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Siemens Q2150B Molded Case Circuit Breaker
- 150A
- 2 Pole
- Plug-On
Siemens
Q2150B
Molded Case Circuit Breaker
Brand
Siemens
SKU
Q2150B
Quantity
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Siemens Q2150B - 150A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens Q2150B - 150A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q2150B |
| Series | Q |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Meter Combos |
| Wire Gauge | 1/0 AWG - 3/0 AWG (Cu/Al) |
| Max Wire | 3/0 AWG |
| Min Wire | 1/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, Reverse Feed, Main Breaker |
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Quantity
Siemens Q2150B - 150A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | Q2150B-R |
| Series | Q |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Meter Combos |
| Wire Gauge | 1/0 AWG - 3/0 AWG (Cu/Al) |
| Max Wire | 3/0 AWG |
| Min Wire | 1/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, Reverse Feed, Main Breaker |
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Description
Delivering 150A of overcurrent protection, this two-pole breaker is engineered for heavy-duty residential and commercial use. It functions effectively as a main breaker operating at 120/240VAC. The device mounts into compatible Siemens load centers and meter combos via a secure plug-on connection. It requires four panel spaces and accommodates 1/0 to 3/0 AWG wire. Equipped with a 10kAIC rating, the unit features a common trip mechanism, Insta-Wire connectors, and included load side lugs.Specifications
| Brand | Siemens |
|---|---|
| Part Number | Q2150B |
| Series | Q |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | Q |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Load Centers, Meter Combos |
| Wire Gauge | 1/0 AWG - 3/0 AWG (Cu/Al) |
| Max Wire | 3/0 AWG |
| Min Wire | 1/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip, Reverse Feed, Main Breaker |
Product FAQs
5 answersHow many panel spaces does the Q2150B require?
This breaker requires four full one-inch panel spaces. Because of its 150A capacity and physical size, it utilizes a cross-over design that occupies two adjacent spaces and two opposite spaces on the panel busbar.
Can this breaker be installed as a main breaker or a branch breaker?
This QP family breaker can serve as either a main breaker or a heavy-duty branch feeder, depending on your panel configuration. Always verify that your specific Siemens load center or meter combo is rated to accept a 150A breaker in the desired position.
Will the Q2150B fit in any Siemens residential panel?
No. While it features a standard plug-on connection, many residential load centers limit branch breaker capacities to 100A or 125A. You must check the interior wiring diagram of your panel to confirm it is approved to safely accept a 150A cross-over breaker.
Is there a higher interrupting capacity alternative for the Q2150B?
Yes. The Q2150B provides a standard 10kAIC rating. If your commercial application or local electrical codes require a 22kAIC short-circuit rating, you will need to source the Q2150BH circuit breaker instead.
How does the thermal magnetic trip mechanism protect electrical circuits?
The thermal component responds to gradual electrical overloads by heating a bimetallic strip, while the magnetic component provides an instantaneous trip during a severe short circuit. This dual-action design protects wiring insulation from heat damage and reduces the risk of electrical fires.
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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 47 reviews.
Reviews Summary
Generated by AI from 91 most recent customer reviews
Last updated 8/1/25
Customers say these circuit breakers arrive quickly and match their specifications perfectly. Many reviews mention success finding hard-to-locate specialty breakers through this supplier. Common feedback includes praise for the accurate product descriptions, reliable shipping, and competitive pricing. While some note occasional stock limitations, users consistently report the breakers fit and function as intended.
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Rating
47 reviews
- CGCrocefissa G.Verified BuyerReviewingSiemens Q115 - 15A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Quick delivery and great price.
The circuit breakers are at a great cost.
- JBJason B.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/26Great experience
The product was exactly what I needed and it arrived on time.
- DQDon Q.Verified BuyerReviewingSiemens Q3100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/14/26Siemens breaker
Great customer experience, great prices and fast shipping... Definitely will be buying her again.
- CSChristopher S.Verified BuyerRated 5 out of 5 stars8/12/26Siemens 60
Perfect new condition
- GSGeorge S.Verified BuyerReviewingSiemens Q2150B - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/4/26Great service
Every time I call or go online you have the parts I'm looking for.