Siemens CND63B120H Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Unit Mount
Quantity
Siemens CND63B120H - 1200A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Rated for 100% continuous current, the CND63B120H is a 1200A MCCB built for demanding industrial environments. It features a thermal-magnetic trip unit with LI functions, delivering reliable fuseless protection. This ND Frame breaker mounts into Siemens S4, S5, P4, and P5 panelboards, as well as SB1-SB3 switchboards. It requires separate lug kits for up to four 250-500 kcmil conductors per phase. Capable of interrupting 100 kAIC at 480V, this current-limiting MCCB is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Series | CND6 |
| Amperage | 1200A |
| 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 | CND |
|---|---|
| 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, 100% Rated, Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards and switchboards are compatible with the CND63B120H?
This 1200A ND-frame breaker is designed for use in Siemens Sentron series panelboards, specifically types S4, S5, P4, and P5. It is also compatible with Siemens SB1, SB2, and SB3 switchboards, as well as Motor Control Centers.
What does the "C" in the CND63B120H catalog number indicate?
The "C" prefix indicates that this breaker is 100 percent rated. Unlike standard breakers limited to 80 percent continuous load, the CND63B120H can carry its full 1200A nameplate current continuously when installed in an approved enclosure.
How many conductors per phase do the standard lugs on this breaker accept?
The standard lugs on the CND63B120H accommodate four conductors per phase. The accepted wire range is 250 to 500 kcmil for both copper (Cu) and aluminum (Al) conductors.
How does the adjustable magnetic trip function work on this breaker?
The CND63B120H features a thermal-magnetic trip unit with a fixed thermal and adjustable magnetic setting (LI). The adjustable instantaneous pickup allows electricians to fine-tune the short-circuit response to coordinate with downstream devices and prevent nuisance tripping from motor inrush currents.
Is the Siemens CND63B120H suitable for direct current (DC) systems?
Yes, in addition to its AC ratings, this breaker is rated for use in DC applications up to 500VDC, where it provides an interrupting capacity of 50kAIC.
Is the CND63B120H considered a current-limiting circuit breaker?
Yes, this Sentron series breaker is current-limiting. It is designed to quickly interrupt high fault currents, reducing the let-through energy to protect downstream electrical equipment from severe thermal and mechanical stress.
How is the CND63B120H mounted inside a panel?
This is a unit-mount, bolt-on circuit breaker. It bolts directly to the bus or mounting pan in compatible Siemens enclosures rather than snapping into place, ensuring a secure and reliable connection for high-amperage applications.
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