SIRIUS 3RV2 motor starter protectors
4.9 Accessories
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
417
Undervoltage release with leading auxiliary contacts
The undervoltage release with leading auxiliary contacts has the same function as the
undervoltage release without auxiliary contacts.
Additional functions:
● The auxiliary contacts ensure that the undervoltage release is only energized during the
motor starter protector's ON time.
● The auxiliary contacts isolate the overvoltage release from the line on both sides when
the voltage is disconnected or in the event of tripping, thereby preventing vagabond
voltages from getting into the control circuit when the switch is set to OFF. This requires a
conductive connection between outputs D2 and 08.
● Because the contacts are leading contacts, the power supply to the undervoltage release
is assured before the remaining steps involved in switching on are carried out.
4.9.5.2 Auxiliary release voltage ranges
Table 4- 16 Undervoltage release voltage ranges
Frequency
Auxiliary release
DC 50 Hz AC 60 Hz AC
24 V -
110 V 120 V
- 208 V
230 V 240 V
400 V 440 V
415 V 480 V
Undervoltage release 24 V
500 V 600 V
230 V 240 V
400 V 440 V
Undervoltage release with leading
auxiliary contacts
-
415 V 480 V
Table 4- 17 Shunt release voltage ranges
Frequency
Auxiliary release
50/60 Hz AC
100% ED
1)
50/60 Hz AC; DC
5 s ED
2)
20 to 24 V 20 to 70 V
90 to 110 V 70 to 190 V
210 to 240 V 190 to 330 V
350 to 415 V 330 to 500 V
Shunt release
500 V 500 V
1)
The voltage range is valid for 100% (infinite) ON period. The response voltage lies at 0.9 of the lower limit of the voltage
range.
2)
The voltage range is valid for 5 s ON period at 50 Hz/60 Hz AC and DC. The response voltage lies at 0.85 of the lower
limit of the voltage range.
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