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Square D MJA36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- I-Line
Square D
MJA36800
Molded Case Circuit Breaker
Brand
Square D
SKU
MJA36800
Quantity
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Square D MJA36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D MJA36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | MJA36800 |
| Series | MJA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | 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 | Electronic Trip |
|---|---|
| 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 (AL800M23K) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, 80% Rated, Push-to-Trip, Non-Interchangeable Trip, Visual Trip Indicator, Trip-Free Mechanism, Quick-Make/Quick-Break |
Quantity
Square D MJA36800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | MJA36800 |
| Series | MJA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | 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 | Electronic Trip |
|---|---|
| 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 (AL800M23K) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, 80% Rated, Push-to-Trip, Non-Interchangeable Trip, Visual Trip Indicator, Trip-Free Mechanism, Quick-Make/Quick-Break |
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Description
Engineered for commercial and industrial power distribution, the MJA36800 is a 3-pole, 800A molded case circuit breaker from Square D's PowerPacT M-Frame family. It installs into I-Line panelboards and switchboards, serving as a seamless modern replacement for legacy MA and MH frame breakers. Rated for 65 kAIC at 480VAC, this unit utilizes an advanced electronic trip system with fixed thermal and adjustable magnetic settings to ensure precise coordination and reliable system protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | MJA36800 |
| Series | MJA |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | 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 | Electronic Trip |
|---|---|
| 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 (AL800M23K) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, NOM-003-SCFI-2000, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | Current Limiting, HACR Rated, 80% Rated, Push-to-Trip, Non-Interchangeable Trip, Visual Trip Indicator, Trip-Free Mechanism, Quick-Make/Quick-Break |
Product FAQs
7 answersCan the MJA36800 be used to replace older Square D MA or MH frame circuit breakers?
Yes, the MJA36800 from the PowerPacT M-Frame series serves as a direct modern replacement for legacy MA36800 and MH36800 800-amp molded case circuit breakers.
How much mounting space does the MJA36800 require in an I-Line panelboard?
The MJA36800 requires 9 inches of vertical mounting height within a standard Square D I-Line panelboard or switchboard.
Is the Square D MJA36800 circuit breaker 100% rated for continuous current?
No, this breaker has a standard 80% continuous current rating. It is not listed for 100% continuous operation.
Does the MJA36800 come with line and load lugs?
Because it is an I-Line circuit breaker, the MJA36800 features plug-on jaw connections on the line side for snapping directly onto the panel bus. Standard mechanical lugs are only provided on the load side.
What does the "J" in the MJA36800 catalog number signify?
The "J" indicates Square D's J-level interrupting capacity. For this frame size, it provides a 100kA rating at 240V, 65kA at 480V, and 25kA at 600V.
What type of trip unit adjustments are available on the MJA36800?
The MJA36800 features an electronic trip unit with a fixed Long-Time pickup and an adjustable Instantaneous pickup. This allows you to tune the short-circuit magnetic trip threshold to suit your specific application needs.
What does the "A" in the MJA36800 catalog number indicate?
In the PowerPacT nomenclature, the "A" specifies an I-Line plug-on configuration. If you need a unit-mount version of this breaker with lugs on both ends, you would need the MJL36800 model instead.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 2 reviews.
Total 5 star reviews: 2 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
2 reviews
- JKJosh K.ReviewingSquare D MJA36800 - 800A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/12/21Great Price
Great breaker and Price.
- KPKevin P.ReviewingSquare D MJA36500 - 500A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/26/21Easy to order
Easy to order with good pricing!