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Square D MJL36450 Molded Case Circuit Breaker
- 450A
- 3 Pole
- Unit Mount
Square D
MJL36450
Molded Case Circuit Breaker
Brand
Square D
SKU
MJL36450
Quantity
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Square D MJL36450 - 450A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty environments, the Square D MJL36450 is a 3-pole, 450A MCCB from the PowerPacT M-Frame series. It delivers reliable power distribution for industrial control panels and switchboards. The unit-mount configuration connects via included lugs, accommodating (3) 3/0 AWG to 500 kcmil conductors. It easily replaces older MA36450 and MH36450 models. Equipped with an electronic trip unit, it offers fixed thermal and adjustable magnetic (LI) protection with a 65kAIC rating at 480V.Specifications
| Brand | Square D |
|---|---|
| Part Number | MJL36450 |
| Series | MJL |
| Amperage | 450A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MJL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Motor Control Centers, 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, Handle Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| 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, Current Limiting, 80% Rated, Mercury Free, PVC Free, Non-Interchangeable Trip |
Product FAQs
9 answersWhat does the "J" in MJL36450 stand for?
The "J" indicates the interrupting rating for this PowerPacT M-frame breaker, which provides 65 kA at 480 VAC and 100 kA at 240 VAC.
What type of trip unit is installed in the MJL36450?
It features a factory-sealed Basic Electronic Trip System (ET 1.0) with fixed long-time and adjustable instantaneous (LI) protection functions.
Can I install the MJL36450 in a Square D I-Line panelboard?
No. The MJL36450 is a unit-mount, feed-thru circuit breaker designed for lug connections. For I-Line panelboards, you will need an I-Line specific M-frame breaker, such as the MJA36450.
What does the 80% continuous current rating mean for the MJL36450?
As a standard 80% rated breaker, the MJL36450 is designed to carry a continuous load of up to 360 amps (80% of its 450A nominal rating) for periods lasting three hours or longer.
Can the MJL36450 be reverse fed?
Yes. PowerPacT M-frame circuit breakers with the basic ET 1.0 electronic trip unit do not have restrictive line and load markings, allowing them to be reverse fed.
What equipment is the MJL36450 compatible with?
This unit-mount breaker is designed for installation in Square D switchboards, motor control centers (MCCs), and industrial control panels.
Does the MJL36450 provide ground fault protection?
No. The MJL36450 features an ET 1.0 basic electronic trip unit with Long-Time and Instantaneous (LI) trip functions only. It does not include built-in ground fault (G) protection.
What is the difference between the MJL36450 and the MGL36450?
The difference is the interrupting rating. The MJL36450 features a "J" interrupting rating (65 kAIC at 480V), while the MGL36450 has a lower "G" interrupting rating (35 kAIC at 480V). Both are 450A, 3-pole, unit-mount M-frame breakers.
What lugs are standard on the MJL36450?
The MJL36450 comes factory-equipped with AL800M23K line and load lugs, which accept three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase.
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