset operation is
allowed even if the UVT coil is not excited.

The UVT coil also serves as an overcurrent trip coil.
1) Connection
Connect the trip signal wire and power supply wire to the auxiliary circuit terminals as shown in
Fig. 4.
For the rear-connected ACB, connect the wires to the specified terminals on the left side of the
ACB.
For the plug-in ACB, connect the wires to the specified terminals on the rear side of the mounting
base.
Fig. 4
UVT Connection Diagram
Caution : The voltage between terminals T1 and T2 is 20 VDC and the operating current is 10
mA.
Caution : For rear-connected ACB, be sure to replace the terminal cover (transparent) after
connecting the wires.
2) Ratings

Operating Voltage and Exciting Current
Rated voltage
(at 50/60 Hz)
Opening voltage Resettable voltage
Exciting current U1 - U2
(at 60 Hz)
100 - 115 VAC 41 -70 V 85V or less 21 mA
200 - 230 VAC 81 - 140 V 170V or less 11 mA
380 - 450 VAC 158 - 266 V 323V or less 6 mA
UVT CONTROL DEVICE
AC 450 V,50 / 60Hz
Electrical
Trip Terminal Source
1A0321SAA
450
T
1
T
2
U
1
U
2
CONTROL DEVICE
U1
U2
T1
T2
OCR controller
Y
Z
T
N
UVT
Trip
signal
Power
supply
Interlock switch
Note: The voltage between
terminals Y and Z is 24 VDC