Square D MHL368001212 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Square D
MHL368001212
Molded Case Circuit Breaker
Brand
Square D
SKU
MHL368001212
Quantity
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Square D MHL368001212 - 800A 3 Pole Molded Case Circuit Breaker
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Description
Built for industrial power distribution, the Square D MHL368001212 is a 3-pole, 800A molded case circuit breaker. It belongs to the legacy M-frame family, providing reliable thermal-magnetic protection. This unit-mount breaker installs into compatible Square D switchboards and motor control centers. It replaces the discontinued MJL36800. Rated for 65kAIC at 480VAC, it features fixed thermal and adjustable magnetic settings. A factory-installed 1A/1B auxiliary switch and lugs are included.Specifications
| Brand | Square D |
|---|---|
| Part Number | MHL368001212-R |
| Series | MHL |
| Amperage | 800A |
| 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, 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) (Factory Installed), Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhat does the 1212 suffix indicate on the MHL368001212 catalog number?
The 1212 suffix designates that this breaker includes a factory-installed 1A/1B auxiliary switch.
Which obsolete Square D breaker does the MHL368001212 replace?
This breaker serves as a direct replacement for the discontinued MJL36800 circuit breaker.
Is this breaker compatible with Square D I-Line panelboards?
No. The MHL368001212 is a unit-mount breaker designed for switchboards, motor control centers, and enclosures. It does not have the plug-on jaw connections required for I-Line panels.
What wire sizes are accepted by the lugs on this 800A breaker?
The factory-installed lugs accommodate three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase.
How do the trip adjustments work on the MHL368001212?
This thermal-magnetic breaker features a fixed thermal element for long-time overload protection and an adjustable magnetic element, allowing you to dial in the instantaneous short-circuit trip threshold.
What is the replacement lug kit part number for the MHL368001212?
The correct replacement mechanical lug kit for this M-frame breaker is the Square D AL900MA.
Does the MHL368001212 use a Micrologic electronic trip unit?
No, this legacy M-frame breaker uses a standard thermal-magnetic trip unit. It does not feature electronic or solid-state trip functions.
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