ABB / General ElectricTHFK236150
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ABB / General Electric THFK236125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
ABB / General Electric
THFK236125
Molded Case Circuit Breaker
Brand
ABB / General Electric
SKU
THFK236125
Quantity
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ABB / General Electric THFK236125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for older GE systems, the THFK236125 is a 125A, 3-pole molded case circuit breaker. It utilizes proven thermal-magnetic trip technology to safeguard circuits against overloads. The unit is built for bolt-on installation in A-Series panelboards. Equipped with an interchangeable trip unit, this F-Frame MCCB offers 25 kAIC at 480VAC. While replaced by the XT3 line for new builds, this exact match ensures existing switchgear remains operational.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THFK236125-R |
| Series | THFK |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 25kA @ 480VAC, 18kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | GE A-Series Panelboards, Switchboards, Motor Control Centers |
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Lug Kits |
|---|---|
| Accessories | Load Side Lugs Included (TCAL24) |
| Standards | CSA C22.2 No. 5, HACR Rated, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit, High Interrupting Capacity, Trip-Free Mechanism, Common Trip |
Product FAQs
8 answersWhat panels and equipment is the THFK236125 compatible with?
This breaker is designed for use in legacy GE A-Series panelboards, switchboards, and motor control centers. It serves as a direct drop-in replacement for existing F-Frame infrastructure.
What lug kit is used with the THFK236125 breaker?
This breaker typically uses the TCAL24 lug kit for line and load connections, which accepts 4 AWG to 300 kcmil copper or aluminum wire.
What does the LI trip function code indicate on the THFK236125?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) protection against overloads and Instantaneous (I) protection against short circuits. The thermal element is fixed, while the magnetic element is adjustable for precise coordination.
Is the THFK236125 still manufactured, or is there a modern replacement?
The THFK series is a legacy GE F-Frame breaker. While ABB has introduced the Tmax XT3 series for new installations, the THFK236125 remains available as an exact-match replacement to keep existing GE switchgear operational without requiring retrofit kits.
Can I use aluminum wire with this circuit breaker?
Yes, the standard lugs on the THFK236125 are dual-rated for both copper (Cu) and aluminum (Al) conductors, accommodating wire sizes from 4 AWG up to 300 kcmil.
Does the THFK236125 support field-installable accessories?
Yes, this F-Frame breaker supports various internal accessories, including shunt trips, auxiliary switches, undervoltage releases, and alarm switches. These allow for remote tripping and system status monitoring.
What is the magnetic trip adjustment range for this 125A breaker?
The instantaneous magnetic trip on the 125A THFK236125 can typically be adjusted between 600A and 1250A. This allows panel builders to coordinate the breaker with downstream devices and prevent nuisance tripping.
How does the THFK236125 mount into a panelboard?
This is a bolt-on circuit breaker. It secures directly to the busbar using bolted connections, providing a highly reliable, high-amperage termination suitable for heavy-duty industrial environments.
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