ABB / General Electric THJ4V2603 Molded Case Circuit Breaker
- 300A
- 3 Pole
- Unit Mount
Quantity
ABB / General Electric THJ4V2603 - 300A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for heavy-duty industrial applications, this 300A GE molded case circuit breaker delivers robust electrical protection. It mounts into legacy GE J-Frame enclosures and motor control centers, and can be substituted with a Tmax XT5 via retrofit kit. The breaker utilizes a Power+ 4 electronic trip unit with adjustable LI functions, providing a 65kAIC rating at 240VAC and interchangeable rating plugs for maximum system flexibility.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THJ4V2603-R |
| Series | THJ |
| Amperage | 300A |
| 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 | (1) 6 AWG-600 kcmil (Cu/Al) or (2) 2/0 AWG-250 kcmil (Cu/Al) |
| Max Wire | 600 kcmil (Single) or 250 kcmil (Double) |
| Min Wire | 6 AWG (Single) or 2/0 AWG (Double) |
| Trip Technology | Electronic Trip |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Standard Lugs (Kit TCAL43) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Power+ 4 Trip Unit, Current Limiting, Interchangeable Rating Plug, Adjustable Trip, High Interrupting Capacity |
Product FAQs
8 answersWhat enclosures and panels accept the THJ4V2603 breaker?
This unit-mount breaker is designed for installation in legacy GE J-Frame enclosures, switchboards, and motor control centers.
What is the modern replacement for the legacy THJ4V2603?
The THJ4V2603 can be substituted with an ABB Tmax XT5 molded case circuit breaker using a dedicated retrofit kit. This allows you to upgrade the breaker while preserving the existing panel infrastructure.
What trip functions are adjustable on the Power+ 4 trip unit?
The LI (Long-Time, Instantaneous) configuration on this electronic trip unit features adjustable long-time pickup and delay, as well as an adjustable instantaneous pickup. It also includes a long-time pickup light for visual status indication.
Which lugs are standard for the 300A THJ4V2603?
For the 300A sensor rating, the standard factory lugs are catalog number TCAL43. These accept either one 6 AWG to 600 kcmil conductor or two 2/0 AWG to 250 kcmil conductors (copper or aluminum).
Can the THJ4V2603 be used in single-phase systems?
Yes. When applying this 3-pole J-Frame breaker in a single-phase application, GE specifications require wiring the load through the outer two poles.
Is the THJ4V2603 suitable for reverse-feed applications?
Yes, GE J-Frame breakers equipped with the Power+ 4 trip unit are standard reverse-feed capable, allowing line connections on either the upper or lower terminals.
How can I mechanically test the trip mechanism on this breaker?
The breaker features a built-in "Push to Trip" button on the front face. Pressing this button exercises the internal mechanical linkages to verify the trip mechanism is functioning properly during routine maintenance.
What is the maximum frame size for the THJ4V2603?
Although this specific model is equipped with a 300A sensor and rating plug, it is built on the GE THJ4V J-Frame, which has a maximum capacity of 600 amps.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.