SIEMENS MBKVA41A xGB Main or Subfeed Breaker Kit for P1-250 Panelboard Instruction Manual
- June 10, 2024
- SIEMENS
Table of Contents
SIEMENS MBKVA41A xGB Main or Subfeed Breaker Kit for P1-250 Panelboard
Product Information
MBKVA41A or MBKVA41B BL / BQD / xGB / 3VA4 Main / Subfeed Breaker Kit for P1-250 Panelboard (or P1-400 Subfeed)
The MBKVA41A or MBKVA41B breaker kit is designed to be used in Revised P1 Panelboards ONLY. It includes a strap and barrier assembly, breaker escutcheon, main label, neutral lug assembly, screws, breaker support bracket, and blank filler. The kit is compatible with BL/BQD or xGB/3VA4 breaker types.
Product Usage Instructions
WARNING
Hazardous voltage. Will cause death or serious injury. Keep out. Qualified personnel only. Disconnect and lock off all power before working on this equipment.
-
Lock off all power supplying this equipment before working on it.
-
Remove the deadfront.
-
If installing as a main breaker for 250A panels, remove the lugs (if installed).
-
Prepare the kit based on the breaker type:
-
For BL/BQD breakers: Position the breaker support bracket onto the breaker barrier assembly by swinging the hooks on the bottom of the bracket into the proper holes on the breaker barrier assembly.
Complete assembly by inserting a 1/4-20 screw. Torque to 40 lb-in. -
For xGB/3VA4 breakers: Proceed to Step 5.
-
-
Position the breaker barrier assembly at the MAIN END of the panel. 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. Do not tighten at this time.
-
Secure the breaker barrier assembly to the base rails with two #10-24 screws. Do not tighten at this time.
-
Assemble the breaker (purchased separately) onto the breaker barrier assembly and secure it using the #10-32 x 3/8 SEMS screws.
-
On 1-phase 3-wire and 3-phase 4-wire systems, the neutral lug assembly is required. 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). -
Torque all connections to the values specified on the Hardware Tightening Torque label affixed to the rear of the deadfront.
-
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.
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)
THIS KIT CONTAINS THE FOLLOWING ITEMS:
| ITEM | DESCRIPTION | QTY | TORQUE |
|---|---|---|---|
| 1 | STRAP AND BARRIER ASSEMBLY | 1 | N/A |
| 2 | BREAKER ESCUTCHEON | 1 | N/A |
| 3 | MAIN LABEL | 1 | N/A |
| 4 | NEUTRAL LUG ASSEMBLY | 1 | N/A |
| 5 | 1/4”-20 x 1/2” HEX HEAD SEMS* ASSEMBLY SCREW | *** | **** lb-in |
| 6 | #10-24 x 7/16” SLOTTED HEX WASHER THREAD-FORMING SCREW | 2 | 30 lb-in |
| 7 | #10-32 x 3/8” HEX HEAD SEMS* ASSEMBLY SCREW | ** | 20 lb-in |
| 8 | BL / BQD BREAKER SUPPORT BRACKET | 1 | N/A |
| 9 | 1” BLANK FILLER | 1 | N/A |
- SEMS assembly screws have a captive washer on the screw
- (2) for 1Ø, (3) for 3Ø
- (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
Installation Instructions
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.
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.
-
Lock off all power supplying this equipment before working on it.
-
Remove the deadfront.
For installation as a main breaker:
(For 250A panels ONLY) -
Remove the lugs (if installed).
-
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. **** -
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.
-
Secure the breaker barrier assembly to the base rails with two #10-24 screws (Item 6). Do not tighten at this time.
-
Assemble the breaker (purchased separately) onto the breaker barrier assembly and secure it using the #10-32 x 3/8” SEMS screws (Item 7).
-
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).
-
Torque all connections to the values specified on the Hardware Tightening Torque label affixed to the rear of the deadfront.
-
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.
-
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). -
For main breaker applications, apply the
“MAIN” label (Item 3) to the breaker escutcheon as shown. -
Before energizing the panel, ensure that all connections have been properly torqued, the deadfront is installed and all fillers are in place.
For installation as a subfeed breaker:
(For panels with feed-thru or subfeed space ONLY) -
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.
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.
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