Square D MHL363501212 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Square D
MHL363501212
Molded Case Circuit Breaker
Brand
Square D
SKU
MHL363501212
Quantity
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Square D MHL363501212 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Integrating remote signaling capabilities, this 350-amp MCCB includes a factory-installed 1A/1B auxiliary switch for advanced monitoring. The unit-mount design fastens securely into Square D switchboards and motor control centers. Rated for 65kA at 480VAC, it utilizes thermal-magnetic LI protection. For modern replacements, the PowerPact MJL36350 paired with an S29450 auxiliary contact block serves as the manufacturer's recommended upgrade path for this legacy M-Frame component.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHL36350-1212 |
| 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 | Switchboards, Motor Control Centers, Industrial 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Auxiliary Switch (1A/1B), Lugs |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
6 answersWhat does the 1212 suffix indicate on the MHL363501212 catalog number?
The 1212 suffix signifies that the breaker comes with a factory-installed 1A/1B auxiliary switch, which provides remote signaling of the breaker's open or closed status.
What is the modern replacement for the legacy MHL363501212?
The MHL363501212 is a legacy M-Frame breaker. The manufacturer's recommended upgrade path for modern applications is the PowerPact M-Frame series, specifically the MJL36350 paired with an S29450 auxiliary contact block to match the factory-installed switch.
How do you adjust the trip settings on the MHL363501212?
This thermal-magnetic breaker features a fixed thermal element for long-time protection at 350 amps. However, the magnetic instantaneous trip is adjustable, allowing electricians to fine-tune short-circuit protection for selective coordination.
What type of mounting does the MHL363501212 require?
This is a unit-mount, feed-thru circuit breaker. It is designed to be bolted directly to the backpan of industrial enclosures, motor control centers, or switchboards, and does not plug into an I-Line bus.
What are the wire size requirements for the MHL363501212 lugs?
The standard mechanical lugs on this breaker accept up to three 3/0 AWG to 500 kcmil conductors per phase. They are rated for both aluminum and copper wiring.
Is the MHL363501212 suitable for direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for 250VDC applications with a 14kA interrupting capacity.
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