802-9081.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 11 25/293
Description
• Interlocking of feeder locking device against three-position disconnector and cable
compartment cover
- Circuit-breaker only lockable in earthed position
- Cable compartment cover only removable in earthed position
Possible release combinations
9.2 Vacuum contactor
Design The Siemens high-voltage vacuum contactor 3TL72, 3TL73 and 3TL74 is a three-pole indoor
contactor for rated voltages from 7.2 kV to 24 kV. The vacuum contactor can be controlled
from remote and has an electromagnetic operating mechanism suitable for high switching
rates and unlimited operating time. The electromagnetic operating mechanism is suitable for
AC operation or DC operation.
The vacuum contactor consists of the following components:
• Operating mechanism with magnetic actuator and control elements
• Three contactor poles with vacuum interrupters
• Partition plate
• Operating rods for contact operation, mounted in the vessel front (mounting plate) in a
movable way and without seals by means of welded-in metal bellows.
• Mechanical closing latch
The vacuum contactor is latched mechanically in CLOSED position. A latch then holds the
vacuum contactor in closed position even without auxiliary voltage.
The vacuum contactor is released electrically either mechanically by means of a pushbutton
in the switchgear front, or electrically (option) by a shunt release or undervoltage release.
The operating mechanism box accommodates all electrical and mechanical components
required for closing and opening the contactor.
The vacuum contactor has opening springs to ensure that the contactor switches off if the
supply voltage fails.
Equipment The basic version of the vacuum contactor is equipped as follows:
• Electromagnetic operating mechanism for unlimited operating time
• Auxiliary switch with 3NO + 4NC freely available
Optional • Extended auxiliary switch with 5NO + 6NC freely available
Release Release combination
1 2 3 4 5
1st shunt release Type 3AY1510 X X X X X
2st shunt release Type 3AX1101 – X – – X
C.t.-operated release Type 3AX1102; 0.5 A or – – X – X
Type 3AX1104, 0.1 Ws
Undervoltage release Type 3AX1103 – – – X –
X: 1 unit of each release, a maximum of 3 releases can be combined
①
Pole support
②
Vacuum interrupter
③
Switchgear vessel
④
Metal bellows
⑤
Operating mechanism box
⑥
Auxiliary contactors and
rectifiers
⑦
Operating kinematics
⑧
Mechanical lockout
⑨
Magnet coil
⑩
Mechanical closing latch
⑪
Electrical latch release
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