Siemens ND63B900 Molded Case Circuit Breaker
- 900A
- 3 Pole
- Unit Mount
Quantity
Siemens ND63B900 - 900A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens ND63B900 - 900A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | ND63B900 |
| Series | ND6 |
| Amperage | 900A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | ND |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 Switchboards |
| 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, Undervoltage Release, Auxiliary Switch, Alarm Switch, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Line and Load Lugs (TA4N8500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Quantity
Siemens ND63B900 - 900A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | ND63B900-R |
| Series | ND6 |
| Amperage | 900A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | ND |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 Switchboards |
| 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, Undervoltage Release, Auxiliary Switch, Alarm Switch, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Line and Load Lugs (TA4N8500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Description
Designed for demanding industrial applications, the 900A Siemens ND63B900 provides robust thermal-magnetic overcurrent defense. It is engineered to mount into P5 panelboards and SB-series switchboards, offering flexible integration for commercial power distribution. The interchangeable trip unit includes adjustable magnetic settings for tailored short-circuit response. Rated for 50kA at 480VAC, this legacy Sentron frame is officially superseded by the NXD63B900 for newer installations.Specifications
| Brand | Siemens |
|---|---|
| Part Number | ND63B900-R |
| Series | ND6 |
| Amperage | 900A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 500VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 25kA @ 500VDC |
| Frame Type | ND |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 Switchboards |
| 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, Undervoltage Release, Auxiliary Switch, Alarm Switch, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Line and Load Lugs (TA4N8500) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
8 answersWhat equipment is compatible with the ND63B900 breaker?
This unit-mount breaker is designed for installation in Siemens P5 panelboards, as well as SB1, SB2, and SB3 switchboards. It is commonly used for heavy commercial and industrial power distribution.
What are the standard lug wire size requirements?
The factory-installed lugs accept up to four 250 to 500 kcmil copper or aluminum conductors per phase. Ensure proper torque specifications are followed during installation to prevent loose connections.
How does the LI trip unit function on this model?
The LI designation indicates thermal-magnetic protection with fixed long-time (thermal) and adjustable instantaneous (magnetic) trip settings. It does not include short-time or ground fault functions.
Can the ND63B900 be utilized in DC circuits?
Yes, this breaker is rated for DC applications up to 500VDC, providing a 25kA interrupting capacity for direct current systems such as solar installations or battery backups.
Does the ND63B900 provide ground fault equipment protection?
No, this specific model features an LI trip unit. If ground fault protection is required, a breaker with an LIG or LSIG trip unit, or an external ground fault relay system, must be used.
What frame family does this breaker belong to?
It is part of the Siemens SENTRON ND frame series. When replacing an older ND frame breaker, verify that the physical dimensions and lug configurations match your existing enclosure.
How is the ND63B900 mounted within an enclosure?
It is a unit-mount, feed-thru circuit breaker. It bolts directly to the mounting pan or chassis rather than plugging onto a busbar system, making it ideal for standalone enclosures or custom panels.
What is the difference between the ND63B900 and a solid-state breaker?
The ND63B900 uses thermal-magnetic trip technology, which relies on a bimetallic strip for overload protection and an electromagnet for short circuits. Solid-state breakers use electronic microprocessors for more precise, highly adjustable protection curves.
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