Westinghouse LD Series (Westinghouse) Circuit Breakers
The Westinghouse 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 and large industrial distribution.
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 Westinghouse LD series was part of the Series C product family, continuing under the Cutler-Hammer brand after the 1994 Eaton acquisition.
Typical Applications
- Main switchboard breakers
- Large industrial distribution
- Service entrance equipment
- Large feeder protection
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