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Schneider Electric 3.0A User Manual

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48049-136-05 
Micrologic™ 2.0A, 3.0A, 5.0A, and 6.0A Electronic Trip Units
Rev. 01, 07/2012
Section 1—General Information
© 1999–2012 Schneider Electric All Rights Reserved
13-EN
EN
G
L
ISH
Indicator Lights
Ground-Fault Protection
Equipment ground-fault protection protects 
conductors against overheating and faults from 
ground-fault currents (
d1200 A).
•
Equipment ground-fault protection is 
standard on 6.0A trip units.
•
Ground-fault pickup (Ig) (A) sets ground 
current level where circuit breaker will trip 
after the preset time delay.
•
Ground-fault delay (tg) (B) sets the length of 
time that the circuit breaker will carry a 
ground-fault current above the ground-fault 
pickup current level before tripping.
•
Equipment ground-fault protection can be 
zone-selective interlocked (ZSI) with 
upstream or downstream circuit breakers. 
•
Setting the ground-fault delay (tg) to the 0 
setting turns off zone-selective interlocking.
•
Neutral protection and equipment ground-
fault protection are independent and can 
operate concurrently.
Figure 10:
Ground-Fault Protection Switches
Table 4:
Micrologic Trip Unit Ground-Fault Pickup Values
Ig  (=  In  x....)
A
B
C
D
E
F
G
H
J
In 
d 400 A
0.3
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
400 A < In 
d 1200 A
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
In > 1200 A
500 A 640 A 720 A 800 A 880 A 960 A 1040 A 1120 A 1200 A
In = sensor rating.
Ig = ground-fault pickup.
Table 5:
Micrologic Trip Unit Ground-Fault Delay Values
Setting
Ground-Fault Delay
I
2
t off (ms at In) (seconds)
0
0.1
0.2
0.3
0.4
I
2
t on (ms at In) (seconds)
–
0.1
0.2
0.3
0.4
tsd (min. trip) (milliseconds)
20
80
140
230
350
tsd (max. trip) (milliseconds) 80
140
200
320
500
NOTE: Use I
2
t off with ZSI for proper coordination. Using I
2
t on with ZSI is 
not recommended as the delay in the upstream device receiving a restraint 
signal could result in the trip unit tripping in a time shorter than the 
published trip curve.
.4
.5
.6
.7
.8
.9
.95
.98
1
delay
short time
I i
tsd
(s)
on   
 
I
2
t
.
2
.
3
.
4
.
4
.
1
.
2
.
3
.
1
0
off
instantaneous
long time
alarm
Ir
x In
ground fault
B
C
D
E
F
G
H
J
Ig
tg
(s)
on   
 
I
2
t
.
2
.
3
.
4
.
4
.
1
.
2
.
3
.
1
0
off
A
.5
1
2
4
8
12
16
20
tr
(s)
@ 6 Ir
24
setting
x Ir
2
2.5
3
4
5
6
8
10
Isd
1.5
x In
3
4
5
8
10
12
15
off
2
test
06133351
A
B
Micrologic 6.0A Trip Unit
Overload Indicator Light
The overload indicator light (A) lights when the Ir 
long-time pickup level has been exceeded (over 
100% on the bar graph).
Figure 11:
Overload Indicator Light
delay
short time
I i
tsd
instantaneous
long time
alarm
test
800
earth leakage
1
2
3
5
7
10
20
30
ΔI
(ms)
60
.5
140
230
350
I
Δn
(A)
setting
x Ir
2
2.5
3
4
5
6
8
10
Isd
1.5
on    
 
I
2
t
.
2
.
3
.
4
.
4
.
1
.
2
.
3
.
1
0
x In
2
2.5
3
4
5
6
8
10
1.5
.5
1
2
4
8
12
16
20
tr
(s)
@ 6 Ir
24
.4
.5
.6
.7
.8
.9
.95
.98
1
Ir
x In
40
%
%
100
06133352
A