6. OPERATION
6.1 Closing
In the open position, the magnetic actuator’s armature rests against the bottom plate in the
actuator assembly. The armature is held there by the force developed by the magnet. When the
top coil is energized, the magnetic flux generated is in the same direction as the magnet
assembly. The armature is drawn into the coil and brought into contact with the upper plate. In
this position, the coil is de-energized and the armature is held in position by the magnets alone.
As the armature is drawn into the coil, the operating rod, which is attached to the top guide rod,
moves the moving contact of the vacuum interrupter towards the closed position. The actuator
has more stroke than the vacuum interrupter and the interrupter contacts make contact before
the actuator has completed the stroke. The additional movement of the operating rod after the
contact closing causes the contact pressure spring to compress at the top of the operating rod.
This wipe allows for contact wear in service.
6.2 Opening
When the bottom coil is energized, the magnetic flux opposes the force generated by the
magnet assembly. This reduces the holding force, the armature is released and the coil attracts
the armature to the bottom plate. Once there, it is held open by the magnet.
6.3 Manual Trip Handle Operation
The trip handle for the 38 kV R-MAG has two states: Normal and Trip/Close Block, which are
described below in further detail.
Figure 3 Trip Handle Position Sticker
Normal Position – In the normal position, the external trip handle is up, and normal operation is
possible.
Trip/Close Block Position – When the trip handle is pulled down to this position, the breaker will
be opened and will not close until the handle is returned to the normal position.
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