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Siemens B280 Miniature Circuit Breaker
- 80A
- 2 Pole
- Bolt-On
Siemens
B280
Miniature Circuit Breaker
Brand
Siemens
SKU
B280
Quantity
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Siemens B280 - 80A 2 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens B280 - 80A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B280 |
| Series | BL |
| Amperage | 80A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
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Siemens B280 - 80A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B280-R |
| Series | BL |
| Amperage | 80A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
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Description
Designed for higher capacity circuits, the Siemens B280 is an 80-amp, two-pole miniature circuit breaker. Operating at 120/240VAC with a standard 10kAIC rating, it effectively safeguards residential, commercial, and industrial electrical systems. This Type BL breaker utilizes a secure bolt-on mounting mechanism to prevent loose connections over time. It offers broad compatibility, installing easily into Siemens P1, P2, P3, P4, and P5 panelboards as well as replacing older BAB2080 units.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B280 |
| Series | BL |
| Amperage | 80A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
7 answersWhat panelboards are compatible with the Siemens B280?
This breaker is designed exclusively for commercial Siemens P1, P2, P3, P4, and P5 panelboards. Because it is a bolt-on BL type, it is not compatible with standard residential load centers that require plug-on QP series breakers.
Does the Siemens B280 replace older ITE circuit breakers?
Yes. Because Siemens acquired ITE, the modern Siemens BL series serves as the direct replacement for legacy 80A, 2-pole ITE and Murray bolt-on breakers that share the exact same physical footprint and mounting style.
What size wire can the lugs on the B280 accommodate?
The factory load terminals accept 4 AWG to 1/0 AWG copper wire, or 2 AWG to 1/0 AWG aluminum wire. Installers should always verify that their chosen wire gauge meets the 80A circuit ampacity requirements defined by the National Electrical Code (NEC).
Is this breaker suitable for protecting HVAC equipment?
Yes, the B280 is HACR rated. This means it is fully tested and certified by UL for use with heating, air conditioning, and refrigeration systems that require a dedicated HACR-rated overcurrent device.
Can the B280 be used in 277V or 480V electrical systems?
No, this BL frame breaker is rated for a maximum of 120/240VAC. For systems operating at 480Y/277V, you will need to source a different breaker family entirely, such as the Siemens BQD series.
Are internal accessories available for the B280 breaker?
Yes, the BL series supports internal accessories like shunt trips, auxiliary switches, and alarm switches. However, these are factory-installed options and must be ordered as a pre-configured unit rather than added in the field by an electrician.
What happens if my system requires an interrupting rating higher than 10kAIC?
The standard B280 is limited to safely clearing a 10kA fault current at 120/240VAC. If your commercial installation has a higher available fault current, you must upgrade to the high-interrupting variants, such as the B280H rated for 22kAIC or the B280HH rated for 65kAIC.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 35 reviews.
Total 5 star reviews: 34 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
Reviews Summary
Generated by AI from 66 most recent customer reviews
Last updated 8/15/25
Customers say these circuit breakers meet their specifications and perform as expected. Many reviews highlight the quick delivery times and competitive pricing. Frequent comments address the reliable product quality and ease of installation. The ordering process receives praise for its simplicity, with users noting consistent product availability.
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Rating
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