Square D MXL36600G Molded Case Circuit Breaker
- 600A
- 3 Pole
- Unit Mount
Quantity
Square D MXL36600G - 600A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for heavy-duty distribution, the Square D MXL36600G is a 3-pole, 600A electronic trip circuit breaker providing robust microprocessor-based sensing. The unit-mount design integrates into Square D switchboards and motor control centers. For modern upgrades, it is replaced by the PowerPacT L-Frame (LJL36600U44X) via a retrofit kit. Rated 65kAIC at 480V, it offers fully adjustable LSIG protection, covering long-time, short-time, instantaneous, and ground fault parameters.Specifications
| Brand | Square D |
|---|---|
| Series | MXL |
| Amperage | 600A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 300-600A |
|---|
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D Switchboards, Motor Control Centers |
| 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 | LSIG |
| Trip Function | Long-Time, Short-Time, Instantaneous, Ground Fault |
| Trip Adjustability | Adjustable |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Micrologic Trip Unit, Lugs |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip |
Product FAQs
7 answersWhat is the modern replacement for the legacy MXL36600G circuit breaker?
The MXL36600G is a legacy M-frame breaker. For modern upgrades, it is replaced by the Square D PowerPacT L-Frame, specifically catalog number LJL36600U44X, which requires a retrofit kit for installation in existing switchboards or motor control centers.
What does the LSIG trip function on the MXL36600G include?
The electronic Micrologic trip unit provides fully adjustable LSIG protection. This includes Long-Time, Short-Time, Instantaneous, and Ground-Fault parameters, allowing for precise coordination in heavy-duty distribution systems.
What wire sizes are compatible with the lugs on the MXL36600G?
The factory lugs accept three aluminum or copper conductors per phase, ranging from 3/0 AWG to 500 kcmil.
How is the MXL36600G installed in a panel?
This is a unit-mount, feed-thru circuit breaker. It bolts directly to the mounting pan or structure in Square D switchboards and motor control centers rather than plugging onto a bus.
Can the MXL36600G be used on a 600V system?
Yes, it is rated for up to 600VAC. However, the interrupting capacity drops to 25kA at 600V, compared to its 65kA rating at 240V and 480V. Ensure your system fault current does not exceed this limit.
Is the MXL36600G interchangeable with other Square D frames?
No, the MXL36600G is a specific legacy M-frame breaker. Upgrading to a modern PowerPacT L-frame requires a dedicated retrofit kit to adapt the mounting and bus connections.
Does the MXL36600G provide ground fault protection for equipment?
Yes, the G in the LSIG trip function indicates that this breaker includes integral ground-fault protection for equipment, which is adjustable via the electronic trip unit.
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