Power Break
®
Circuit Breakers
Chapter 2. Breaker Operation
6
Application Notes
• Size the control power source according to the
information in Table 3. If a single source is to supply
several motor operators, it must be sized appropri-
ately. Where breakers are wired for automatic
charge, it may be necessary to supply power to several
motor operators simultaneously during start up.
• The control power source should be sized so that the
drop in voltage from no load to full load does not
exceed 7%.
• Acceptable dc power sources are the following:
– dc generator,
– battery,
– three-phase, full-wave rectified ac, or
– any other dc power source with a peak-to-peak
ripple voltage of not more than 15% of the rated
voltage at motor full-load current.
• Breakers built after approximately June 1978 are
equipped with an anticycling circuit that will lock out
the breaker if the latch fails to reset (such as due to a
deenergized UVR). Lockout occurs if the charge
time exceeds 20 seconds. Reset a locked-out breaker
locally by pushing the
OFF
button or remotely by
momentarily removing control power from the
motor operator.
2–3 Trip Unit Setup
N
N
N
NO
O
O
OT
T
T
TE
E
E
E:::: MicroVersaTrip RMS-9 trip unit rating plugs may
be changed per GEH-5369 and GEH-5371 without void-
ing the UL listing. MicroVersaTrip trip units and tap
changer cards may be installed or replaced per GEH-
4657 and this manual without voiding the UL listing.
MicroVersaTrip Plus and MicroVersaTrip PM trip units
and rating plugs may be changed or replaced per GEH-
6273 without voiding the UL listing.
MicroVersaTrip® and MicroVersaTrip®
RMS-9 Trip Units
Trip settings are installed at the factory with minimum
values on all functions. Customers will generally want to
adjust settings to their own requirements.
Adjusting Trip Settings
Use the following procedure to adjust trip settings on
these trip units:
1
1
1
1.... Remove the clear plastic protective window, shown in
Figure 4.
2
2
2
2.... Change the settings by twisting the indicator switches
to the desired values or multipliers. See GEH-4657 for
definitions of MicroVersaTrip functions and GEH-
5369 for MicroVersaTrip RMS-9 functions.
3
3
3
3.... Reinstall the window.
Rating Plugs
MicroVersaTrip RMS-9 trip units require the installation
of a rating plug in accordance with GEH-5369 and GEH-
5371 to set the maximum continuous current rating.
Tap Changer Card
Some MicroVersaTrip models include a tap changer card,
shown in Figure 9. When provided, this function allows
the customer to change the rating of the breaker frame.
Figure 9. Tap changer cards.
Summary of Contents for Power Break
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