Square D MHL365001287 Molded Case Circuit Breaker
- 500A
- 3 Pole
- Unit Mount
Quantity
Square D MHL365001287 - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for industrial applications, the Square D MHL365001287 is a 3-pole, 500A MCCB. This legacy M-Frame breaker delivers reliable thermal-magnetic (LI) protection for heavy-duty systems. The unit mount design installs into Square D switchboards and motor control centers. It serves as a direct replacement for older setups, while newer designs use the MJL36500. Rated 65kAIC at 480VAC, it includes a factory-installed 48VDC UVR and 1A/1B auxiliary switch, plus line and load lugs.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHL365001287-R |
| Series | MHL |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 50kA @ 250VDC |
| Frame Type | M |
|---|---|
| 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, Alarm Switch |
|---|---|
| Accessories | Auxiliary Switch (1A/1B) (Factory Installed), Undervoltage Release (48VDC) (Factory Installed), Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhat is the modern replacement for the legacy Square D MHL365001287?
The MHL365001287 is a legacy M-Frame breaker. Square D has officially replaced this series with the PowerPact M-Frame, specifically the MJL36500. When upgrading to a PowerPact breaker, note that different mounting hardware or enclosure modifications may be required.
What does the 1287 suffix mean on the MHL365001287?
The 1287 suffix indicates that the breaker comes equipped with factory-installed accessories. For this specific model, it includes a 1A/1B auxiliary switch for remote status monitoring and a 48VDC Undervoltage Release (UVR).
Can the MHL365001287 be used in DC power systems?
Yes, in addition to its standard AC ratings (up to 600VAC), this breaker is rated for 250VDC applications with an interrupting capacity of 50kAIC.
Are the lugs on the MHL365001287 rated for aluminum wire?
Yes, the factory-installed line and load lugs are dual-rated for both aluminum and copper (Al/Cu) conductors. They accept three 3/0 AWG to 500 kcmil wires per phase.
How does the trip unit on the MHL365001287 operate?
It utilizes a thermal-magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal protection (Long-Time) is fixed, while the magnetic (Instantaneous) trip setting is adjustable, allowing you to coordinate the breaker with your system's specific inrush currents and fault levels.
What types of equipment is the MHL365001287 designed to fit?
This unit mount, feed-thru breaker is designed for installation in Square D switchboards, motor control centers (MCCs), and standalone industrial enclosures.
What does unit mount mean for the MHL365001287?
Unit mount, also known as feed-thru, means the breaker is designed to be bolted directly to the backpan or mounting surface of an enclosure or switchboard. Unlike I-Line breakers that plug into a busbar, this breaker uses standard line and load lugs for hardwired connections.
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