500-8067.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • Revision 05 31/121
Description
Releases Releases trip the circuit-breaker. The electrical opening command is transmitted to the OPEN
latch via a magnet armature by unlatching an energy store. Depending on the operating
mechanism used, up to 2 releases can be used.
Shunt release (-Y1) Shunt releases are used to trip or electrically open circuit-breakers. The opening command is
executed by application of an auxiliary voltage (AC or DC, depending on the design option).
After opening the circuit-breaker, the release is de-energized internally.
Undervoltage release
(-Y7)
Undervoltage releases are used to trip or electrically open circuit-breakers. During normal
operation, the shunt releases are supplied with a closed-circuit current from an auxiliary
voltage source (DC or AC, depending on the design option). When the auxiliary voltage falls
below a specific value, or when it is interrupted, the opening operation takes place.
C.t.-operated release (-Y6) The low-energy c.t.-operated release 3AX1104 (-Y6) is used for protection devices with a
pulse output, which are supplied with instrument transformer current. The tripping circuit is
supplied as well through the protection core of the current transformer. When a pulse of
0.1 Ws runs through the tripping circuit, the opening operation takes place.
Low-energy release (-Y6) The low-energy release (-Y6) is provided for use in combination with the transformer monitor
IKI-30 (make Kries) or the protection device 7SJ45 (make Siemens) supplied with instrument
transformer current. The tripping circuit is supplied through the current sensor or current
transformer. When a pulse of 0.02 Ws runs through the tripping circuit, the opening operation
takes place. The low-energy release is available for the vacuum circuit-breaker type 2.
Varistor module The varistor module limits switching overvoltages caused by tripping coils in circuits and
auxiliary circuits. The varistor module is integrated in the releases.
Circuit-breaker tripping
signal
When the circuit-breaker is tripped by a release (e.g. by protection tripping), there is a signal
through the NO contact -S6. If the circuit-breaker is tripped with the mechanical pushbutton,
this signal is suppressed by the NC contact -S7.
Power consumption of the operating coils
Operating coil Power consumption [W/VA]
Circuit-breaker type 2
Closing solenoid (Y9) ≤ 370
Shunt release (Y1) ≤ 370
C.t.-operated release (Y6) ≤ 30
Low-energy current release (Y6) ≤ 10
Undervoltage release (Y7) ≤ 20
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