Siemens B390HH - 90 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B390HH is a 90A, 240V, 3-pole bolt-on molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Its robust construction and precise protection features make it a reliable choice for ensuring power reliability in a variety of electrical setups.

Why the Siemens B390HH stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant connection to the bus, reducing loosening risks in demanding environments.
• Thermal-magnetic trip unit provides stable, repeatable protection performance, responding to both sustained overloads and sudden shorts.
• 3-pole configuration ideal for three-phase circuits common in commercial and light industrial applications.
• Compatibility with OEM load centers ensures seamless integration with matching Siemens load centers and panelboards.
• Versatile application suitable for residential, commercial, and light industrial protection needs.

Where it fits best

• Protects branch circuits in panelboards and loadcenters, preventing damage from overcurrent and short circuits.
• Great for upgrades or replacements in existing Siemens OEM systems, ensuring consistent performance and fit.
• Perfect for 3-phase installations that demand reliable protection and durable mounting.

Key specifications

• Manufacturer: Siemens
• Part Number: B390HH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 90A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips and use cases

When integrating the Siemens B390HH into a panelboard or loadcenter, rely on its thermal-magnetic trip to handle typical overloads and fast magnetic trips for short circuits. It’s a solid choice for protecting 3-phase equipment, motors, and other loads in commercial spaces or light industrial setups, while still fitting neatly into residential-oriented distribution boards that require robust protection and reliable mounting.

If you’re maintaining consistency across your electrical distribution, using the B390HH with compatible OEM Siemens load centers ensures predictable performance, straightforward installation, and long-term reliability. This breaker is built to handle everyday demand, reduce nuisance trips, and safeguard critical circuits from damage due to overcurrent and short circuits.