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16.1 Load current LED
The current value which is used as the reference of the load current indication LED varies depending on the
characteristics setting.
Usage
General
protection use
16.2 Pre-alarm function
When the current exceeds the pre-alarm current setting (Ip), the PAL LED will blink. When the half time of LTD
time passes, the PAL LED will light and output the contact. For the operation time, refer to the characteristic curve.
When an ETR with DP is used and the load current exceeds the pre-alarm current setting (Ip), the back light
of the liquid crystal display (LCD) will change from white to red.
(The back light will only change to red. Pre-alarm information will not be displayed on the LCD.)
Ip
Load current
PAL LED
PAL contact
output
16.3 Control power supply
It is necessary for trip indicator (LED, output contact) operation and current indication. For overcurrent and
short-circuit protection, even if there is no control power supply, the operation is done using the internal CT energy.
Power supply module
Type
Rated voltage
100-240 AC (50/60 Hz)/
P3
100-125 DC
P4
24-60 DC
Contact capacity (Type P3 and P4)
Voltage (V)
AC
(50/60 Hz)
DC
(Note) Taking into consideration the capacity of voltage drop due to factors other than the circuit breaker, set
the working voltage range of the power supply capacity.
E-32
ETR type
Base current
Iu
S1
Uninterrupted
current
Lighting
Blink
ON
1/2 T
L
Applicable voltage
range (V)
85-264 AC
85-138 DC
18-72 DC
Resistive load
cosφ = 1.0
240
1
120
1
125
0.1
30
1
When the "OVER" LED is lighting, the current value
LED indication
is over LTD pick-up current. The circuit breaker
OVER
carries out trip operation after specified time.
100
80
60
%Iu
Current
OFF
Elapsed time (t)
Criterion for
power requirement (VA)
15
10
Current (A)
Inductive load
Alarm output
5 output contacts
5 output contacts
cosφ = 0.4
L/R = 0.7
0.5
1
0.05
1
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