Installation Instructions
The following instructions are for the installation of a Siemens JD main breaker kit in a 400 amp Type P1 panelboard.
The parts provided in this kit connect Type JD main breakers to 1 phase, 2 or 3 wire systems or to 3 phase, 3 or 4 wire
systems. For all 1 phase systems, disregard the B-phase connector instructions. For 1 phase 2 wire and 3 phase 3 wire
systems, disregard the neutral instructions. The breaker is not included in the kit and must be purchased separately. Be
sure to select the appropriate breaker for the voltage, system, and feed location in use.
Bottom-feedmainsarereversefed,andrequireTypeJXDbreakers.Top-feedmainsmaybeeitherTypeJDorJXD:
To install the main breaker:
1. Lock off all power to this equipment before working on it.
2. Removethedeadfrontandmainlugs,ifinstalled.Refer
to Figure 2 on page 4 to determine the correct breaker
mountingforthe panel'sfeedlocation. Insertthetwo
1/4"-20x 2-3/4" selfthreading screws (item 9)through
theappropriateendofthebreakercaseandthroughthe
outer holes on the support barrier (item 8) as shown in
Figure1, to retainthe barrier during installation.Fasten
the breaker to the support.
3. Position one of the outer breaker connectors (items 1 &
2) so that the single-hole end rests on the breaker pad
andthe double-hole end rests on the panel section or
main bus. Note that the outer conncetors are mirror
imagesand arenot interchangeable.Attach the
conncetorto the breaker padusing a 3/8"-16machine
screw. (item 10), a helical spring lock washer (item 11),
and a plain washer (item 12) as shown. Do not tighten at
this time. Repeat the process to attach the other outer
connectortothebreaker.
4. 3 phase panels require a B-phase connection. Stack the
upperB-phaseconnector(item3)abovethelower
connector (item 4). Attach the single-hole ends to the
centerpolebreakerpadusingidenticalhardware(items
10, 11, & 12) as for the outer connectors. Do not tighten
at this time.
5. Fasten all breaker connectors to the panel section or
mainbus usingtwo 5/16"-18 threadforming SEMS
screws (item 13) per joint. Torque the screws to the
valueindicatedonthetighteningtorque labelonthe
rearofthedeadfront.
6. Torqueall3/8"-16machinescrews atthebreaker
connections to 228 in-lb.
7. On 1 phase 3 wire systems and 3 phase 4 wire
systems,neutral lugs are required. Loosenthe wire
binding screw in the lay-in lug (item 5), remove the cap
plate, and place the lug on the lug pad inside the neutral
barrier cavity, as shown. Align the two lug holes with the
mounting holes on the lug pad centerline. Fasten the lug
withtwo 1/4"-20 thread formingscrews (item 14). Place
the tang lug (item 6) in the other barrier cavity, and align
its hole with the innermost lug pad hole. See Figure 2 on
page 4 for the correct position. Fasten the lug using a
1/4" -20 self threading screw (item 14) with a plain
washer(item 15). Torque alllug mounting screws to the
valuesindicatedonthe tighteningtorquelabel onthe
rearofthedeadfront.
8. Removethe mainlugfillerplatefromthedeadfrontmain
openingif present. Refer againto Figure 2on page 4, to
determinethecorrectorientationofthedeadfrontmain
fillerplate (item 7)for the panel's feedlocation. Fasten
the filler plate to the back of the dead front using four #8-
32 screws (item 16) screwed in from the front. Apply the
"MAIN"label (item17)as shown.
9. Beforeenergizingthepanel,ensurethat allconnections
havebeentorquedandthedeadfrontisinstalled.
PAGE3
MBKJD1&MBKJD3
Hazardous voltage.
Will cause death or serious
injury.
Keep out.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
TopFeedMainBreakers
BottomFeed MainBreakers JD,HJD,JXD,HJXD
JXD,HJXD
The400AP1panelprovideswiringspaceforthefollowingcableoptions:
(2)250 MCM line cables perphase
(1)600 MCM linecable per phase UsebreakerlinelugTA2J6500orcopperlugTC2J6500
UsebreakerlinelugTA1L6750orcopperlugTC1J6600
