Square D MHL36800-1212 MHL368001212 - 800A 3 Pole Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Square D
MHL36800-1212
MHL368001212 - 800A 3 Pole Molded Case Circuit Breaker
Brand
Square D
SKU
MHL36800-1212
Quantity
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Square D MHL368001212 - 800A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for heavy-duty industrial applications, the Square D MHL36800-1212 is a 3-pole, 800A molded case circuit breaker. It delivers reliable thermal-magnetic protection with fixed long-time and adjustable instantaneous trip functions. This unit-mount breaker installs into compatible Square D switchboards and motor control centers. As a legacy M-Frame device, it is replaced by the modern PowerPact MJL36800. Rated for 65kAIC at 480VAC, it includes a factory-installed 1A/1B auxiliary switch.Specifications
| Brand | Square D |
|---|---|
| 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 |
| 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, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip, Common Trip, Trip-Free Mechanism |
Product FAQs
5 answersWhat does the -1212 suffix mean on the MHL36800-1212 catalog number?
The -1212 suffix indicates the breaker comes with a factory-installed 1A/1B auxiliary switch. This provides one normally open and one normally closed contact for remote status signaling.
Can the MHL36800-1212 replace older Square D breakers?
Yes, the MHL36800-1212 is a direct replacement for the discontinued Square D MJL36800 circuit breaker. It shares the same physical M-frame footprint and electrical ratings.
How is a unit-mount breaker like the MHL36800-1212 installed?
As a unit-mount, feed-thru breaker, it bolts directly to the backpan or mounting plate inside a switchboard or industrial enclosure. It does not plug onto a busbar like an I-Line panelboard breaker.
How do the trip adjustments work on the MHL36800-1212?
This breaker uses a thermal-magnetic trip unit with LI functions. The thermal element for long-time overload protection is fixed at 800 amps, while the magnetic element for instantaneous short-circuit protection is adjustable via a dial on the face of the breaker.
What safety and application standards does the MHL36800-1212 meet?
This breaker is UL 489 listed and CSA certified. It is also HACR rated, making it suitable for heating, air conditioning, and refrigeration motor loads.
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