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Two-step stored energy mechanism for manually and
electrically operated breakers
The potential energy is stored in the mechanism to close
the breaker in five cycles or less. Sufficient energy to
open the breaker remains available following the closing
operation.
After closing, the charging spring can be recharged to
provide potential energy for reclosing following a fault,
providing high continuity of service. This feature allows
for the following sequence:
charge – close – recharge – open – close – open.
On manually operated breakers, closing springs are
charged by hand. For electrically operated breakers,
springs are charged by an electric motor but can be
manually charged if no power is available.
Secondary wiring points.
Field installable accessories (three maximum).
Digitrip RMS trip unit.
Optional electric charging motor.
Manual charging handle.
Optional operations counter.
Optional “Off” key lock.
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Padlockable levering device.
Breaker position indicator.
Secondary contacts.
Arc chute covers.
Primary finger cluster disconnects.
Current sensor window.
Rigid frame housing.
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Designed for easy access, inspection,
and minimal maintenance
The stored energy mechanism, control devices,
accessories, and secondary contacts are easily accessible
by removing the front cover … held in place by four
captive screws. For safety, this can only be done when
the breaker is in the disconnect position or removed from
the cell.
The current sensor viewing window on the rear of the
breaker allows for easy identification of the current
sensor mounted inside.
A contact wear indicator eliminates the need for
elaborate testing to determine if the contact assembly
needs replacing.
A look inside the Magnum
This rear view of a Magnum drawout breaker
shows the designed-in safety feature of
locating the primary disconnects and
secondary contacts on the removable breaker
element for easy and safe inspection.
Positioning of the secondary contact
subassembly is dedicated for installation,
maintenance, and testing. Top view shown
with breaker cover removed, bottom of photo
is front of breaker.
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