3RU11, 3RB10, and 3RB12 overload relays
SIRIUS System Manual
4-20
GWA 4NEB 430 0999-02b
Ground fault
In the event of a ground fault, the device trips instantaneously; depending
on the device variant, this may occur via a separate output (1 NO contact/1
NC contact).
Remote/automatic
reset
Remote or automatic resetting can be implemented by means of external
wiring (Y1-Y2 terminals).
Important
In the case of ground fault tripping, an automatic reset is not possible.
Te s t
The device functions of current detection, thermistor input, and ground fault
input and the tripping functions of the auxiliary contact elements can be
tested by pressing the test/reset button.
The device functions can also be tested during operation. The LEDs indicate
the status.
Internal failure
Self-monitoring causes the device to trip in the event of an internal fault. In
this case, the overload relay cannot be reset.
Failure of the control
supply voltage
In the event of the failure of the control supply voltage for any length of time
(> 0.2 seconds), the output relays respond in either a monostable or
bistable manner, depending on the variant involved.
The following table shows the behavior of the output relays in the event of
the failure of the control supply voltage:
Table 4-7: Failure of the control supply voltage
Behavior of the
output
relays
given:
Monostable
3RB12..-....0
Bistable
3RB12..-....1
Failure of the control
supply voltage
Device trips No change to the
switching status of
the auxiliary contact
elements
Return of the control
supply voltage without
prior tripping
Device resets
Return of the control
supply voltage after prior
tripping
Device remains tripped
Reset at:
- Overload tripping after 5 minutes
- Thermistor tripping when 5 K under the
operating temperature reached
- Ground fault tripping immediately
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