Siemens HFD63B175 - 150 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HFD63B175—a robust 3-pole bolt-on molded case circuit breaker designed to safeguard your electrical system with precision and reliability. Rated for 150A at up to 600V, this breaker is purpose-built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers, keeping the heartbeat of your electrical installation steady when demand spikes occur.

• Secure bolt-on mounting: Delivers a rigid, vibration-resistant bus connection, reducing movement-induced wear and ensuring consistent performance in commercial and light industrial environments.
• Thermal-magnetic trip unit: Provides stable, repeatable protection by combining thermal overload sensing with an instantaneous magnetic trip for short circuits—minimizing nuisance trips while guarding wiring and equipment.
• 3-pole design: Ideal for 3-phase circuits, making it well-suited for commercial lighting, small motors, and distribution panels that require balanced protection across phases.
• High compatibility: Engineered to pair with matching OEM load centers and panelboards, simplifying replacements or upgrades without compatibility surprises.
• Versatile applications: Suitable for residential, commercial, and light industrial installations where reliable protection and quick serviceability are essential.

Why this matters in real-world use: a bolt-on molded case breaker like the HFD63B175 not only blocks excessive current, it also maintains a tight, vibration-resistant connection that minimizes intermittent faults in demanding environments. The thermal-magnetic trip ensures a fast, clean response to short circuits while avoiding unnecessary trips during normal operation, helping protect conductors, devices, and downstream equipment.

Use cases and scenarios

• New panel installations in commercial spaces where 3-phase circuits require dependable protection and a secure mounting method.
• Repairs or upgrades in OEM load centers that specify bolt-on breakers for a seamless fit and reliable bus connections.
• Light industrial applications with variable loads and occasional vibration, where mechanical stability and fast protection are critical.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HFD63B175
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 150A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Whether you’re upgrading a panelboard to support higher demand, replacing a failed unit, or specifying components for a new installation, the Siemens HFD63B175 delivers the trusted protection, mechanical stability, and compatibility you need to keep electrical systems running safely and efficiently.