Square D LH36175 Molded Case Circuit Breaker
- 175A
- 3 Pole
- I-Line
Quantity
Square D LH36175 - 175A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Utilizing a fixed thermal and adjustable magnetic trip, this 175-amp breaker delivers precise LI protection for industrial applications. It is engineered to mount into Square D I-Line panelboards without the need for the HNM1BL filler plate required by the modern JGA36175 replacement. The rugged L-Frame construction achieves a 65kA interrupting rating at 240VAC and 25kA at 600VAC. It features a push-to-trip mechanism for straightforward testing and accommodates dual 250 kcmil conductors.Specifications
| Brand | Square D |
|---|---|
| Part Number | LH36175 |
| Series | LH |
| Amperage | 175A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | LH |
|---|---|
| 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 |
Product FAQs
8 answersWhich panelboards are compatible with the LH36175 circuit breaker?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes the proprietary I-Line plug-in mounting system, which connects directly to the bus stack.
What wire sizes and materials are supported by the terminals on the LH36175?
The standard lugs accept either one 1 AWG to 600 kcmil conductor or two 1 AWG to 250 kcmil conductors. The terminals are rated for both aluminum and copper (Al/Cu) wiring.
What does the LI trip function indicate on this L-frame breaker?
The LI designation means the breaker features Long-Time (thermal) and Instantaneous (magnetic) trip functions. While the thermal overload protection is fixed at 175 amps, the magnetic short-circuit pickup is adjustable to coordinate with downstream loads.
Is the LH36175 suitable for direct current (DC) systems?
Yes, this thermal-magnetic breaker is rated for DC applications. It provides an interrupting capacity of 50kA at 250VDC and 20kA at 500VDC.
Is the LH36175 a current production breaker or a legacy model?
The LH36175 is part of the legacy Square D L-frame series. While still widely used in existing I-Line installations, modern replacements for this 175-amp breaker often utilize the PowerPact J-frame series (such as the JGA36175), which requires an HNM1BL filler plate to fit the same I-Line space.
How does the I-Line mounting style work on the LH36175?
The I-Line plug-in connection allows the breaker to mount directly onto the panelboard bus assembly. This eliminates the need for bolted bus connections, speeding up installation and ensuring a secure mechanical and electrical connection.
Does the LH36175 provide ground fault protection?
No, the LH36175 features an LI (Long-Time and Instantaneous) trip unit. It does not include the Ground Fault (G) function required for equipment ground fault protection.
Can the LH36175 be used in 240V or 480V systems?
Yes, while it has a maximum voltage rating of 600VAC, it is fully compatible with 240VAC and 480VAC systems. The interrupting rating (AIC) increases at lower voltages, offering up to 65kA at 240VAC and 35kA at 480VAC.
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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