3WL air circuit breakers
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - PROFIBUS
30 System Manual, 03/2011, A5E01051353-02
Basic function ETU45B ETU76B
Recording of the ground-fault current
via summation current conversion
with internal or external N-conductor
transformer
✓ ✓
Recording of the ground-fault current
via external transformer
✓ ✓
Adjustment range of the response
current I
g
for tripping
A-B-C-D-E A...E*
Adjustment range of the response
current I
g
for alarm
A-B-C-D-E A...E*
Adjustment range of the delay time t
g
100-200-300-400-500 ms 100...500 ms
Switchable ground-fault protection
(I
2
t-dependent function)
✓ ✓
Adjustment range delay time t
g
at I
2
t
100-200-300-400-500 ms 100...500 ms
NSE00889
ZSI-G function Per CubicleBUS module Per CubicleBUS module
Switchable – ✓
LCD alphanumeric (4-line) Optional –
LCD graphical – ✓
CubicleBUS integrated ✓ ✓
Communications capability via
PROFIBUS DP
✓ ✓
Metering function capability with
metering function PLUS
✓ ✓
Overcurrent release active ✓ ✓
Alarm ✓ ✓
ETU fault ✓ ✓
L tripping operation ✓ ✓
S tripping operation ✓ ✓
I tripping operation ✓ ✓
N tripping operation ✓ ✓
G tripping operation ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
G alarm ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Tripping operation as a result of
extended protection function
✓ ✓
NSE00890
Communication ✓ ✓
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