6.2 Opening
When the bottom coil is energized, the magnetic flux generated 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.
7.0 OPERA
TIONAL CHECK PRIOR TO INSTALLATION
The breaker should be tested for mechanical and electrical operation before delivery to the
installation site. Make the necessary control power connections. Open the door of the low
voltage (LV) compartment to observe the mechanical operations. A manual trip handle is
provided on the outside of the cabinet. (See Figure 8)
7.1 Electrical Close and Open
Observe the position-indicator located on the front of the actuator cover plate. If the panel is
green, the breaker is open, and if the panel is red, the breaker is closed. To perform a close
or open, ensure the “Ready” light is illuminated above the Close (1), and Open (0), buttons.
Press the appropriate button firmly, keeping hands and loose clothing clear of operating
linkages. Nothing will happen if the open button is pressed if the breaker is already open and
conversely for close.
Note: In the event of a malfunction or loss of source voltage, the “Ready” light will not be
illuminated.
7.2 Vacuum Test
Make an over-voltage test on each phase assembly to verify that there has been no loss of
vacuum in transportation or handling. Experience has indicated that while a vacuum
interrupter with the vacuum seal intact will withstand 37.5 kVAC across the open contacts for
one minute, the same interrupter open to normal atmosphere will flashover at the gap at a
much lower voltage.
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