Users Manual

Description
2.3 Protection system
3WA Air Circuit Breakers
46 Equipment Manual, 05/2021, 92310000002-03
Changing the current rating
For the three sizes of the 3WA circuit breaker, the rated current In can be changed to the
values given in the table below by means of the option plug. The selected value should
correspond to the rated current of the power distribution system and must not exceed the
maximum rated current of the circuit breaker I
n max (see circuit breaker accessory label).
Rated current
Size 1
Size 2
Size 3
200 A ✓ ✓
–
250 A
✓
✓
315 A
✓
✓
400 A ✓ ✓
500 A
✓
✓
600 A
✓
✓
630 A
✓
✓
800 A
✓
✓
✓
1000 A
✓
✓
✓
1200 A
✓
✓
✓
1250 A
✓
✓
✓
1600 A
✓
✓
✓
2000 A
✓
✓
✓
2500 A
✓
✓
✓
3000 A
–
✓
✓
3200 A
✓
✓
4000 A
✓
✓
5000 A
–
✓
6000 A
✓
6300 A
✓
Changing the basic protective functions
Option plugs with the following basic protective functions are available for the ETU600
electronic trip unit:
Option plug with protective
function LSI
Option plug with protective
function LSIG GFx
Long time LT
✓
✓
Short time ST ✓ ✓
Instantaneous short-circuit protection INST
✓
✓
Ground-fault protection GF
–
✓
By exchanging the option plug and using an option plug LSI, the ground-fault protection GF
on the ETU600 LSIG electronic trip unit can be completely deactivated.