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Square D MJA36500 Molded Case Circuit Breaker
- 500A
- 3 Pole
- I-Line
Square D
MJA36500
Molded Case Circuit Breaker
Brand
Square D
SKU
MJA36500
Quantity
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Square D MJA36500 - 500A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty industrial applications, the MJA36500 is a 500A, 3-pole molded case circuit breaker. It features an ET 1.0 electronic trip unit providing precise long-time and instantaneous (LI) protection. This PowerPacT M-Frame breaker plugs into Square D I-Line panelboards and switchboards. It is also an ideal replacement for aging MA and MH frame units. With a 65kAIC rating at 480V, this current-limiting breaker ensures robust fault clearing and system coordination.Specifications
| Brand | Square D |
|---|---|
| Series | MJA |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MJA |
|---|---|
| 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 | 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 (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 | HACR Rated, Current Limiting, Mercury Free, PVC Free, Push-to-Trip, 80% Rated |
Product FAQs
7 answersWhat type of panelboards accept the MJA36500 circuit breaker?
This breaker features an I-Line style plug-in connection, meaning it is specifically designed to mount onto the bus of Square D I-Line panelboards and switchboards. The line side connects directly to the I-Line bus, while the load side uses standard mechanical lugs.
Are the trip settings adjustable on the MJA36500?
Yes, partially. This breaker is equipped with an ET 1.0 solid-state electronic trip unit providing Long-Time and Instantaneous (LI) protection. The long-time pick-up is fixed at the 500A rating, while the instantaneous (magnetic) trip function is adjustable to help coordinate fault protection within your electrical system.
What are the wire size capabilities for the load-side lugs?
The factory-installed load lugs can accommodate up to three conductors per phase, accepting 3/0 AWG through 500 kcmil wire. The lugs are dual-rated for use with either aluminum (Al) or copper (Cu) conductors.
Is the electronic trip unit on this PowerPacT M-frame breaker interchangeable?
No, the basic ET 1.0 solid-state trip unit provided with the MJA36500 is factory-sealed and non-interchangeable.
Can the MJA36500 be used to replace older Square D breakers?
Yes, the PowerPacT M-frame I-Line circuit breakers provide a direct upgrade and replacement path for legacy Square D MA and MH frame breakers in existing panelboards.
What does the J rating signify in the MJA36500 part number?
In the PowerPacT M-frame series nomenclature, the J designates the specific interrupting capacity level. For this breaker, it signifies a maximum interrupting rating of 100kA at 240VAC, 65kA at 480VAC, and 25kA at 600VAC.
Does the MJA36500 offer current-limiting protection?
Yes, this solid-state molded case circuit breaker is engineered with current-limiting performance, providing enhanced fault mitigation and operational safety for industrial electrical systems.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
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1 review
- KPKevin P.Rated 5 out of 5 stars1/26/21Easy to order
Easy to order with good pricing!