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Square D MJP36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Square D
MJP36800
Molded Case Circuit Breaker
Brand
Square D
SKU
MJP36800
Quantity
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Square D MJP36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
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Square D MJP36800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | MJP36800 |
| Series | MJP |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Panelboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Lugs (Load Side), Terminal Nuts (Line Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 80% Rated, HACR Rated, Non-Interchangeable Trip |
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Square D MJP36800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | MJP36800-R |
| Series | MJP |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Panelboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Lugs (Load Side), Terminal Nuts (Line Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 80% Rated, HACR Rated, Non-Interchangeable Trip |
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Description
The MJP36800 is an 800A, 3-pole electronic trip MCCB from Square D's PowerPact M-frame series. Built for commercial applications, it provides reliable power distribution. This unit-mount breaker installs into Square D switchboards, panelboards, and motor control centers. It is eventually replaced by the PJP36080U31A model. Featuring an electronic trip unit with Long-Time and Instantaneous (LI) functions, it allows for adjustable magnetic settings. It carries a 65kAIC rating at 480V.Specifications
| Brand | Square D |
|---|---|
| Part Number | MJP36800 |
| Series | MJP |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC, 25kA @ 600Y/347VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers, Panelboards |
| 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, Padlock Attachment |
|---|---|
| Accessories | Lugs (Load Side), Terminal Nuts (Line Side) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | -25C to 70C |
| Construction Features | 80% Rated, HACR Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat is the required tightening torque for the standard lugs on the MJP36800?
The standard mechanical lugs on this breaker (part number AL800M23K) require a tightening torque of 442.5 lb-in (50 N.m) when securing 3/0 AWG to 500 kcmil aluminum or copper conductors.
How many conductors can the standard line and load lugs accept?
Both the line and load side lugs on the MJP36800 are configured to accept up to three individual conductors per phase, supporting wire gauges from 3/0 AWG up to 500 kcmil.
What specific electronic trip unit comes with this M-frame breaker?
This breaker is equipped with the Square D ET 1.0 basic electronic trip unit. It delivers precise, fixed Long-Time (overload) and adjustable Instantaneous (short-circuit) tripping functions.
Can I swap or upgrade the ET 1.0 trip unit in the field?
No. The basic electronic trip system on PowerPacT M-frame circuit breakers is factory-sealed and not field-interchangeable. It also does not support add-on communication modules.
Is the MJP36800 rated for 100 percent continuous duty?
No, this is a standard 80 percent rated circuit breaker. Continuous electrical loads should not exceed 640 amps (80 percent of its 800A maximum rating) for periods lasting longer than three hours.
Does the MJP36800 replace older Square D 800-amp circuit breakers?
Yes, the PowerPacT M-frame series is the direct modern upgrade for legacy Square D MA-frame circuit breakers. The MJP36800 serves as a replacement for older 800A, 3-pole unit-mount models.
Is this circuit breaker compatible with Square D I-Line panelboards?
No. The MJP36800 is a unit-mount circuit breaker requiring bolted connections. For an I-Line panelboard, you must use an I-Line specific configuration of the PowerPacT M-frame.
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