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Square D QBM32125TN Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Square D
QBM32125TN
Molded Case Circuit Breaker
Brand
Square D
SKU
QBM32125TN
Quantity
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Square D QBM32125TN - 125A 3 Pole Molded Case Circuit Breaker
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Description
Delivering 125A of continuous current capacity, the Square D QBM32125TN is a 3-pole PowerPacT Q-Frame molded case circuit breaker. It is engineered for commercial and industrial 240VAC electrical systems. This unit mount breaker fastens securely into NQ panelboards, NQOD panelboards, and switchboards. It serves as an exact substitute for the legacy Q2M3125MT. Equipped with a fixed thermal-magnetic trip unit, it provides standard LI protection at 10kAIC and includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | QBM32125TN |
| Series | QBM |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 208Y/120VAC, 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 208Y/120VAC, 10kA @ 240VAC |
| Frame Type | QBM |
|---|---|
| Terminal Type | Stud/Tapped Pad |
| For Use With | NQ Panelboards, NQOD Panelboards, Switchboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Terminal Nut Kit (Load Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Visual Trip Indicator, Non-Interchangeable Trip, Main Breaker |
Product FAQs
7 answersWhich panelboards are compatible with the QBM32125TN circuit breaker?
This 3-pole breaker is designed for use in Square D NQ and NQOD panelboards, as well as compatible switchboards. It features a unit-mount, bolt-on connection and is not compatible with I-Line or plug-on load centers.
What does the TN suffix indicate on the QBM32125TN?
The TN suffix indicates that the breaker is equipped with factory-installed studs on the load side (OFF end) and lugs on the line side (ON end), rather than standard mechanical lugs on both ends. This configuration is designed for specialized terminal connections.
What wire sizes are accepted by the terminals on the QBM32125TN?
The breaker accepts aluminum or copper wiring ranging from 4 AWG up to 300 kcmil.
Are the trip settings adjustable on the QBM32125TN?
No, this thermal-magnetic breaker features fixed long-time and fixed instantaneous (LI) trip functions. The trip thresholds cannot be adjusted in the field.
How does the QBM32125TN connect to the panelboard bus?
It features a bolt-on connection type and is designed for unit mounting within the panelboard or switchboard. It does not snap or plug onto the bus.
Does the QBM32125TN feature a push-to-trip button for testing?
Yes, PowerPacT Q-frame breakers include an integral push-to-trip button on the cover. This allows you to manually trip the breaker to verify the mechanical operation of the trip mechanism.
Is the QBM32125TN suitable for use with heating, air conditioning, and refrigeration equipment?
Yes, this PowerPacT Q-frame breaker is HACR rated, making it suitable for protecting HVAC and refrigeration circuits.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 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
2 reviews
- MPMichael P.Verified BuyerReviewingSquare D QBM32200TN - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/14/26Owner…..Payne Electric
Got exactly what I ordered.
- TMTony M.Verified BuyerRated 5 out of 5 stars12/12/25Square D circuit breakers
As always, I order circuit breakers from super breakers and I receive my order the very next day. Great service, very dependable. !
Also there prices are great .
Tony