ABB / General ElectricTHLC436400
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ABB / General Electric THLC434400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Bolt-On
ABB / General Electric
THLC434400
Molded Case Circuit Breaker
Brand
ABB / General Electric
SKU
THLC434400
Quantity
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ABB / General Electric THLC434400 - 400A 3 Pole Molded Case Circuit Breaker
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Description
Capable of restricting let-through energy, this 400A current-limiting MCCB protects downstream equipment during severe faults. Rated for 200 kAIC at 480V, the THLC434400 delivers exceptional interrupting capacity for commercial electrical systems. This 3-pole thermal-magnetic breaker features fixed trip settings and a trip-free mechanism. The bolt-on design installs into GE Spectra Series panelboards, A-Series panelboards, switchboards, and motor control centers.Specifications
| Brand | ABB / General Electric |
|---|---|
| Part Number | THLC434400-R |
| Series | THLC |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | GE Spectra Series Panelboards, GE A-Series Panelboards, GE Switchboards, Motor Control Centers |
| Wire Gauge | 3/0 AWG - 500 kcmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, High Interrupting Capacity, Non-Interchangeable Trip, Trip-Free Mechanism, Common Trip |
| Special Features | Current Limiting |
Product FAQs
7 answersWhich panelboards and switchboards are compatible with the THLC434400 circuit breaker?
This bolt-on breaker is designed for installation in GE Spectra Series Panelboards, GE A-Series Panelboards, GE Switchboards, and Motor Control Centers.
What does the current limiting designation mean for the THLC434400?
As a current-limiting breaker, it is engineered to rapidly clear high-level short circuits. This restricts let-through energy to protect downstream equipment from severe fault damage, supported by its 200kAIC interrupting capacity at 480V.
What wire sizes and materials are accepted by the lugs on this breaker?
The terminal lugs accept wire gauges from 3/0 AWG up to 500 kcmil. They are rated for use with both copper and aluminum conductors.
Is the trip unit on the THLC434400 interchangeable?
No, this breaker features a non-interchangeable thermal magnetic trip unit with fixed thermal and fixed magnetic settings. It provides standard Long-Time and Instantaneous (LI) protection functions.
What frame type does the THLC434400 belong to?
It is part of the GE THLC4 frame, which is an unfused, current-limiting molded case circuit breaker frame designed for heavy commercial and industrial applications.
Why is this breaker listed under both ABB and General Electric?
ABB acquired GE Industrial Solutions in 2018. Depending on the manufacturing date, this exact breaker may feature either ABB or GE branding on the label, but the physical dimensions, mounting, and electrical specifications remain identical.
What are the primary safety considerations when installing this 400A bolt-on breaker?
Installation must be performed by a qualified electrician. Ensure the panelboard or switchboard is completely de-energized before bolting the breaker to the busbars. Conductors must be properly torqued within the 3/0 AWG to 500 kcmil range to prevent arcing or thermal failure.
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