⚡ Breakthrough power meets seamless safety — don’t get left in the dark!
The Siemens MBK125A is a 125-Amp bolt-on main circuit breaker designed exclusively for Ultimate type load centers. UL listed for safety and reliability, it offers a compact, easy-to-install solution that ensures your electrical system runs smoothly and securely, backed by Siemens’ strict warranty policies.
| Brand | Siemens Energy Automation Inc |
| Current Rating | 125 Amps |
| Circuit Breaker Type | Standard |
| Mounting Type | Bolt-On Mount |
| Number Of Poles | 3 |
| UPC | 783643388000 |
| Manufacturer | Siemens |
| Global Trade Identification Number | 00783643388000 |
| Part Number | GID-156232 |
| Item Weight | 12.8 ounces |
| Product Dimensions | 3.7 x 4.5 x 5.6 inches |
| Item model number | MBK125A |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | Siemens strongly recommends against the use of "used" breakers. The installation of used breakers in a Siemens panel will void the warranty on the panel. Siemens does not sell used breakers and has not approved any 3rd party sellers to do so. |
G**.
Perfect replacement
Had a main breaker for a clients panel drop a leg of power and the local supply house did not have any in stock. Shipping was fast and breaker arrived with no damage. Direct swap and got the customers power back. Make sure to match up the breaker part number and what style the panel uses.
B**Y
Fits perfectly
This worked perfectly for my clients breaker box it’s just what we needed
R**O
Works as intended
Works perfectly
B**S
For sub panel.
Installed in detached garage sub panel.
M**K
Very happy with product
Very happy with product
L**A
Just what the electrician orderec
Perfect for electrical
L**R
"Ultimate" conversion from Main Lug to Main Breaker
This unit fit perfectly into my Siemens 125 amp Main Lug PL Series Load Center. Quick to install and great price.
P**G
Easy to install, convert main lug panel to main breaker panel
Really easy to install. The lugs on the breaker take a slotted screwdriver as opposed to hex bolts, unfortunately.
Trustpilot
1 week ago
3 weeks ago
