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Square D Q221150BC Molded Case Circuit Breaker
- 150A
- 2 Pole
- I-Line
Square D
Q221150BC
Molded Case Circuit Breaker
Brand
Square D
SKU
Q221150BC
Quantity
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Square D Q221150BC - 150A 2 Pole Molded Case Circuit Breaker
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Description
Utilizing a dedicated B-C phase jaw, this 150-amp molded case circuit breaker facilitates proper load distribution across commercial electrical systems. It integrates smoothly into Square D I-Line panelboards, offering reliable thermal-magnetic trip functions for standard applications. While eventually replaced by the PowerPact QBA22150 model, this legacy Q2 frame maintains a 10kA short circuit current rating and includes the highly visible Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | Q221150BC |
| Series | Q2 |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line 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 | I-Line Phase Connection (B-C) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Visual Trip Indicator, HACR Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhat does the BC suffix indicate on the Q221150BC catalog number?
The BC designates the specific phase connection for the I-Line bus. This breaker is configured to connect to the B and C phases, allowing panel builders to properly balance the load across the electrical system.
What is the current replacement for the legacy Q221150BC circuit breaker?
The Q221150BC is a legacy Q2 frame breaker that has been superseded by the Square D PowerPact Q-Frame series. The direct modern replacement is the QBA22150, which maintains the same 150A rating and 2-pole I-Line configuration.
Can I install the Q221150BC in a standard Square D QO load center?
No, this breaker is specifically designed for Square D I-Line panelboards and switchboards. It uses a specialized plug-on I-Line connection that is not compatible with standard QO or Homeline residential load centers.
How is the Q221150BC secured to the panelboard bus?
It utilizes the Square D I-Line plug-on mounting system. The breaker jaws push directly onto the panelboard bus stack, requiring no additional bolt-on hardware or cable connections for the line side.
Are the thermal and magnetic trip functions adjustable on this breaker?
No, the Q221150BC features a fixed thermal-magnetic trip unit. The long-time and instantaneous trip settings are factory calibrated and cannot be adjusted in the field.
Does this breaker provide a visual indication when it trips?
Yes, it includes the Square D Visi-Trip feature. When a fault causes the breaker to trip, a bright red indicator appears in the window, allowing electricians to quickly identify the tripped breaker in a crowded panel.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 7 reviews.
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Rating
7 reviews
- MEMichael E.Verified BuyerReviewingSquare D Q221150AC - 150A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/28/26breaker purchase
delivered on time and quality was as advertised
- MWmakalita w.Verified BuyerReviewingSquare D Q232150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/18/26Prompt service.
Well packaged
- AWAllen W.ReviewingSquare D Q232175 - 175A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/17/22Great condition
The breakers were in great condition. The serve was also great.
- JCJim C.ReviewingSquare D Q232200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/13/22Great Service
My order was received fast. The packaging was perfect. The quality of the product was what was expected.
- RDRosemarie D.ReviewingSquare D Q232150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/1/20home
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