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Siemens HMX3B800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Siemens
HMX3B800
Molded Case Circuit Breaker
Brand
Siemens
SKU
HMX3B800
Quantity
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Siemens HMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
New
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Siemens HMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
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| Brand | Siemens |
|---|---|
| Part Number | HMX3B800-R |
| Series | HMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 25kA @ 250VDC, 50kA @ 500VDC |
| Frame Type | HMD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 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, Lug Kits, Rotary Handle, Motor Operator |
|---|---|
| Accessories | Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip, Reverse Feed |
Quantity
Siemens HMX3B800 - 800A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Series | HMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 25kA @ 250VDC, 50kA @ 500VDC |
| Frame Type | HMD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 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, Lug Kits, Rotary Handle, Motor Operator |
|---|---|
| Accessories | Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip, Reverse Feed |
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800A 3 Pole Molded Case Circuit Breaker
800A 3 Pole Molded Case Circuit Breaker
Description
The Siemens HMX3B800 is a 3-pole, 800A molded case circuit breaker designed for commercial and industrial power systems. It serves as a modern VL Series replacement for older HMD63B800 breakers, though panel modifications may be required. This MG frame unit mounts into Siemens P5 panelboards, SB1, SB2, and SB3 switchboards. Equipped with a non-interchangeable thermal-magnetic trip unit, it provides reliable long-time and instantaneous (LI) protection with a 65kAIC rating at 480V.Specifications
| Brand | Siemens |
|---|---|
| Series | HMX |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 25kA @ 250VDC, 50kA @ 500VDC |
| Frame Type | HMD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P5 Panelboards, SB1, SB2, SB3 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, Lug Kits, Rotary Handle, Motor Operator |
|---|---|
| Accessories | Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Non-Interchangeable Trip, Reverse Feed |
Product FAQs
6 answersWhich Siemens enclosures are compatible with the HMX3B800?
This breaker is designed to mount in Siemens P5 panelboards, SB1, SB2, and SB3 switchboards, as well as compatible motor control centers.
Are the trip settings on the HMX3B800 adjustable?
Yes. While the thermal protection for long-time overloads is fixed at 800A, the magnetic instantaneous trip function is adjustable. This allows you to fine-tune the short-circuit response for better coordination with other protective devices.
Can the HMX3B800 be used in DC power systems?
Yes, this breaker is rated for both AC and DC applications. It provides an interrupting capacity of 25kAIC at 250VDC and 50kAIC at 500VDC, making it suitable for industrial DC control panels and battery systems.
What type of fault protection does the HMX3B800 provide?
It features a thermal magnetic trip unit with Long-Time and Instantaneous (LI) functions. The thermal element protects against sustained overloads, while the magnetic element provides immediate tripping during short-circuit events.
How does the HMX3B800 connect to the busbar?
It features a bolt-on connection for secure unit mounting. When installing it into a P5 panelboard or SB switchboard, you will need the specific strap kit or mounting hardware designed for your exact enclosure.
Can the HMX3B800 replace an older HMD63B800 breaker?
Yes, the HMX3B800 serves as a modern replacement for the legacy HMD63B800. Because it is an updated design, some panel modifications or different mounting hardware may be required when retrofitting older enclosures.
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