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Square D MHL36350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Square D
MHL36350
Molded Case Circuit Breaker
Brand
Square D
SKU
MHL36350
Quantity
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Square D MHL36350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for heavy-duty industrial applications, this 350A unit-mount MCCB delivers reliable long-time and instantaneous (LI) trip functions. The fixed thermal and adjustable magnetic trip units offer tailored protection for motor control centers and commercial enclosures. While this specific M-Frame model has been superseded by the PowerPact MJL36350, it remains an exact fit for existing infrastructure requiring a 65kAIC rating at 480VAC without extensive panel modifications.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHL36350 |
| Series | MHL |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | MHL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, Enclosures |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
8 answersWhat type of panels or enclosures accept the MHL36350?
This unit-mount breaker is designed for installation in Square D switchboards, motor control centers, and individual commercial enclosures. It bolts directly to the mounting pan and is not compatible with plug-on I-Line panelboards.
What wire sizes are supported by the standard lugs on this breaker?
The standard lugs accept 3/0 AWG to 500 kcmil aluminum or copper conductors.
How does the adjustable magnetic trip function work on this breaker?
While the thermal overload protection is fixed at 350A, the magnetic trip is adjustable. This allows electricians to fine-tune the instantaneous short-circuit pickup level to coordinate with downstream protective devices or handle motor inrush currents without nuisance tripping.
What is the modern replacement for the legacy MHL36350?
The legacy Square D M-Frame series has been superseded by the PowerPact M-Frame series. The PowerPact MJL36350 is the direct modern replacement, providing the same 350A capacity and 65kAIC rating at 480VAC.
Can this breaker be used in direct current (DC) applications?
Yes, in addition to its standard alternating current ratings up to 600VAC, the MHL36350 is rated for use in 250VDC systems, where it provides an interrupting capacity of 14kAIC.
Does this breaker require a separate mounting base or DIN rail?
No, the MHL36350 is a heavy-duty unit-mount breaker that bolts directly to the backpan or mounting plate of a switchboard or enclosure. It is too large and heavy for standard DIN rail mounting.
What does the LI trip function code indicate on this M-Frame breaker?
The LI designation means the thermal-magnetic trip unit provides Long-Time (L) protection for sustained overloads and Instantaneous (I) protection for severe short circuits.
What does a feed-thru connection type mean for this breaker?
A feed-thru connection means the breaker is designed with standard lug terminals on both the line and load sides, allowing wire conductors to be terminated directly to the breaker without requiring specialized busbar connections.
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