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3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
GWA 4NEB 430 0999-02b
4-15
4.3 Application and use
4.3.1 3RU11 thermal overload relay and 3RB10 electronic overload relay
3RB10
The 3RB10 electronic overload relays are developed for use in sinusoidal 50/
60 Hz voltage networks. No additional supply voltage is required for opera-
tion. The current transformers are integrated in the devices for the purpose
of current detection. An ASIC checks the current values of each phase and
causes tripping in the event of an overload or phase loss.
3RU11
3RU11 front view:
Figure 4-4: 3RU11 front view
Functions
1
Scale for setting the load rated current
2
Reset button (blue):
Press the RESET button to get the relay ready before putting it into
operation or after tripping.
3
Stop button (red):
The stop button opens the normally closed contact, which remains
open until the button is released again. The downstream contactor and
thus the motor can be switched off.
Press the STOP button to switch the relay off when it is in operation.
The normally closed contact of the auxiliary switch opens. The relay
remains ready for operation.
4
Device type plate
5
Terminals for three motor supply lines
6
Terminals for normally closed/normally open contacts (95/96 for
normally closed contacts, 97/98 for normally open contacts)
7
Contact position indicator/test
The slider for the contact position indicator also serves as a test func-
tion. When it is operated, tripping of the overload relay is simulated.
The normally closed contact (95/96) opens, and the normally open con-
tact (97/98) closes. The switching position is indicated.
8
Switch for manual/auto RESET:
By pressing and turning the blue button you can select automatic or
manual reset.
In the case of the relay setting M (manual reset), the switching position
of the relay is indicated:
I = ready for operation
O = tripped
9
Only in the case of frame size S00:
Terminal A2: repetition terminal of the contactor coil
Terminal 14/22: repetition terminal of the contactor auxiliary switch
95
96
97
98
STOP
RESET
A2
2T2
4T2
6T3 14/22
M
A
TEST
7
1
9
9
5
6
3
2
8
4
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