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Square D MA36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- I-Line
Square D
MA36800
Molded Case Circuit Breaker
Brand
Square D
SKU
MA36800
Quantity
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Square D MA36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
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Square D MA36800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | MA36800-R |
| Series | MA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Quantity
Square D MA36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | MA36800 |
| Series | MA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
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Description
Rated 30 kAIC at 480VAC, the MA36800 is a robust 3-pole, 800A molded case circuit breaker from Square D. As part of the legacy M-Frame family, it provides reliable thermal magnetic protection with an adjustable magnetic trip for industrial power systems. The breaker mounts into I-Line panelboards and switchboards, featuring a plug-on connection that simplifies maintenance and minimizes downtime. It includes Visi-Trip technology for quick fault identification and is replaced by the MGA36800.Specifications
| Brand | Square D |
|---|---|
| Part Number | MA36800 |
| Series | MA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
8 answersCan I install the MA36800 in a standard Square D QO or NQ panelboard?
No. The MA36800 features an I-Line plug-in mounting style and is designed exclusively for use in heavy-duty Square D I-Line panelboards and switchboards. It will not fit in standard QO or NQ load centers.
What wire sizes and materials are supported by the standard lugs on the MA36800?
The factory lugs accept three 3/0 AWG to 500 kcmil aluminum or copper (Al/Cu) conductors per phase. Installers must ensure that appropriate torque settings are applied based on the conductor material and gauge.
Is the trip unit on the MA36800 adjustable?
Yes, the magnetic (instantaneous) trip function is adjustable to allow for proper coordination with downstream devices. The thermal (long-time) trip function is fixed at the 800-amp rating.
What is the modern replacement for the obsolete MA36800 breaker?
The legacy MA36800 M-Frame breaker has been superseded by the PowerPact M-Frame series. Its direct modern equivalent is the MGA36800, which offers the same 800-amp, 3-pole I-Line configuration but utilizes an updated ET 1.0 electronic trip unit.
How does the MA36800 connect to the busbar in a panelboard?
As an I-Line style molded case circuit breaker, the line side features a plug-in connection designed for the proprietary Square D I-Line bus stack. This design simplifies installation and eliminates line-side wire bending within the enclosure.
Is the MA36800 suitable for HVAC applications?
Yes, the MA36800 circuit breaker is HACR rated. It is certified to provide safe and reliable protection for heating, air conditioning, and refrigeration equipment in commercial and industrial electrical systems.
Can I swap the thermal-magnetic trip unit on the MA36800 for an electronic version?
No. The MA36800 is a legacy M-Frame breaker equipped with a factory-installed thermal-magnetic trip unit that cannot be swapped or upgraded in the field. Upgrading to electronic trip functions requires replacing the entire breaker with a modern PowerPact M-Frame unit.
How can I visually verify if the MA36800 has tripped during a fault?
The breaker features a visual trip indicator. When it trips due to an overload or short circuit, the operating handle moves to a central tripped position. This allows for quick fault identification in a crowded panelboard before the device is safely reset.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
1 review
- DHDave H.ReviewingSquare D MA36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/6/25Never had a problem
We like the service and the prices. The re-certified are great for projects that we have in house.