Siemens HFXD63B070 - 70 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens HFXD63B070 is a 70 A, 600 V, 3-pole bolt-on molded case circuit breaker built to guard panelboards and load centers from overcurrent and short-circuit events. The bolt-on design delivers a secure, vibration-resistant connection to the bus, ensuring reliable operation in demanding installations—from residential service panels to commercial setups.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing the risk of loose contacts in environments with movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by coordinating thermal and magnetic response to overcurrent and short circuits, helping prevent nuisance trips while staying fast when faults occur.
• 3-pole, 70 A, 600 V configuration is ideal for 3-phase systems and higher power circuits common in commercial and light industrial applications.
• OEM-compatible design works with matching Siemens OEM load centers and panelboards, simplifying replacements, upgrades, and maintenance projects.
• Versatile applications suited for residential, commercial, and light industrial environments where dependable branch-circuit protection is essential.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: HFXD63B070
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and installation scenarios

• Upgrading or retrofitting panels in residential or light commercial settings where a reliable 3-phase protection device is required.
• Replacement in existing Siemens panelboards to maintain compatibility and electrical coordination with OEM components.
• Protection for distribution circuits feeding motors, HVAC equipment, or other loads where consistent thermal-magnetic protection minimizes unexpected outages.
• New installations in offices, retail spaces, and small warehouses where a robust bolt-on breaker reduces wire management issues and improves panel integrity.

Why this breaker stands out

• Durable bolt-on design provides superior mechanical stability in panels subject to vibration, thermal cycling, or movement.
• Thermal-magnetic protection offers precise tripping thresholds, helping you avoid nuisance trips while still delivering fast response to faults.
• Clear compatibility with Siemens OEM load centers and panelboards simplifies sourcing and ensures cohesive performance across the electrical system.
• Specifically suited for 3-phase environments, making it a practical choice for structures and applications that require reliable multi-pole protection at 600 V.