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Siemens NMX3B800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Siemens
NMX3B800
Molded Case Circuit Breaker
Brand
Siemens
SKU
NMX3B800
Quantity
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Siemens NMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
New
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Siemens NMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | NMX3B800 |
| Series | NMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens VL Series Enclosures, P4/P5 Panelboards, Switchboards |
| 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, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, N-Class Interrupting |
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Siemens NMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | NMX3B800-R |
| Series | NMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens VL Series Enclosures, P4/P5 Panelboards, Switchboards |
| 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, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, N-Class Interrupting |
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Description
Built for heavy-duty industrial applications, the Siemens NMX3B800 is a 3-pole, 800A molded case circuit breaker. It delivers reliable overcurrent protection for high-capacity systems. This unit mount MCCB installs into Siemens VL Series enclosures, P4/P5 panelboards, and switchboards. It serves as a legacy replacement, with the 3VA6580-5HL32-0AA0 acting as its modern electronic trip equivalent.Specifications
| Brand | Siemens |
|---|---|
| Part Number | NMX3B800 |
| Series | NMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | MD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens VL Series Enclosures, P4/P5 Panelboards, Switchboards |
| 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, Motor Operator, Rotary Handle |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, IEC, NOM, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, N-Class Interrupting |
Product FAQs
6 answersWhich panelboards and enclosures accommodate the Siemens NMX3B800?
This 800A circuit breaker is designed for installation in Siemens VL Series enclosures, P4 and P5 panelboards, and compatible Siemens switchboards.
How is this circuit breaker mounted into the distribution system?
The NMX3B800 is a unit mount, bolt-on circuit breaker that fastens directly to the bus or mounting pan inside the panelboard or switchboard.
What wire size range is supported by the terminal lugs for this breaker?
When paired with standard Siemens 3TA3MG500 lug kits, the breaker accepts 1/0 AWG to 500 kcmil copper or aluminum (Cu/Al) conductors.
How is the thermal-magnetic trip unit configured on the NMX3B800?
The non-interchangeable trip unit features a fixed thermal setting for long-time overload protection and an adjustable magnetic setting for instantaneous short-circuit protection.
Is this molded case circuit breaker suitable for reverse-feed installations?
Yes, the NMX3B800 thermal-magnetic circuit breaker is approved for reverse-feed applications.
What is the recommended modern replacement for this legacy circuit breaker?
For current system upgrades, this legacy 800A breaker is generally superseded by the Siemens 3VA6 series of electronic trip circuit breakers, specifically the 3VA6580 models.
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