Siemens MBKVA41A User manual

MBKVA41A or MBKVA41B
BL / BQD / xGB / 3VA4
Main / Subfeed Breaker Kit for
P1-250 Panelboard (or P1-400 Subfeed)
Installation
Instructions
11-A-1193-01 Rev. 00
-4-
(for use in Revised P1 Panelboards ONLY)
To confirm, note the part number of the panel (marked on the interior label).
If it ends in an “N” or a “T” it is a “Revised P1” and is compatible with this kit.
(For example: P1E42MC250A is an Original P1; P1E42MC250AT is a Revised P1)
1
1
These instructions do not purport to cover all details or variations in equipment, or to provide for every possible
contingency to be met in connection with installation, operation or maintenance. Should further information be
desired or should particular problems arise, which are not covered sufficiently for the purchaser’s purposes, the
matter should be referred to the local Siemens sales office. The contents of this Instruction manual shall not
become part of or modify any prior or existing agreement, commitment or relationship. The sales contract
contains the entire obligation of Siemens. The warranty contained in the contract between the parties is the sole
warranty of Siemens. Any statements contained herein do not create new warranties or modify the existing
warranty.
Trademarks - Unless otherwise noted, all names identified by ® are registered trademarks of Siemens AG or
Siemens Industry, Inc. The remaining trademarks in this publication may be trademarks whose use by third
parties for their own purposes could violate the rights of the owner.
(xGB shown)
S
(3VA4 shown)

Installation Instructions
11-A-1193-01 Rev. 00
-3-
-2-
DANGER
Hazardous voltage.
Will cause death or
serious injury.
Keep out.
Qualified personnel only.
Disconnect and lock off all
power before working on
this equipment.
9. Torque all connections to the values specified on
the Hardware Tightening Torque label affixed to
the rear of the deadfront.
5. Position the breaker barrier assembly (Item 1) at the
MAIN END of the panel. (See Fig. 1) Ensure the
straps are
properly snapped into the barrier and then
align them
with the panel bus. Secure the straps to
the phase bus with 1/4”-20 SEMS screws (Item 5).
Do not tighten at this time.
8. On 1-phase 3-wire and 3-phase 4-wire systems the
neutral lug assembly (Item 4) is required. The
neutral lug assembly arrives in the kit ready to
assemble at any open corner. Locate the neutral
lug assembly at the corner closest to where the
cables will terminate into the breaker. Install by
positioning it below the neutral cross bus or the
neutral lug pad, inserting the exposed stud through
the appropriate hole and
securing with the 1/4”-20
belleville washer nut (part of Item 4).
The following instructions are for the installation of a Siemens main/subfeed breaker kit for Type BL, BQD, xGB or 3VA4
breakers in Revised P1 Panelboards. The kit may be installed as a main or a subfeed in panels rated 250 amps or less.
For Revised P1 400A panels, it may be installed in subfeed applications ONLY (see Fig. 4). The parts provided in this kit
are for connection to a 1-phase 2 or 3-wire system in kit MBKVA41A or for connection to a 3-phase 3 or 4-wire system in
kit MBKVA41B. The breaker is NOT included with this kit and must be purchased separately. Be sure to choose the appro-
priate breaker for the system in use. For systems with no neutrals, disregard the neutral connection.
6. Secure the breaker barrier assembly to the base
rails with
two #10-24 screws (Item 6). Do not
tighten at this time.
4. Prepare the kit based on the breaker type:
BL/BQD breaker: Position the breaker support
bracket (Item 8) onto the breaker barrier assembly
(Item 1) by swinging the hooks on the bottom of the
bracket into the proper holes on the breaker barrier
assembly. (See Fig. 2 & 3) Complete assembly by
inserting a 1/4”-20 screw (Item 5). Torque to 40 lb-in.
xGB/3VA4 breaker: Proceed to Step 5.
10. Attach the main cables to the breaker and neutral
terminal and torque connections
to values specified
on the device. If no values are listed on the device,
refer to the Hardware Tightening Torque label
affixed to the rear of the deadfront.
11. Remove the blank filler or escutcheon installed
on any deadfront opening in the area that will
cover this kit. Install the escutcheon (Item 2)
provided with this kit into the front of the
deadfront as shown. (This escutcheon has
a rib on the rear whose orientation should be
towards the unit space for proper fit.)
NOTE: If installing a 2-pole breaker, use the
blank filler (Item 9) by inserting it into the
open spot on the breaker escutcheon (Item 2).
7.
Assemble the breaker (purchased separately) onto
the breaker barrier assembly and secure it using the
#10-32 x 3/8” SEMS screws (Item 7).
12. For main breaker applications, apply the
“MAIN” label (Item 3) to the breaker escutcheon
as shown.
13. Before energizing the panel, ensure that all
connections have been properly torqued,
the deadfront is installed and all fillers are
in place.
14. Follow Steps 1 through 11, except that the kit
must be installed at the feed-thru or subfeed end
of the panel and any pre-existing assembly at
that location must be removed prior to installation
of this kit. In addition, do NOT install the “MAIN”
label (skip Step 12). Finish with Step 13.
For installation as a main breaker:
For installation as a subfeed breaker:
(For panels with feed-thru or subfeed space ONLY)
1. Lock off all power supplying this
equipment before working on it.
3. Remove the lugs (if installed).
2. Remove the deadfront.
(For 250A panels ONLY)
MAIN
END
FEED-THRU
OR SUBFEED
END
P1-400 PANELBOARD WITH SUBFEED BREAKER
STRAP AND BARRIER ASSEMBLY 1
BREAKER ESCUTCHEON
MAIN LABEL
NEUTRAL LUG ASSEMBLY
1/4”-20 x 1/2” HEX HEAD SEMS* ASSEMBLY SCREW
#10-24 x 7/16” SLOTTED HEX WASHER THREAD-FORMING SCREW
** (2) for 1Ø, (3) for 3Ø
1
***
2
1
1
1
2
3
4
5
6
7
#10-32 x 3/8” HEX HEAD SEMS* ASSEMBLY SCREW
**
8
9
* SEMS assembly screws have a captive washer on the screw
THIS KIT CONTAINS THE FOLLOWING ITEMS:
ITEM QTY
DESCRIPTION
N/A
N/A
30 lb-in
N/A
N/A
TORQUE
lb-in
20 lb-in
1
BL / BQD BREAKER SUPPORT BRACKET N/A
1
1” BLANK FILLER N/A
3-PHASE
P1-250
*** (3) for 1Ø, (4) for 3Ø
**** 72 lb-in for Strap to Bus connections; but ONLY 40 lb-in for plastic breaker bracket to plastic barrier connection
****
(3VA4 shown)
DEADFRONT
MAIN
END
FEED-THRU
OR
SUBFEED
END
3
1
9
5
2
5
DEADFRONT
SUPPORT
BASE
RAIL
NEUTRAL
LUG PAD
NEUTRAL
CROSS BUS
6
7
4
Breaker Support Bracket
assembled to
Strap and Barrier Assembly
How to
Assemble
Fig. 1
Fig. 2 Fig. 3
Fig. 4
81
5
BARRIER HOOK HOLES
BRACKET
HOOKS