ABB / General Electric THQD32125ST1 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Unit Mount
Quantity
ABB / General Electric THQD32125ST1 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for industrial power distribution, the GE THQD32125ST1 is a 3-pole, 125A molded case circuit breaker. It utilizes fixed thermal and magnetic trip elements to deliver reliable LI overcurrent protection. This unit-mount breaker is compatible with GE A-Series panelboards and includes factory-installed line and load lugs. Rated for 22 kAIC at 240VAC, this specific model includes a 120VAC shunt trip accessory for remote operation.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THQD32125ST1 |
| Series | THQD |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 120VAC, 240VAC, 120/240VAC |
| Phase | 3 |
| AIC Rating | 22kA @ 120VAC, 22kA @ 240VAC, 22kA @ 120/240VAC |
| Frame Type | TQD |
|---|---|
| Terminal Type | Lugs |
| For Use With | GE A-Series Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil (Cu/Al) |
| 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch, Lockout Attachment |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB 1 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, High Interrupting Capacity, Reverse Feed, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
7 answersWhat panelboards are compatible with the THQD32125ST1 circuit breaker?
This unit mount breaker is designed for installation in GE A-Series panelboards, Spectra Series panelboards, GE meter stacks, and compatible standalone enclosures.
What does the ST1 suffix mean on the THQD32125ST1 catalog number?
The ST1 suffix indicates that this circuit breaker is factory-equipped with a 120V shunt trip accessory. This allows the breaker to be tripped remotely by applying a 120V AC control signal, which is commonly used for emergency power-off (EPO) applications.
Is the THQD32125ST1 manufactured by ABB or General Electric?
ABB acquired GE Industrial Solutions in 2018. Circuit breakers in the Q-Line family continue to be manufactured under the exact same catalog numbers. You may receive stock branded as GE, ABB, or GE by ABB, but they are identical in fit, form, and function.
How does a feed-thru unit mount breaker like the THQD32125ST1 connect to the system?
Unlike plug-in or bolt-on branch breakers that connect directly to a panel busbar, this feed-thru breaker mounts independently to the chassis or backpan. It requires physical wire connections at both the line and load lugs to complete the circuit.
Are the trip settings on the THQD32125ST1 adjustable?
No. This breaker features a fixed thermal-magnetic trip unit. Both the long-time (overload) and instantaneous (short-circuit) trip functions are factory-calibrated and cannot be modified in the field.
What is the proper wire preparation for the lugs on this breaker?
The factory-installed lugs accept copper or aluminum conductors from 4 AWG to 300 kcmil. Electricians should apply an appropriate oxide-inhibiting joint compound when terminating aluminum wire and torque all connections to the specifications printed directly on the breaker faceplate.
Is the THQD32125ST1 suitable for reverse feed applications?
Yes, standard THQD thermal-magnetic circuit breakers are suitable for reverse feed. This allows the breaker to be back-fed when utilized as a main breaker or in specific generator transfer configurations.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 9 reviews.
- JRJeffrey R.Verified BuyerReviewingABB / General Electric THQD32200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/29/26200A 3 Pole breaker
Breaker was in good shape and in good working order.
- APAlex P.Verified BuyerReviewingABB / General Electric THQD32200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Great Service
Provided exactly what I needed
- RDRob D.Verified BuyerReviewingABB / General Electric THQD32225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/10/26Happy Customer
Sean assisted us on this difficult order, and got it all correct. The price was good and the order received within 5 days on a tricky order! Thank you, Sean!
- RGRonald G.Verified BuyerReviewingABB / General Electric THQD32225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/18/25Breaker purchase
The breaker I purchased was in great condition, delivered quickly. This kind of service allows me to make people happy. That’s the goal!
- GMGloria M.ReviewingABB / General Electric THQD32150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/29/23Exactly what I needed and
Exactly what I needed and showed up quick