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Electronic trip unit LCD ETU
Characteristic
Application
curve
ETU40 for system protection, LI / LSI / LSIN
function,
ETU40M motor / generator protection, LI function
Overload protection I
Trip class t
Time-lag class t
Thermal image selectable on / off,
with phase failure sensitivity with ETU40M
(5 ... 50% I
"UP" version
Short-circuit protection (short-time delayed) on
ETU40
I
= 1.5 to 10 x I
sd
I
t selectable on / off on ETU40
2
"UH" and "UJ" versions
Short-circuit protection (instantaneous)
I
= 1.25 to 11 x I
i
ETU42 for system protection,LSIG/LSING
function
Overload protection I
Time-lag class t
Thermal image selectable on/off
Short-circuit protection (short-time delayed)
I
= 1.5 to 10 x I
sd
I
t selectable on / off
2
Short-circuit protection (instantaneous)
I
= 1.25 to 11 x I
i
Ground-fault protection:
Measuring method No. 1: (G
summation current formation in the three
phases and neutral conductor (4-conductor
systems); I
versions
Measuring method No. 2: (G
measurement of the ground-fault current using a
current transformer, I
0.5 s; "UM" version
On 4-pole molded case circuit breakers:
neutral conductor protection N: 50 to 100% I
selectable or adjustable.
For t
= 0, the ST function must be set to the value "disabled".
1)
sd
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
= 0.4 to 1 x I
R
n
= 5 to 30 at ETU40M
C
= 2.5 to 30 at ETU40
R
adjustable)
R
, t
= 0 to 0.5 s
sd 1)
R
(size dependent)
n
= 0.4 to 1 x I
R
n
= 2.5 to 30
R
, t
= 0 to 0.5 s
1)
R
sd
(size dependent)
n
) vectorial
R
= 0.4 to 1 x I
, "UL", "UM" and "UN"
Δn
n
) direct
GND
= 0.4 to 1 x I
g
8.2 Overcurrent trip unit with LCD display
View
,
, t
= 0.1 to
n
g
R
Displays and operator controls
115
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