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Siemens NXD63B120H Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Bolt-On
Siemens
NXD63B120H
Molded Case Circuit Breaker
Brand
Siemens
SKU
NXD63B120H
Quantity
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Siemens NXD63B120H - 1200A 3 Pole Molded Case Circuit Breaker
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Description
Designed to carry its full rated current continuously, the Siemens NXD63B120H is a 100% rated 1200A molded case circuit breaker. It is engineered for industrial environments requiring maximum continuous power delivery. This ND-frame breaker installs into Siemens P4 and P5 panelboards, switchboards, and motor control centers. It features a bolt-on mounting style for reliable integration into distribution equipment. Rated at 65kAIC at 240VAC, it includes a non-interchangeable trip unit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NXD63B120H |
| Series | NXD6 |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | NXD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4 Panelboards, Siemens P5 Panelboards, Switchboards, Motor Control Centers |
| 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, Mechanical Lugs, Compression Lugs |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip, 100% Rated |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens NXD63B120H?
The NXD63B120H mounts directly into Siemens P4 and P5 panelboards, as well as switchboards and Motor Control Centers (MCCs) designed to accept Sentron ND-frame bolt-on circuit breakers.
What do the letters 'H' and 'NXD' indicate in the NXD63B120H catalog number?
In the Siemens Sentron series, the 'NXD' prefix identifies the physical ND frame size. The 'H' suffix designates a high interrupting rating, providing 65kA at 240V AC and 50kA at 480V AC, which exceeds standard NXD breaker ratings for more demanding fault current requirements.
What type of wire terminals are required for this 1200A breaker?
The NXD63B120H uses a standard lug terminal configuration. Because 1200A installations typically require multiple parallel conductors per phase, you must source specific ND-frame mechanical or compression lug kits that match your cable gauge and material.
How does the trip unit operate on the NXD63B120H?
This breaker features a thermal-magnetic trip unit with LI (Long-Time and Instantaneous) functions. The thermal trip is fixed at the 1200A rating, while the magnetic instantaneous trip is adjustable, allowing installers to tune short-circuit protection to the specific load profile.
Are DC power systems supported by the NXD63B120H?
Yes. While typically deployed in standard 3-phase AC distribution up to 600V, this 3-pole breaker is also rated for 500V DC with a 25kA interrupting capacity, supporting heavy industrial DC power applications.
Can the NXD63B120H replace older Siemens or ITE 1200A breakers?
Yes. The NXD63B120H shares the standard ND frame footprint and bolt-on mounting configuration. It is commonly used as a direct upgrade or replacement for legacy Siemens and ITE ND6, HND6, and CND6 1200A circuit breakers in existing electrical infrastructure.
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