Siemens CND63B900 Molded Case Circuit Breaker
- 900A
- 3 Pole
- Unit Mount
Quantity
Siemens CND63B900 - 900A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Part of the Sentron family, this 900-amp molded case circuit breaker provides reliable long-time and instantaneous (LI) protection for demanding industrial environments. The unit-mount design integrates seamlessly into Siemens S4, S5, P4, and P5 panelboards, as well as SB-series switchboards and motor control centers. Featuring a high interrupting capacity of 100kA at 480VAC, this current-limiting ND-frame device ensures robust fault clearing without requiring external fusing.Specifications
| Brand | Siemens |
|---|---|
| Series | CND6 |
| Amperage | 900A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 65kA @ 600VAC, 50kA @ 500VDC |
| Frame Type | ND |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards (S4, S5, P4, P5), Switchboards (SB1, SB2, SB3), Motor Control Centers |
| Wire Gauge | (4) 250-500 kcmil (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 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Non-Interchangeable Trip |
Product FAQs
10 answersWhat equipment is compatible with the Siemens CND63B900 breaker?
This ND-frame breaker is designed for use in Siemens Sentron S4, S5, P4, and P5 panelboards, as well as SB1, SB2, and SB3 switchboards and compatible motor control centers.
What wire sizes are accepted by the lugs on the CND63B900?
The standard lugs for this 900A breaker accept four 250 to 500 kcmil conductors per phase, and are rated for both copper (Cu) and aluminum (Al) wire.
How does the trip unit operate on the CND63B900?
It features a thermal-magnetic trip unit with fixed thermal (long-time) protection and an adjustable magnetic (instantaneous) trip setting to coordinate with downstream devices.
Can the CND63B900 be used in DC applications?
Yes, this breaker is rated for use in direct current systems up to 500VDC, where it provides an interrupting capacity of 50kA.
What does the "C" in the CND63B900 catalog number indicate?
In the Siemens Sentron series, the "C" prefix designates a current-limiting circuit breaker with a high interrupting capacity. The CND63B900 provides up to 100kAIC at 480V and 65kAIC at 600V.
Can the CND63B900 be reverse fed?
Yes, because the CND63B900 features a factory-installed, non-interchangeable trip unit, it is suitable for reverse-feed applications in accordance with UL 489 requirements.
Is the trip unit on the CND63B900 interchangeable?
No, the CND63B900 comes with a factory-installed, non-interchangeable thermal-magnetic trip unit.
How does the CND63B900 connect to the panel bus?
The CND63B900 is a unit-mount, bolt-on circuit breaker. It fastens directly to the busbars in compatible Siemens panelboards and switchboards for a secure electrical connection.
What frame size is the Siemens CND63B900?
The CND63B900 is built on the Siemens Sentron ND frame, a robust molded case platform that supports amperages up to 1200A.
Does the CND63B900 provide ground fault protection?
No, the CND63B900 is equipped with a standard thermal-magnetic trip unit that provides long-time and instantaneous (LI) overcurrent protection. It does not include integrated ground fault protection.
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