Mitsubishi Electric C Series Handling And Maintenance page 52

(6) EAL (Earth leakage alarm switch)
This switch is for electrically indicating tripped state of an earth leakage circuit breaker at a ground
fault.
Operation of EAL switch
Condition of
Contact condition of EAL switch
circuit breaker
250A fram and
below
Tripped by overload
or short-circuit fault
400A fram and
ON·OFF
above
250A fram and
below
Tripped by ground
fault
400A fram and
above
Rating of EAL switch (250A frame and below)
AC
Current A
Voltage
Resistance load Induction load
V
200 3
100
3
Specify voltage as the switch for
100V differs from that for 200V.
Control power is necessary at each voltage. For wire connection,
see the drawing at right.
Rating of micro load EAL switch (400A frame and above)
AC
Microswitch Current A
Voltage
used Resistance
V
load
SB 125 0.1
VB 125 0.1
For use in micro current area, please enquire us separately.
(Note) For model of breakers to be assembled each type of micro
switch, refer to the catalogue.
1 Connect the wires in the right way. Wrong connection can cause malfunction or short circuit.
78
L
2
L (77)
1
2 Avoid electrification, ground fault and contact with the main circuit as EAL output is internally con-
nected with the control power.
Before starting operation, be sure to press the test button of the earth leakage circuit breaker to make
sure of operation. The test button doesn't operate unless voltage is applied between the right and left
pole of the breaker.
78 (open)
77
98 (open)
96 (closed)
95
78 (closed)
77
98 (closed)
96 (open)
95
Vertical type lead wire
terminal block
78
Indicator lamp
2
(Example)
L
Control
2
2
power
L (77)
1
source
DC
Current A
Voltage
Induction Resistance
V
load load
– 30 0.1
– 30 0.1
Malfunction
78
L
L
EAL wrong connection mode
Rating of EAL (400A frame and above)
Microswitch
Voltage
used
V
460
S
250
125
460
V
250
125
Rating of corrosion-proof EAL switch (400A frame and above)
Micro switch
of corrosion-
proof type
used
ST
VT
If the breaker is treated by the 1st kind moisture-fungus treatment or
by added corrosion-proof treatment, the micro switch of corrosion-
proof type is to be used.
SB
VB
AC:DC
125
100
60
30
(V)
Induction
load
10
–
–
5
0.67 1
For lower area than above limit of applicable load, use the switch for
minute load.
CAUTION
2
(77)
1
Malfunction
AC
Current A
Voltage
Resistance Induction
V
load load
– – 250
3 2 125
5 3 30
5 2 250
10 10 125
10 10 30
AC
Current A
Voltage
Voltage
Resistance Induction
V
load load
–
460 – 250
3
250 2 125
125 5 30
3
1
460 0.5 250
5
250 4 125
125 5 30
4
X
AC
DC
4 26 50 100 160
(mA)
Connection which
causes short-circuit
78
L
2
L (77)
1
Malfunction
DC
Current A
Resistance Induction
load load
0.2 0.2
0.4
0.4
4
3
0.3 0.3
0.6
0.6
10 6
DC
Current A
Resistance Induction
V
load load
0.2
0.2
0.4 0.4
3
4
0.3
0.3
0.4 0.4
3
5
S, ST
V, VT
600
50