Siemens LD L-Frame Series (Siemens) Circuit Breakers
The Siemens LD series is an L-Frame molded case circuit breaker rated 125A–600A at 600VAC for large feeder and main circuit protection in industrial and commercial switchboards.
Series Specifications
| Frame | L-Frame — 600A Frame |
|---|---|
| Amperage Range | 125A – 600A |
| Voltage | 600VAC |
| Poles | 2-Pole & 3-Pole |
| Interrupting Rating | 35kA @ 480V |
| Mounting | Fixed |
| Trip Type | Thermal Magnetic |
History and Replacement Context
The LD series was part of the ITE/Gould product line inherited by Siemens in 1978. LD breakers are widely used in industrial switchboards and commercial main distribution panels.
Typical Applications
- Industrial main feeders
- Large commercial distribution
- Switchboard main breakers
- Large motor feeders
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