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249 POWER SELECTOR BREAKER SYSTEM
The 249 Power Selector Breaker System combines
magnetic-hydraulic branch circuit overload protection
and a power system selector switch in one device.
The 249 is designed to allow selection of any one of
two, three or four independent power systems. This is
accomplished with fool-proof sliding-gate handle
covers. The number of sliding covers is one less than
the number of power systems. With this arrangement,
it is impossible to switch “ON” more than one power
system at a time.
Since the 249 Power Selector Breaker System is listed
as a Branch Circuit Breaker per UL 489 and power
switching is accomplished by UL listed breakers, it is
usually not necessary to include additional branch
service protection.
Standard options available include terminals for front
or back connections, choice of trip time delay, current
ratings to 100 amperes and single or multi-pole
sections.
Trip Time Delay
Three inverse time delays are available to permit close coor-
dination with various loads. Delays 51 and 61 are short
delays for electronic loads. Delays 52 and 62 are medium
delays for mixed loads. Delays 53 and 63 are long delays for
motor loads.
Current and Voltage Ratings
Single pole and multi-pole breaker ratings are available up
to 100 amperes, 240Vac or 125Vdc. The special configuration
for Marine use has a 120V/240Vac rating for current rating
up to 100 amperes.
Master Drawing
Standard circuit breaker terminal and configurations are
shown. For other types, consult factory.
175
209 Series - 249 Power Selector Breaker System
http://airpax.sensata.com
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