Siemens HNX3B800L - 800 A, 3-Pole Circuit Breaker | AmpState

Engineered for dependable protection in demanding electrical setups, the Siemens HNX3B800L is an 800A, 3-pole molded case circuit breaker designed to guard branch circuits against overloads and short circuits in panelboards and loadcenters.

Key benefits and features

• Space-efficient design: a compact molded case format that maximizes usable panel space without compromising performance.
• Thermal-magnetic trip unit: provides stable, repeatable protection by marrying thermal overload sensing with fast magnetic tripping for short circuits.
• Rugged reliability: built to endure in residential, commercial, and light industrial environments with consistent trip characteristics.
• Seamless compatibility: engineered to be compatible with matching Siemens OEM load centers and panelboards for straightforward upgrades and replacements.
• High current capability: 800A rating makes it suitable for large feeder protection and demanding branch circuits.

What this means in practice

Use the Siemens HNX3B800L as the main protection device in a panelboard or loadcenter where a single 3-pole MCCB must guard a three-phase circuit at up to 800A. Its compact footprint helps you fit it into crowded electrical rooms or limited cabinet spaces, while the thermal-magnetic trip keeps nuisance trips low and protection precise during both steady overloads and sudden faults.

Applications and use cases

• Three-phase commercial lighting and power distribution panels that require reliable 800A protection
• Industrial equipment feeders and machinery panels needing robust short-circuit protection
• Upgrades or replacements in Siemens OEM panels where exact-fit MCCBs ensure compatibility and continuity
• Residential-to-light-industrial installations with demanding load profiles where space is at a premium

Technical snapshot

• Manufacturer: Siemens
• Part number: HNX3B800L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 800A
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens HNX3B800L means prioritizing dependable protection, panel space efficiency, and straightforward integration with existing Siemens panel ecosystems. If you’re upgrading a panelboard or load center that demands reliable 3-pole, 800-amp protection, this MCCB delivers a precise, durable solution that electricians trust for long-term performance.