Square D LH26400AC Molded Case Circuit Breaker
- 400A
- 2 Pole
- I-Line
Quantity
Square D LH26400AC - 400A 2 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed to handle demanding electrical loads, this 400-amp molded case circuit breaker offers reliable thermal-magnetic trip capabilities. It installs quickly into Square D I-Line panelboards using a specialized AC phase connection, making it ideal for commercial and industrial facilities. With a high interrupting rating of 65kAIC at 240VAC, the unit ensures robust system safety and can be replaced by LGA36400U31X models when utilizing the two outer poles.Specifications
| Brand | Square D |
|---|---|
| Part Number | LH26400AC |
| Series | LH |
| Amperage | 400A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | L |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (1) 1 AWG-600 kcmil (Al/Cu) or (2) 1 AWG-250 kcmil (Al/Cu) |
| Max Wire | 600 kcmil |
| Min Wire | 1 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Lugs (AL400LA) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Push-To-Trip, Phase Connection AC |
Product FAQs
7 answersWhat does the AC suffix mean in the LH26400AC catalog number?
The AC suffix indicates the phase connection. This 2-pole breaker is configured to connect to the A and C phases on the I-Line bus of Square D panelboards and switchboards.
Which panelboards are compatible with the LH26400AC?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features an I-Line style plug-in connection on the line side and mechanical lugs on the load side.
How do I adjust the trip settings on this breaker?
The LH26400AC features a thermal-magnetic trip unit with a fixed thermal element for long-time protection and an adjustable magnetic element for instantaneous protection. The magnetic trip can be adjusted between 2000A and 4000A using the dial on the front of the breaker.
Is the LH26400AC still manufactured, or is there a modern replacement?
The LH-frame is a legacy molded case circuit breaker. For modern installations, Schneider Electric replaces it with the PowerPacT L-frame series. When replacing a 2-pole legacy breaker with a modern 3-pole PowerPacT L-frame, the two outer poles are typically utilized.
Can this breaker be used in DC applications?
Yes, the LH26400AC is rated for use in DC systems up to 250VDC, where it provides an interrupting rating of 50kA.
What wire sizes are accepted by the load lugs on the LH26400AC?
The standard mechanical lugs accept either one conductor from 1 AWG to 600 kcmil or two conductors from 1 AWG to 250 kcmil. Both aluminum and copper wire are supported.
Does the LH26400AC provide ground fault protection?
No, this is a standard thermal-magnetic breaker providing long-time and instantaneous (LI) overcurrent and short-circuit protection. It does not include integrated ground fault (GFCI) or equipment protection (EPD) features.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
- MLMatthew L.Verified BuyerReviewingSquare D LH36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/21/26Super Breakers Does It Again!
New, in excellent condition, cheaper and faster than the competition
- MGMarkus G.Verified BuyerReviewingSquare D LH36400 - 400A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/4/25it states correctly what it was
Product as described