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Displays and operator controls
8.1 Overcurrent trip unit without LCD display
Characteristic
Application
curve
ETU10 for system protection, LI/LIN function
Overload protection I
0.95; 1 x I
Short-circuit protection (instantaneous)
I
= 1.25 to 11 x I
i
"SB", "MB", "LB", "TB" and "NB" versions
Neutral conductor protection
I
= 50% / 100% x I
n
versions
ETU20 for system and generator protection,
LSI / LSIN function
Overload protection I
0.95; 1 x I
Short-circuit protection (short-time delay)
I
= 1.5 to 10 x I
sd
I
t selectable on / off
2
Short-circuit protection (instantaneous)
I
= 11 x I
i
"SE", "ME", "LE", "TE" and "NE" versions
Neutral conductor protection
I
= 50% / 100% x I
n
versions
ETU12 for system protection,
LIG / LING function
Overload protection I
0.95; 1 x I
time-lag class t
Short-circuit protection (instantaneous)
I
= 1.25 to 11 x I
i
On 4-pole molded case circuit breakers:
neutral conductor
protection 50% / 100% × I
"TN"and "NN" versions
Ground-fault protection:
I
= 0.6 / 1.0 I
g
measuring method No. 1: (G
summation current formation in the three
phases and neutral conductor (4-conductor
systems); I
"MF", "TN", and "NN"
112
= 0.4; 0.45; 0.5 to
R
, time-lag class t
= 2.5 to 30
n
R
(size dependent)
n
, "TA", "LA" and "NA"
R
= 0.4; 0.45; 0.5 to
R
n
, t
= 0 to 0.5 s
R
sd
(fixed setting, size dependent)
n
, "TF", "LF" and "NF"
R
= 0.4; 0.45; 0.5 to
R
n
= 2.5 to 30
R
(size dependent)
n
R
, t
= 0.1 / 0.3 s
n
g
) vectorial
R
= I
, versions "SL", "SF", "ML",
Δn
n
View
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
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