Description
30 9229 0025 176 0E
2021-11-15
Undervoltage release (-Y7) 3AX1103-..
Damage due to missing or incorrect series resistor! Operation without series re-
sistor (-R1) can cause damage.
The undervoltage release (-Y7) may only be operated with the supplied series resis-
tor (-R1).
For circuits (mechanical or electrical), the undervoltage release 3AX1103-.. must be
connected to control voltage, as otherwise closing is not possible (see “Removing
the transport block from the undervoltage release”, page 52).
The undervoltage release (-Y7) has an electromagnetic system that is always live
when the vacuum circuit-breaker is in the closed state. If the voltage drops below a
certain value, the undervoltage release (-Y7) is unlatched, thus initiating opening of
the vacuum circuit-breaker via the energy storage mechanism.
Random tripping of the undervoltage release (-Y7) is generally performed by an NC
contact in the tripping circuit, but can also be done with the aid of an NO contact by
short-circuiting the solenoid coil. If this release method is used, the solenoid coil’s
short-circuit current is limited by the built-in resistor.
The undervoltage release (-Y7) can also be connected to voltage transformers.
The undervoltage release (-Y7) automatically trips the vacuum circuit-breaker if the
rated supply voltage drops to an inadmissible value.
Undervoltage releases (-Y7) DC 60 V are protected against overvoltage by a var-
istor. Undervoltage releases (-Y7) AC/DC 100 V are equipped with a rectifier.
Power consumption 20 W / VA
Fig. 34 Undervoltage release (51.7), depending on
the voltage with one resistor or two resistors
Fig. 35 Sample circuit for connection of the undervolt-
age release (-Y7)
(-R1) Resistor
(-S1) Auxiliary switch
(-Y7) Undervoltage
release
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