Schneider Electric / Square D MJM36800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Schneider Electric / Square D
MJM36800
Molded Case Circuit Breaker
Brand
Schneider Electric / Square D
SKU
MJM36800
Quantity
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Schneider Electric / Square D MJM36800 - 800A 3 Pole Molded Case Circuit Breaker
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800A 3 Pole Molded Case Circuit Breaker
800A 3 Pole Molded Case Circuit Breaker
800A 3 Pole Molded Case Circuit Breaker
Description
Built to handle demanding electrical loads, this three-pole PowerPacT M-frame breaker utilizes advanced electronic trip technology for commercial facilities. The unit-mount design fits Square D QED switchboards and industrial control enclosures, easily replacing older MHL36800 models. Featuring an 80% continuous current rating and push-to-trip functionality, it ensures accurate long-time and instantaneous protection with a 65kA interrupting capacity at 480V.Specifications
| Brand | Schneider Electric / Square D |
|---|---|
| Part Number | MJM36800-R |
| Series | MJM |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MJM |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D QED Switchboards, Square D I-Line Panelboards (Main Breaker), Industrial Control Panels |
| 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, Motor Operator, Lug Kits |
|---|---|
| Accessories | Line Side Lugs, Load Side Terminal Nuts |
| 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 | HACR Rated, 80% Rated, Push-to-trip, Non-Interchangeable Trip, Quick-Make/Quick-Break, Visual Trip Indicator, True RMS Sensing, RoHS Compliant |
Product FAQs
5 answersHow are the line and load connections configured on the MJM36800?
This unit-mount breaker is configured with mechanical lugs on the line side and terminal nuts on the load side. The line lugs accept three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase.
What adjustability does the ET 1.0 LI trip unit provide?
The ET 1.0 electronic trip unit features adjustable long-time (L) and instantaneous (I) protection. This allows panel builders to fine-tune the breaker's response curve to specific system overloads and short circuits.
Can the MJM36800 be used as a branch breaker in an I-Line panelboard?
No. The MJM36800 is a unit-mount, bolt-on breaker. While it is approved for use as a main breaker in I-Line panelboards, it lacks the plug-on jaw connections required for I-Line branch applications.
Is the MJM36800 a direct replacement for older Square D 800A breakers?
The PowerPacT M-frame MJM36800 can often replace legacy Square D 800A unit-mount breakers, but physical dimensions and busbar connections may differ. Always verify the enclosure depth and mounting footprint before retrofitting.
What safety precautions are required when installing this 800A breaker?
Installation must be performed by a licensed electrician. Always de-energize the switchboard or panel before installation and verify power is off using a properly rated voltage sensing device. Ensure all lug connections are torqued to the manufacturer specifications to prevent overheating.
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