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Square D MGA36450 Molded Case Circuit Breaker
- 450A
- 3 Pole
- I-Line
Square D
MGA36450
Molded Case Circuit Breaker
Brand
Square D
SKU
MGA36450
Quantity
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Square D MGA36450 - 450A 3 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty industrial applications, the 450A M-frame breaker provides highly accurate electronic trip protection. The solid-state circuitry ensures reliable LI fault response, offering better coordination than standard thermal-magnetic options. The device installs into Square D I-Line panelboards, leveraging a proven plug-on design. It substitutes discontinued MA36450 breakers in existing infrastructure.Specifications
| Brand | Square D |
|---|---|
| Series | MGA |
| Amperage | 450A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Frame Type | MGA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards, Square D I-Line Switchboards |
| Wire Gauge | 3x 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 |
| Trip Unit Model | ET 1.0 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment, Rotary Handle, Lug Kits |
|---|---|
| Accessories | Lugs (Load Side) |
| 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, Non-Interchangeable Trip, Visual Trip Indicator, 80% Rated, RoHS Compliant, Mercury Free, PVC Free |
Product FAQs
6 answersWhat panelboards accept the MGA36450 circuit breaker?
This PowerPacT M-frame breaker installs directly into Square D I-Line panelboards and switchboards. It requires 9 inches of vertical mounting space on the bus assembly.
Can the MGA36450 be used to replace older MA36450 breakers?
Yes, the MGA36450 is the direct modern replacement for the legacy MA36450. It upgrades the older thermal-magnetic protection to a highly accurate ET 1.0 electronic trip unit while maintaining the exact same I-Line mounting footprint.
How are the line and load connections configured on this breaker?
The line side utilizes an integral I-Line plug-on bracket that connects directly to the panelboard bus. The load side is equipped with mechanical lugs that accept three 3/0 AWG to 500 kcmil aluminum or copper conductors per phase.
What type of protection does the ET 1.0 trip unit provide?
The solid-state ET 1.0 electronic trip unit delivers LI (Long-Time and Instantaneous) fault protection. It features a fixed long-time pickup and an adjustable instantaneous trip setting for precise coordination with downstream devices.
Are the load lugs factory-installed on the MGA36450?
Yes, the breaker comes standard with factory-installed mechanical lugs on the load side. No additional lug kits are required for standard 3/0 AWG to 500 kcmil wiring.
Is the MGA36450 rated for 80 percent or 100 percent continuous current?
This PowerPacT M-frame breaker carries a standard 80 percent continuous current rating.
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