Square D MEL36600LSG Molded Case Circuit Breaker
- 600A
- 3 Pole
- Unit Mount
Quantity
Square D MEL36600LSG - 600A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for heavy-duty commercial applications, this 600-amp M-Frame breaker provides precise coordination through its adjustable Long-Time, Short-Time, and Ground-Fault (LSG) Micrologic trip unit. It installs into standard Square D switchboards and industrial enclosures requiring unit-mount configurations. While this specific legacy profile has been succeeded by the PowerPacT L-Frame series, it remains an essential exact-fit replacement for maintaining existing electrical infrastructure.Specifications
| Brand | Square D |
|---|---|
| Part Number | MEL36600LSG-R |
| Series | MEL |
| Amperage | 600A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC |
| Amperage Range | 300-600A |
|---|
| Frame Type | MEL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Switchboards, Enclosures |
| 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, True RMS Sensing, 100% Rated |
Product FAQs
5 answersIs the MEL36600LSG designed for I-Line panelboards?
No. The MEL frame is a unit-mount circuit breaker designed to be bolted directly to a backpan in switchboards or individual enclosures. For I-Line plug-on applications, you would need an I-Line equivalent such as the MGL frame.
What wire sizes are accepted by the lugs on the MEL36600LSG?
The factory lugs accept three 3/0 AWG to 500 kcmil conductors per phase. These terminals are dual-rated for both copper and aluminum wire.
What adjustments are available on the LSIG Micrologic trip unit?
The LSIG designation means this electronic trip unit provides adjustable settings for Long-Time, Short-Time, Instantaneous, and Ground-Fault protection. This allows for precise selective coordination with other breakers in your electrical system.
Can the trip unit on the MEL36600LSG be replaced or upgraded in the field?
No. This breaker features a non-interchangeable trip unit. The Micrologic electronic trip system is factory-sealed and cannot be swapped for a different rating plug or trip module.
Does the MEL36600LSG provide equipment ground-fault protection?
Yes. The G in the LSIG trip unit indicates integrated ground-fault protection for equipment. Note that if you are installing this in a 3-phase, 4-wire system, an external neutral current transformer is typically required to properly monitor unbalanced loads and prevent nuisance tripping.
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