Siemens HGB3B090B - 90 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens HGB3B090B is a rugged 3-pole, 90A molded case circuit breaker designed to deliver dependable overcurrent and short-circuit protection right where you need it—in panelboards and load centers across residential, commercial, and light industrial settings. Built to handle real-world electrical demands, this bolt-on unit combines precise protection with straightforward installation for fast, reliable service upgrades and new installs.

• Bolt-on mounting for a rigid, vibration-resistant bus connection: engineered to stay secure under normal equipment vibration, reducing the risk of loose connections and arcing over time.
• Thermal-magnetic trip unit: provides stable, repeatable protection by responding to both overloads and short circuits with accurate trip performance, helping minimize nuisance trips while safeguarding circuits.
• OEM-compatible with matching Siemens load centers: designed to work seamlessly with the corresponding panelboards and load centers, making retrofits and new installations smoother and more reliable.
• Broad application range: suitable for residential service upgrades, commercial electrical rooms, and light industrial distribution where dependable branch-circuit protection is essential.
• Thermal-magnetic molded case construction: compact yet robust, offering consistent performance in varied temperatures and environments while delivering dependable protection for your electrical system.

What problems does the HGB3B090B solve? It provides targeted, reliable protection for branch circuits against overloads and short circuits, helping prevent equipment damage, downtime, and electrical fires. The bolt-on design ensures a solid bus connection that resists vibration-related wear, while the thermal-magnetic trip unit delivers precise interruption when thresholds are exceeded. For facility managers and electricians, this means fewer trips, easier maintenance, and a safer, more predictable electrical distribution network.

Key specifications at a glance

• Manufacturer: Siemens
• Part number: HGB3B090B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who is this ideal for? Electricians and facility engineers seeking a dependable, code-consistent protection device for panel upgrades, service box refurbishments, or new installations in spaces where 90 A circuits at up to 600 V are common. Its compatibility with Siemens OEM panels also makes it a practical choice for projects that require cohesive component matching and streamlined approvals.

Practical tips for best results: pair the HGB3B090B with matching Siemens panel components to ensure optimal trip characteristics and protection coordination. Use it in circuits where a stable, repeatable thermal-magnetic response is essential, and where mounting stability is a priority to minimize long-term maintenance concerns.