Square D MA36300 Molded Case Circuit Breaker
- 300A
- 3 Pole
- I-Line
Quantity
Square D MA36300 - 300A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial power distribution, the MA36300 is a 3-pole, 300A molded case circuit breaker from Square D. It provides robust overcurrent protection for heavy-duty electrical systems. This breaker features an I-Line plug-on mounting style, allowing for quick installation into compatible Square D I-Line panelboards and switchboards. As a discontinued legacy model, it is an exact replacement for existing setups. It offers fixed thermal and adjustable magnetic protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | PC32500RC |
| Series | MA |
| Amperage | 300A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 14kA @ 250VDC |
| Frame Type | Rating Plug |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | (3) 3/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| 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 |
|---|---|
| Accessories | Load Side Lugs (AL900MA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat panelboards are compatible with the MA36300?
This breaker features an I-Line plug-on mounting style and is designed exclusively for use in Square D I-Line panelboards and switchboards.
How does the I-Line connection work on the MA36300?
The line side of the breaker features plug-on jaws that attach directly to the I-Line bus assembly. The load side utilizes standard mechanical lugs for the branch circuit wiring.
What is the recommended lug torque for the MA36300?
The standard AL900MA mechanical lugs accept three 3/0 AWG to 500 kcmil aluminum or copper conductors. These lugs should be torqued to 300.9 lbf-in (34 N.m).
How does the adjustable magnetic trip function on this breaker?
The MA36300 features a fixed thermal and adjustable magnetic trip unit. The adjustable magnetic dial allows you to tune the instantaneous short-circuit response, which helps coordinate with downstream devices and prevents nuisance tripping from high motor inrush currents.
Is the MA36300 a current production model?
No, the Square D M-frame is a discontinued legacy series. However, the MA36300 serves as an exact drop-in replacement for existing M-frame installations, allowing you to restore power without modifying the panelboard bus.
Can the MA36300 be used in DC applications?
Yes, in addition to its AC ratings, this breaker is rated for up to 250VDC with a 14kAIC interrupting capacity, making it suitable for specific industrial DC power systems.
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