Siemens B212500S01 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Quantity
Siemens B212500S01 - 125A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial power distribution, the Siemens B212500S01 is a 2-pole, 125A BL series molded case circuit breaker. It provides reliable thermal-magnetic overcurrent protection for demanding branch circuits. This bolt-on MCCB installs into Siemens P1 through P5 panelboards. The bolted connection ensures stable performance in continuous-duty applications. Rated at 10kAIC at 120/240VAC, this breaker includes a factory-installed 120VAC shunt trip for remote tripping capabilities.Specifications
| Brand | Siemens |
|---|---|
| Series | BL |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 2-1/0 AWG (Cu), 1/0-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 2 AWG (Cu), 1/0 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Shunt Trip 120VAC (Factory Installed) |
| Standards | CSA C22.2 No. 5, UL 489, HACR Rated |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
6 answersWhat does the 00S01 suffix indicate on the B212500S01 catalog number?
The 00S01 suffix designates a factory-installed 120VAC shunt trip. This allows the breaker to be opened remotely via a 120V control signal, which is commonly used for emergency stops or automated shutdown systems.
Is the B212500S01 interchangeable with a standard B2125 breaker?
Both share the same 125A, 2-pole BL series bolt-on frame, but the B212500S01 includes a factory-installed 120V shunt trip. If your application does not require remote tripping, a standard B2125 can be used.
Which Siemens panelboards accept the B212500S01 circuit breaker?
This BL-frame bolt-on breaker is compatible with Siemens P1, P2, P3, P4, and P5 commercial panelboards.
Can I install the B212500S01 in a residential load center?
No. This is a bolt-on circuit breaker designed specifically for commercial panelboards. It will not fit in load centers that require plug-on connections.
How is the shunt trip wired on this breaker?
The factory-installed shunt trip features pigtail leads that exit the breaker housing. These leads must be spliced into a separate 120VAC control circuit to enable the remote tripping functionality.
What safety procedures apply when installing a breaker with a shunt trip?
Both the primary panelboard bus and the separate 120VAC control circuit powering the shunt trip must be fully de-energized before installation or maintenance. Lockout-tagout procedures should be followed for all power sources.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 35 reviews.
- TSTom S.Verified BuyerReviewingSiemens B3100 3 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Superbreakers is our go to!
Great prices, great service and quick delivery.
- MGMaggie G.Verified BuyerReviewingSiemens B250 - 50A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/24/26Great Service
Came in great condition and in an incredibly timely manner. Will continue superbreakers for all of my orders in the future!
- DBDonnie B.Verified BuyerReviewingSiemens B115 - 15A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26New Breaker
Awesome breaker & Superbreakers is a awesome company!
- BLBrian L.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Brian
Works great
- JFJoseph F.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/23/26Great value
It was a great value