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Square D MH36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- I-Line
Square D
MH36800
Molded Case Circuit Breaker
Brand
Square D
SKU
MH36800
Quantity
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Square D MH36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D MH36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | MH36800 |
| Series | MH |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | MH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, 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 |
|---|---|
| Accessories | Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Visual Trip Indicator |
Quantity
Square D MH36800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | MH36800-R |
| Series | MH |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | MH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, 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 |
|---|---|
| Accessories | Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Visual Trip Indicator |
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Description
Built for demanding industrial applications, the MH36800 is an 800-amp, 3-pole molded case circuit breaker from Square D. It utilizes a thermal-magnetic trip unit with fixed thermal and adjustable magnetic settings to protect against overloads. Designed exclusively for Square D I-Line panelboards and switchboards, this breaker utilizes a specialized plug-on mounting style. For modern upgrades, this legacy M-frame unit is replaced by the MJA36800 electronic trip breaker. Rated 65 kAIC at 480V.Specifications
| Brand | Square D |
|---|---|
| Part Number | MH36800 |
| Series | MH |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | MH |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, 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 |
|---|---|
| Accessories | Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Visual Trip Indicator |
Product FAQs
6 answersWhat type of panelboard accepts the MH36800 circuit breaker?
The MH36800 is engineered exclusively for Square D I-Line panelboards and switchboards. Its specialized plug-on connection requires a compatible I-Line bus stack and cannot be installed in standard NEMA bolt-on enclosures or standard load centers.
How much panel space is required to mount the MH36800?
As a legacy M-Frame circuit breaker, the MH36800 requires 9 inches of vertical mounting space on an I-Line panelboard bus stack.
What is the modern replacement for the legacy Square D MH36800?
The legacy thermal-magnetic MH36800 is directly upgraded to the modern PowerPacT M-Frame series, specifically the MJA36800 electronic trip breaker. The MJA36800 maintains the same 800-amp capacity, I-Line mounting footprint, and matching 65kA at 480V interrupting rating.
What wire sizes are supported by the MH36800 load terminals?
Equipped with AL900MA lugs, this breaker accepts three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase. Installers must verify that the enclosure provides adequate wire bending space for an 800-amp multi-conductor run.
Does the MH36800 require external hardware to secure it to the panel?
No additional electrical mounting hardware is needed. The I-Line breaker jaws plug directly onto the bus stack, while a built-in mounting foot on the back of the breaker bolts directly to the panelboard's mounting pan for mechanical stability.
How is the trip unit adjusted on the MH36800?
This breaker features a fixed thermal rating for long-time overload protection and an adjustable magnetic dial on the faceplate for instantaneous short-circuit protection. The magnetic dial must be set by a qualified professional to align with the facility's specific coordination study.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 4 reviews.
Total 5 star reviews: 4 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
4 reviews
- DLDeanna L.Verified BuyerReviewingSquare D MH36800 - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/11/26Square D MH36800 - 800A 3 Pole Molded Case Circuit Breaker
Another satisfied customer.
- SBSteve B.Verified BuyerReviewingSquare D MH36600 - 600A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/23/26Square MH36600
Breaker was as advertised excellent condition
- SAStewart A.ReviewingSquare D MH38 Panel Board EnclosureI recommend this productRated 5 out of 5 stars3/25/19not at local supply
got what I needed, because it was not available at my local supply house.
- WWWilliam W.ReviewingSquare D MH32 Panel Board EnclosureI recommend this productRated 5 out of 5 stars7/1/18INSIDE THE BOX
Great Buy ! Shipped on time. No Damage. Just what we ordered Thanks