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Square D Q2M3150MB Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Square D
Q2M3150MB
Molded Case Circuit Breaker
Brand
Square D
SKU
Q2M3150MB
Quantity
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Square D Q2M3150MB - 150A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D Q2M3150MB - 150A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | Q2M3150MB-R |
| Series | Q2M |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D QO Load Centers, NQO Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, Main Breaker |
Quantity
Square D Q2M3150MB - 150A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | Q2M3150MB-R |
| Series | Q2M |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D QO Load Centers, NQO Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, Main Breaker |
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Description
Serving as a reliable main breaker, the Square D Q2M3150MB is a 150A, three-pole molded case circuit breaker. It provides essential thermal-magnetic protection for residential and commercial electrical systems operating at 240VAC. This bolt-on unit is specifically designed to fit Square D NQO panelboards and QO load centers. For modern panel upgrades, this legacy breaker is officially replaced by the QBP32150TP. Rated at 10kAIC, it features a Visi-Trip indicator for fast fault identification.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q2M3150MB-R |
| Series | Q2M |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D QO Load Centers, NQO Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Al/Cu) |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, Main Breaker |
Product FAQs
6 answersWhat panelboards are compatible with the Square D Q2M3150MB?
This 3-pole main breaker is specifically designed to bolt into legacy Square D NQO panelboards and QO load centers.
What is the modern replacement for the legacy Q2M3150MB breaker?
For modern panel upgrades or when replacing this legacy unit, the Square D PowerPact Q-frame QBP32150TP serves as the official direct replacement.
What wire sizes are accepted by the terminals on the Q2M3150MB?
The factory-installed lugs accommodate 4 AWG to 300 kcmil aluminum or copper conductors.
What type of protection does the LI trip function provide?
The LI designation means this thermal-magnetic breaker provides Long-Time (L) protection for sustained overloads and Instantaneous (I) protection for short circuits. Both the thermal and magnetic trip points are fixed.
How does the Q2M3150MB mount into the panel?
It utilizes a bolt-on connection, securing directly to the panelboard busbar. This provides a robust, high-contact connection suitable for 150A main breaker applications.
How can I easily identify if the Q2M3150MB has tripped?
This breaker features a Visi-Trip visual indicator. When a fault occurs and the breaker trips, the indicator provides a clear visual cue for fast fault identification in the panel.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
1 review
- VGVern G.Verified BuyerReviewingSquare D Q2M3200MT - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/4/26Good breaker. No problems. Direct replacement.
Superbreakers was great to work with. The salesman checked and didn't have the breaker I was looking for, but found one at another location, had it shipped to me next day air, and it worked out great. Glad to see this type of customer service. I will call on them again when needed.