Square D MHL3612001288 Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Unit Mount
Quantity
Square D MHL3612001288 - 1200A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for industrial power distribution, the Square D MHL3612001288 is a 1200A, 3-pole MCCB. It features thermal-magnetic trip technology with fixed thermal and adjustable magnetic (LI) protection. The 1288 suffix indicates a factory-installed 48VDC shunt trip. This unit-mount M-Frame breaker integrates into Square D switchboards and motor control centers. It delivers 65kA interrupting capacity at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHL3612001288-R |
| Series | MHL |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers |
| Wire Gauge | (4) 1/0 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 1/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Line and Load Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | High Interrupting Capacity, HACR Rated, Non-Interchangeable Trip |
Product FAQs
6 answersWhat does the 1288 suffix indicate on the MHL3612001288 catalog number?
The 1288 suffix indicates that this circuit breaker includes a factory-installed 48VDC shunt trip accessory.
What wire sizes are accepted by the lugs on this breaker?
The line and load side lugs accept four 1/0 AWG to 350 kcmil aluminum or copper conductors per phase.
Can the trip unit on the MHL3612001288 be swapped or upgraded?
No, this legacy M-frame breaker features a non-interchangeable thermal-magnetic trip unit.
What is the modern replacement for the legacy Square D M-frame 1200A breaker?
For modern upgrades, the legacy M-frame is typically replaced by the Square D PowerPact P-frame series, such as the PJL36120U44A, depending on your specific system requirements.
What types of equipment is this breaker designed to be installed in?
It is designed for use in Square D switchboards and motor control centers that accommodate unit-mount M-frame breakers.
How is the trip unit configured on this model?
It includes Long-Time and Instantaneous (LI) trip functions, featuring a fixed thermal setting and an adjustable magnetic setting.
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