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Eaton / Cutler-Hammer MDL3350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Unit Mount
Eaton / Cutler-Hammer
MDL3350
Molded Case Circuit Breaker
Brand
Eaton / Cutler-Hammer
SKU
MDL3350
Quantity
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Eaton / Cutler-Hammer MDL3350 - 350A 3 Pole Molded Case Circuit Breaker
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Description
Built for demanding commercial environments, the Eaton MDL3350 is a 3-pole, 350A MCCB. As part of the Series C M-Frame family, it provides dependable long-time and instantaneous (LI) trip functions. This unit-mount breaker installs into Eaton Series C panelboards and motor control centers. It includes standard lugs for 1 AWG to 500 kcmil wire. Rated at 65 kAIC at 240V, it offers high interrupting capacity. The unit is HACR rated and supports reverse feed capabilities.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Series | MDL |
| Amperage | 350A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | MDL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 1 AWG-500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs |
| Standards | HACR Rated, UL 489, CSA C22.2 No. 5, IEC 60947-2, NEMA AB-1 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
6 answersWhat is the difference between the MDL3350 and the HMDL3350?
The MDL3350 is the standard interrupting capacity version. The HMDL3350 is the high-interrupting capacity variant of the same 350A M-Frame breaker. Both share the same physical dimensions and mounting footprint, but the HMDL version is required for systems with higher available fault currents.
Can I install field accessories like shunt trips or auxiliary switches on the MDL3350?
Yes, Eaton Series C M-Frame breakers support a variety of field-installable internal accessories, including shunt trips, undervoltage releases (UVR), and auxiliary contacts. These install under the front accessory cover.
How are the conductors terminated on the MDL3350?
The breaker comes with standard mechanical lugs that accept two conductors per phase. The lugs are dual-rated for aluminum or copper wire ranging from 1 AWG to 500 kcmil, making them suitable for parallel conductor installations.
Can I adjust the trip settings on the MDL3350?
No, the MDL3350 comes with a fixed thermal and fixed magnetic trip unit. If your application requires adjustable short-circuit or overload settings, you will need to select a breaker equipped with an electronic trip unit instead of this standard thermal-magnetic model.
Is the MDL3350 a plug-on or bolt-on breaker?
The MDL3350 is a unit-mount, bolt-on circuit breaker. It is designed to be hard-mounted into Eaton and Cutler-Hammer Series C panelboards, switchboards, and motor control centers, rather than snapping onto a bus.
Is the MDL3350 a complete breaker or just the frame?
The MDL3350 is a complete, assembled circuit breaker. It includes both the MDL frame and the 350A thermal-magnetic trip unit (catalog number MT3350T) installed from the factory.
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