ABB / General Electric THJ9VF26 Molded Case Circuit Breaker
- 600A
- 3 Pole
- Unit Mount
Quantity
ABB / General Electric THJ9VF26 - 600A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Built for demanding commercial environments, the THJ9VF26 provides comprehensive 600A power distribution control. This unit mount MCCB installs into GE J-Frame enclosures, switchboards, and motor control centers, with an upgrade path to the Tmax XT5 using a retrofit kit. It features the advanced MicroVersaTrip RMS-9 electronic trip unit, offering fully adjustable LSIG protection at 65kAIC (240V), and includes load side lugs for convenient termination.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THJ9VF26 |
| Series | THJ |
| Amperage | 600A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | GE J-Frame Enclosures, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 4/0 AWG-350 kcmil (Cu) or (2) 300-500 kcmil (Al) |
| Max Wire | 350 kcmil (Cu) / 500 kcmil (Al) |
| Min Wire | 4/0 AWG (Cu) / 300 kcmil (Al) |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | MicroVersaTrip RMS-9 Trip Unit, Current Limiting, Interchangeable Rating Plug, Adjustable Trip, High Interrupting Capacity |
Product FAQs
8 answersWhy is this breaker listed under both ABB and General Electric?
General Electric's Industrial Solutions division was acquired by ABB in 2018. Legacy GE molded case circuit breakers, including the THJ series and Micro Versa Trip family, are now managed and supported under the ABB brand portfolio.
What is the difference between the 600A frame and the 300A sensor rating on this breaker?
The THJ9VF26 utilizes a 600A maximum J-Frame footprint, but this specific configuration is equipped with a 300A current sensor. This means the breaker provides overload protection based on a 300A continuous current rating while maintaining the physical dimensions and short-circuit withstand capabilities of a 600A frame.
What protection functions are included in the LSIG Micro Versa Trip unit?
The LSIG electronic trip unit provides fully adjustable protection for Long-Time (overload), Short-Time (short circuit delay for system coordination), Instantaneous (immediate short circuit clearing), and Ground-Fault (equipment protection against ground leakage currents).
What wire sizes are accepted by the lugs on the THJ9VF26?
The factory lugs are designed to accept dual conductors per phase. They accommodate two 4/0 AWG to 350 kcmil copper wires, or two 300 kcmil to 500 kcmil aluminum wires.
What types of equipment is the THJ9VF26 compatible with?
This bolt-on J-Frame breaker is designed for installation in legacy General Electric J-Frame enclosures, commercial switchboards, and motor control centers (MCCs).
Can the continuous current rating of this breaker be adjusted?
Yes, the Micro Versa Trip unit uses interchangeable rating plugs. Because this breaker is equipped with 300A current sensors, you can install compatible GE rating plugs keyed for a 300A sensor to lower the continuous current rating below 300A if required by your application.
What is the purpose of the ground fault delay function on this breaker?
The ground fault delay allows for selective coordination in your electrical system. By delaying the trip response to a ground fault, downstream breakers closer to the fault have time to clear the issue, preventing a complete system outage at the main or feeder level.
How does the unit mount connection work for the THJ9VF26?
As a unit mount breaker, the THJ9VF26 bolts directly to the panel bus or mounting pan. This provides a secure, high-capacity connection suitable for heavy industrial loads, unlike standard plug-in designs.
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