Effective 10/2004
Page 9
I.L. 70C1036H05
To remove the trip unit from the circuit breaker, deflect the
top and bottom spring clips to release the unit from the
black mounting platform. Pull the unit to disengage the trip
unit’s printed circuit board connectors J0 & I1 from the
circuit breaker
(See Figure 1.2 and Appendix C).
1.4 Wiring
The internal components of the circuit breaker and their
connection points to the secondary contacts, are shown in
the breaker master connection diagram provided on page
47 as Appendix C.
1.5
Plexiglass Cover
A clear, tamper-proof plexiglass door sits on the circuit
breaker cover. This door, if sealed, allows the settings to
be viewed but not changed, except by authorized person-
nel. The plexiglass cover meets applicable tamper-proof
requirements. The cover is held in place by two cover
screws. Security is insured by the insertion of a standard
meter seal through the holes in both of the cover retention
screws. The plexiglass cover has an access cutout for the
View Functions group of pushbuttons and the Battery Test
pushbutton.
1.6 DT 1150 Power/Relay Module
The Power/Relay Module
(See Figure 1.4)
is a standard
device for the Digitrip 1150 model. The module is installed
on the molded platform under the trip unit in the Magnum
Circuit Breaker. There are four style modules that cover
the following input voltage ratings: 120 VAC, 230 VAC, 24-
48 VDC and 125 VDC (100-140 VDC operating range). The
burden of the Power/Relay Module is 10VA. Check circuit
breaker cover label marking for proper trip unit power and
voltage rating.
1.6.1 Auxiliary Power
When the module is wired and supplied with proper
voltage, it will provide an auxiliary power supply so that the
DT 1150’s (LED) display will be functional even when the
circuit breaker has no load. A Digitrip 1150 unit
without
auxiliary power will not provide voltage, display any data or
communicate.
1.6.2 Alarm Contacts
A second function of this module is to provide either a trip
or alarm output contact via the two customer programmed
relays within the module. An assortment of relay functions
can be assigned to these relays.
(See the Aux Relay
programming in Appendix D-15 and Appendix G).
Each
relay is a normally open contact with a programming
identification of RELAY A and RELAY C. On the Breaker
Master Connection Diagram (Appendix C) these contacts
Figure 1.3 Installation of the Rating Plug and Mounting
Screw
CAUTION
DO NOT FORCE THE RATING PLUG INTO THE CAVITY.
Use a 1/8" (3 mm) wide screwdriver to tighten the M4
screw and secure the plug and the trip unit to the circuit
breaker
(See Figure 1.3)
. Close the rating plug door.
CAUTION
THE M4 SCREW SHOULD BE TIGHTENED ONLY UNTIL
IT IS SNUG. DO NOT USE A LARGE SCREWDRIVER. A
1/8" (3 mm) WIDE SCREWDRIVER BLADE IS AD-
EQUATE.
1.3.3 Trip Unit/Rating Plug Removal
To remove the rating plug from the trip unit, open the rating
plug door. Use a 1/8" (3 mm) wide screwdriver to loosen
the M4 screw. Pull the door to aid in releasing the rating
plug from the unit.
