The Siemens LD63B400 is a 400-amp, 3-pole, 600V L-Frame (LD) molded case circuit breaker from the Sentron Series. The LD frame is a 600-amp frame covering 400 to 600 amps, featuring an interchangeable thermal-magnetic trip unit with 35kAIC interrupting rating at 480V and 65kAIC at 240V. The LD63B400 ships assembled with aluminum/copper lugs and is used as a main breaker or large feeder protection device in industrial and commercial switchboards and panelboards. It is compatible with Siemens NEMA-type switchboards and is a direct replacement for legacy ITE LD units.
| Specification | Value |
|---|---|
| Amperage | 400A |
| Poles | 3 |
| Voltage | 240/480/600VAC |
| Interrupt Rating | 65kA @ 240V · 35kA @ 480V · 25kA @ 600V |
| Frame Size | L-Frame (600A Frame) |
| Mounting Type | Bolt-On |
| Trip Type | Thermal Magnetic |
| Trip Function | LI — Long-Time, Instantaneous |
| Wire Size | 500–750 kcmil (Cu/Al) |
| Phase | 3-Phase |
| Standards | UL 489, CSA C22.2 No.5 |
| Temperature Rating | -25°C to 70°C |
Replaces: ITE LD63B400
Siemens LD L-Frame 400A 3-pole circuit breaker. In stock at AllBreakerSales.com. Call (877) 611-0034 for same-day pricing. Genuine OEM parts, ships from US warehouse.
Brand: Siemens | Series: LD L-Frame | Catalog Number: LD63B400
LD63B450 - Siemens LD L-Frame | LD63B500 - Siemens LD L-Frame | LD63B600 - Siemens LD L-Frame | LD63F400 - Siemens LD L-Frame | HLD63B400 - Siemens HLD High-AIC L-Frame