I.B. 29C891B
Page 9
Effective 11/98
Models 750 and 1050 on K, L and N-Frame circuit
breakers are factory sealed. Model 550 equipped circuit
breakers and all R-Frame SPB and DSII circuit breakers
can be upgraded in the field.
2-4 SERIES C K, L-FRAME AND N-FRAME OPTIM
TRIP UNITS
The continuous frame rating of each circuit breaker is
selectable via rating plugs over the following range:
• K-Frame (70-400 amperes)
• L-Frame (200-600 amperes)
• N-Frame (400-1200 amperes)
The OPTIM Trip Unit applicable to the Series C K and L-
Frame molded case circuit breakers extends approxi-
mately 0.5 inches beyond the front of the breaker cover
(Figure
2-2
). The OPTIM Trip Unit used with the L-
Frame is not applicable to any other circuit breaker.
The OPTIM Trip Unit applicable to Series C N-Frame
molded case circuit breaker is nearly flush mounted to
the front of the breaker cover (Figure
2-3
). The OPTIM
Trip Unit used with the N-Frame is not applicable to any
other circuit breaker.
The side wiring brackets shown in Figures
2-2
and
2-3
are only necessary for Models 750 and 1050 on K, L
and N-Frame circuit breakers. Model 550 does not
need the bracket on the same frames.
2-4.1 K, L AND N-FRAME OPTIM TRIP UNIT
DISPLAYS
Readings are displayed and protective settings estab-
lished or adjusted through the use of one or more of the
following means:
• OPTIMizer Hand Held Programmer
• Breaker Interface Module
• Remote Computer/IMPACC software
OPTIM Trip Units provide the following features (Figure
2-4
):
Push-To-Trip Button
A Push-To-Trip button provides a local manual means
for checking the circuit breaker’s mechanical tripping
function and periodically exercising the operating mech-
anism. It is located on the front of the trip unit.
Mode of Trip/Alarm Indicators
Four LED type indicators (long delay, short delay,
instantaneous and ground fault trip or ground fault
alarm) are provided to indicate the mode of trip after an
automatic trip. The appropriate LED is lit red when acti-
vated.
Figure 2-2 OPTIM Trip Unit Mounted in Series C
L-Frame Circuit Breaker (K-Frame is Similar)
Figure 2-3 OPTIM Trip Unit Mounted in Series C
N-Frame Circuit Breaker
Summary of Contents for Digitrip OPTIM 1050
Page 7: ......
