Siemens SENTRON 3VL - Page 49

Functions
5.1 Current protection
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
49
Order No.
supplement
Trip unit Thermal
memory
Phase failure Communicati
ons capability
Ground-
fault
protection
Number
of poles
N pole
protected
1)
SG
MG
SH
MH
TH
NH
ETU22
ETU22
ETU22
ETU22
ETU22
ETU22
✓
✓
✓
✓
✓
✓
-
-
-
-
-
-
-
✓
4)
-
✓
4)
-
✓
4)
①
①
①
①
②
②
3
3
3
3
4
4
-
-
-
-
50 / 100 %
50 / 100 %
SS
MS
ETU30M
3)
ETU30M
3)
✓
✓
40% I
R
40% I
R
-
✓
4)
-
-
3
3
-
-
CP
CH
CJ
LCD-ETU40M
3)
LCD-ETU40
LCD-ETU40
✓
✓
✓
5 to 50% I
R
-
-
✓
5)
✓
5)
✓
5)
-
-
-
3
3
4
-
-
50 /100 %, OFF
CL
CM
CN
LCD-ETU42
LCD-ETU42
LCD-ETU42
✓
✓
✓
-
-
-
✓
5)
✓
5)
✓
5)
①
① / ③
②
3
3
4
-
-
50 / 100%, OFF
1)
Dependent on frame size
2)
TM to I
n
= 630 A
3)
Motor protection to I
n
= 500 A
4)
With COM20/COM21
5)
With COM10/COM11
① Vectorial summation current formation (3-conductor system), see 1st figure in Chapter
Ground-fault protection (Page 58)
② Vectorial summation
current formation (4-conductor system), see 2nd and 3rd figures in
Chapter Ground-fault protection (Page 58)
③ Direct capture of the gro
und fault current in the neutral point of the transformer, see 4th
figure in Chapter Ground-fault protection (Page 58)