ABB / General Electric THJK436250 Molded Case Circuit Breaker
- 250A
- 3 Pole
- Unit Mount
Quantity
ABB / General Electric THJK436250 - 250A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A reliable solution for power distribution, the GE THJK436250 is a 3-pole, 250A molded case circuit breaker. It features an interchangeable trip unit and provides long-time and instantaneous protection. Designed as a unit-mount device, it integrates smoothly into GE J600 series enclosures and legacy switchgear. Terminal lugs are not included, allowing contractors to select appropriate TCAL43 kits. Rated 65kAIC at 240VAC, it ensures superior safety for commercial applications.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THJK436250 |
| Series | THJK |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 40kA @ 250VDC, 20kA @ 500VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | GE J600 Series Enclosures, Switchboards, Motor Control Centers |
| Wire Gauge | (1) 6 AWG - 600 kcmil (Cu/Al) or (2) 2/0 AWG - 250 kcmil (Cu/Al) |
| Max Wire | 600 kcmil |
| Min Wire | 6 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 | Lugs Sold Separately (TCAL43) |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
7 answersWhat enclosures are compatible with the THJK436250?
This breaker is designed for use in GE J600 series enclosures, as well as compatible GE switchboards and motor control centers. It utilizes a standard bolt-on unit mount configuration.
What are the lug wire size capacities for this breaker?
The factory lugs accept either a single copper or aluminum conductor from 6 AWG to 600 kcmil, or dual conductors from 2/0 AWG to 250 kcmil. This dual-wire capability is ideal for parallel feeds in tight panel spaces.
How does the adjustable magnetic trip function work on this model?
While the thermal overload protection is fixed at 250 amps, the magnetic instantaneous short-circuit trip threshold can be adjusted. This allows electricians to coordinate the breaker with downstream devices or accommodate high inrush currents from motors.
Why is this breaker listed as both ABB and General Electric?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, the THJK436250 may feature either the GE or ABB logo, but both are identical in physical dimensions, mounting, and electrical performance.
Can the THJK436250 be used in DC electrical systems?
Yes, this thermal-magnetic breaker is rated for DC applications. It provides up to 40kA interrupting capacity at 250VDC and 20kA at 500VDC, making it suitable for battery backups, transit systems, or industrial DC drives.
What precautions should be taken when terminating aluminum wire to these lugs?
When using aluminum conductors, always apply a certified joint compound to the stripped wire before insertion. Ensure the lugs are torqued exactly to the specifications printed on the breaker faceplate to prevent thermal expansion issues.
Is this a plug-in or bolt-on breaker?
The THJK436250 is a unit mount, bolt-on circuit breaker. It requires bolted connections for both mounting and line side power, meaning it is not compatible with plug-in style panelboards.
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