Eaton / Cutler-Hammer LDC3450 Molded Case Circuit Breaker
- 450A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer LDC3450 - 450A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
The LDC3450 is a 3-pole, 450A MCCB from Eaton's Series C family. Built for industrial power distribution, this L-frame device provides reliable overcurrent protection. This unit-mount breaker integrates with Pow-R-Line 4 panelboards, switchboards, and motor control centers. It includes standard lugs for 3/0 AWG to 350 kcmil wire. Delivering 200kAIC at 240V, it utilizes thermal-magnetic trip technology with adjustable magnetic settings. The current-limiting design is HACR rated.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | LDC3450 |
| Series | LDC |
| Amperage | 450A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 50kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | LDC |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Pow-R-Line 4 Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | (2) 3/0 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 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, Padlock Attachment |
|---|---|
| Accessories | Line and Load Lugs (TA602LD) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, High Interrupting Capacity, Trip-Free Mechanism, Visual Trip Indicator |
Product FAQs
8 answersWhat types of enclosures or panels is the LDC3450 compatible with?
This L-Frame breaker is designed for use in Eaton Pow-R-Line 4 panelboards, switchboards, and motor control centers. It is a unit mount breaker, meaning it bolts directly to the mounting surface rather than plugging onto a bus.
How does the thermal-magnetic trip unit function on this 450A breaker?
The LDC3450 features an interchangeable thermal-magnetic trip unit with LI (Long-Time and Instantaneous) functions. The thermal element for overload protection is fixed at 450A, while the magnetic element for short-circuit protection is adjustable to coordinate with other devices in the electrical system.
What wire size and material can be used with the standard lugs on the LDC3450?
The standard lugs accept two 3/0 AWG to 350 kcmil conductors per phase. The terminals are rated for both aluminum and copper wire.
Can the LDC3450 replace older Westinghouse or Cutler-Hammer L-Frame breakers?
Yes, Eaton Series C breakers are backward compatible. The LDC3450 can replace older Cutler-Hammer or Westinghouse LDC breakers with the same frame size and specifications.
What does the 200 kAIC rating at 240V mean for installation?
The 200 kAIC rating indicates the maximum fault current the breaker can safely interrupt at 240V AC without sustaining damage. This high interrupting capacity makes it suitable for commercial and industrial systems with high available fault currents. Note that the interrupting capacity drops to 100 kAIC at 480V AC and 50 kAIC at 600V AC.
Can the trip unit in the LDC3450 be swapped for a different amperage?
Yes, the LDC3450 features an interchangeable trip unit design. If the load requirements change, the trip unit can be replaced with a different Series C L-Frame trip unit without having to remove the entire breaker frame from the panelboard.
What safety precautions are required when adjusting the magnetic trip settings?
Adjustments to the magnetic trip settings should only be performed by a qualified electrician. The breaker must be de-energized, and settings should be calculated based on a formal coordination study to ensure proper system protection and arc flash safety.
Does the LDC3450 come with line and load lugs installed?
Yes, this feed-thru circuit breaker typically includes standard line and load lugs. Always verify lug torque specifications in the manufacturer instructions before energizing the panel to prevent thermal issues at the terminations.
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