Eaton / Cutler-Hammer LD Series Circuit Breakers
The Eaton / Cutler-Hammer LD series is an L-Frame molded case circuit breaker rated for 1200A frame size and 600VAC operation. LD breakers cover the 125A to 1200A range for main switchboard applications, large industrial distribution, and service entrance equipment.
Series Specifications
| Frame | L-Frame — 1200A Frame |
|---|---|
| Amperage Range | 125A – 1200A |
| Voltage | 600VAC |
| Poles | 2-Pole & 3-Pole |
| Interrupting Rating | 35kA @ 600V / 65kA @ 480V / 100kA @ 240V |
| Mounting | Bolt-On |
| Trip Type | Thermal Magnetic |
History and Replacement Context
The LD series originated with Cutler-Hammer and continued under the Eaton brand. The L-Frame 1200A rating made it one of the largest standard MCCBs in the Cutler-Hammer lineup.
Typical Applications
- Main switchboard breakers
- Large industrial distribution
- Service entrance equipment
- Large feeder protection
- Industrial plant mains
Available Catalog Numbers
- LD63F300 — 300A, 3 pole, 600VAC
- LD63F350 — 350A, 3 pole, 600VAC
- LD63F400 — 400A, 3 pole, 600VAC
- LD63B400 — 400A, 3 pole, 240/480/600VAC
- LD63B450 — 450A, 3 pole, 240/480/600VAC
- LD63B500 — 500A, 3 pole, 240/480/600VAC
- LD63B600 — 600A, 3 pole, 240/480/600VAC
- LD63F450 — 450A, 3 pole, 600V
- LD63F500 — 500A, 3 pole, 600V
- LD63F600 — 600A, 3 pole, 600V
- LD63B600 — 600A, 3 pole, 600V AC / 500V DC
- LD63B250 — 250A, 3 pole, 600V AC / 250V DC
- LD63B300 — 300A, 3 pole, 600V AC / 250V DC
- LD63B350 — 350A, 3 pole, 600V AC / 250V DC
- LD63B400 — 400A, 3 pole, 600V AC / 250V DC
- LD63F100 — 100A, 3 pole, 240/480/600VAC
- LD63F125 — 125A, 3 pole, 240/480/600VAC
- LD63F150 — 150A, 3 pole, 240/480/600VAC
- LD63F175 — 175A, 3 pole, 240/480/600VAC
- LD63F200 — 200A, 3 pole, 240/480/600VAC