Siemens 8DJH Series Installation And Operating Instructions Manual page 46

Description
Shunt releases
Undervoltage release
Circuit-breaker tripping
signal
C.t.-operated release (Y6)
Low-energy magnetic
release (for type 2)
Varistor module
46
Shunt releases are used for automatic or deliberate tripping of circuit-breakers.
They are designed for connection to external voltage (DC or AC voltage).
They can also be connected to a voltage transformer for deliberate tripping.
Shunt releases based on two principles (Y1, Y2) can be used:
• With the shunt release (Y1) the circuit-breaker is opened electrically.
Power consumption: 140 W or 140 VA.
• With the shunt release (Y2) the electrical opening command is transferred
magnetically and thus, the circuit-breaker is opened.
Power consumption: 70 W or 50 VA.
Undervoltage releases are tripped automatically through an electromagnet or
deliberately. The deliberate tripping of the undervoltage release generally takes place via
an NC contact in the tripping circuit or via an NO contact by short-circuiting the magnet
coil. With this type of tripping, the short-circuit current is limited by the built-in resistors.
Power consumption: 20 W or 20 VA.
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 deliberately with
the mechanical pushbutton, this signal is suppressed by the NC contact -S7 .
The following c.t.-operated releases are available:
• The c.t.-operated release 3AX1102 consists of an energy store, an unlatching
mechanism and an electromagnetic system. Rated tripping current: 0.5 A/1 A
• The c.t.-operated release 3AX1104 (low-energy release) is adequate for
a tripping pulse of ≤ 0.1 Ws in connection with adequate protection systems.
It is used if auxiliary voltage is missing, tripping via protection relay.
For tripping pulse 0.01 Ws, tripping via transformer monitor (IKI-30).
Integrated in the releases.
Revision 03 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * 500-8067.9