Masterpact® circuit breaker
advantages
improved features
•
segregated compartment
Once the front cover has been removed,
giving access to the auxiliary compartment,
the main contacts remain fully isolated.
Furthermore, interphase partitioning allows
full insulation between each pole even if the
front cover has been removed.
•
isolation function by positive
indication of contact status
The mechanical indicator is truly
representative of the status of all three main
contacts.
•
reinforced insulation
Two insulation barriers separate the front of
the circuit breaker from main circuits.
•
disconnecting through door
The racking handle and racking mechanism
are accessible through the front door cutout.
Disconnecting the circuit breaker will
therefore be possible without opening the
door and giving access to live parts.
MP1 029A.O
state of the art protection
and control
The circuit breaker can be equipped with a
microprocessor-based, electronic control
unit which provides all the traditional
protection of the universal power circuit
breaker (long-time, short-time, instantaneous
and ground-fault)
®
plus other built-in
functions:
•
rms sensing (standard)
•
alarm switch (standard)
•
overcurrent trip switch (standard)
•
interchangeable rating plugs (standard)
•
thermal memory and Ft ramp
(standard on STR 38-58 control unit)
•
defeatable instantaneous
(standard on STR 38-58 control unit)
•
zone-selective interlocking for ground
fault and short time (option)
•
current and load meter (option)
•
load monitoring outputs (option)
•
fault indicators (option)
•
communication ability (option)
4
MP1 030A.O
control units
STR 280
STR 38S
STR 58U
•
segregated alarm switch
zone-selective interlocking
load monitoring
communication outputs
CD
long-time pickup at
1 . 1
current setting
@
defeatable on
N1
and
H1
types
®
two types: residual sensing (T) or residual
source ground return (W)
fixed
cv
adjustable
cv
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