Siemens ND63B800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Panel Mount
Quantity
Siemens ND63B800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
The Siemens ND63B800 molded case circuit breaker is built to protect circuits against overloads and short circuits. It is rated for 800A and 50/60Hz, with 3 poles and 3-phase configuration. This ND-Frame breaker uses thermal magnetic tripping. Its LI trip function provides long-time and instantaneous protection. Thermal tripping responds to overloads, while magnetic tripping responds to short circuits.Specifications
| Brand | Siemens |
|---|---|
| Part Number | ND63B800 |
| Series | ND6 |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | ND |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards and Switchboards |
| Wire Gauge | 250-500KCM (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Standards | UL 489 |
|---|---|
| Approval | IEC, UL |
| Temp Rating | 40C |
Product FAQs
7 answersHow should I use the Siemens ND63B800's 800A rating when selecting it?
The Siemens ND63B800 has an 800A rated current. Use that rating when checking the circuit's calculated load and conductor ampacity so the breaker selection supports the circuit's load and protection requirements.
What circuit voltages can this breaker be selected for?
Its voltage ratings are 240VAC, 480VAC, 600VAC and 500VDC. Select using the rating for the circuit's voltage and whether the circuit is AC or DC.
How do I check whether its interrupting rating is adequate?
The interrupting rating is 50kAIC at 480V and 25kAIC at 600V. Compare the rating at your circuit voltage with the available fault current at the installation point; the available fault current must not exceed that rating.
How does the thermal-magnetic LI trip work, and what can I adjust?
LI means long-time and instantaneous protection. The thermal element responds to sustained overloads, while the magnetic element responds to high-current faults. Thermal protection is fixed; the magnetic trip threshold is adjustable for protection coordination.
What conductors can I terminate at the line and load connections?
The line and load connections use lugs, with a conductor range of 250 to 500KCM for copper or aluminum. Choose conductors within that range while also meeting the circuit's ampacity requirements.
How does the pole count guide circuit selection?
The breaker has three poles for three-phase circuits. Each phase conductor passes through a separate pole so the breaker can protect all three phases.
How should I check the frequency rating for an AC application?
Compare the AC system frequency with the breaker's 50/60Hz rating. Frequency is a selection criterion alongside circuit voltage, rated current and interrupting rating.
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