Masterpact ® circuit breaker
control u nits
rating plug
long-time
short-time
discriminated
option
I
inverse time
alarm
transmitted
values
4 to 6 rating plugs available per sensor rating: see STR 280 control unit
current setting 0.8 to 1 x rating plug (pick up at 1 . 1 x current setting)
delay bands
0.94 - 1 .88 - 3.75 - 7.50 - 1 5 - 30s at 6 x current setting
thermal memory as standard with min./max. selector
pickup
1 .5 to 1 0 x current setting
delay bands
0 - 0 . 1 - 0.2 - 0.3 - 0.4 with l2t OFF
0.1 - 0.2 - 0.3 with l2t ON
pickups
lc2
=
0.5 to 1 x current setting
circuit breaker status: open, tripped, closed
alarms: overload, type of fault, internal watchdog
®
C])
see values on pp. 24 to 26
@ control power not required for loads greater than
20% of current sensors. Required for load less than
20% of current sensors if maximum demand memory
requested. (See diagram p. 29)
121
residual scheme. The maximum ground-fault
pickup meets 1 993 National Electrical Code
paragraph 230-95 (a) (not exceeding 1 200A)
Source Ground Return scheme on request
@
0.1 minimum pickup only with external power
®
total accuracy including current sensors:
±
4.5%
® internal watchdog: control unit internal temperature
and microprocessor proper operation monitoring
STR 58U
for universal application
9
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