Siemens HED43B090 - 90 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HED43B090, a 90A, 480V, 3-pole bolt-on molded case circuit breaker built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. This bolted, mechanically secure design pairs with matching Siemens OEM load centers to deliver a clean, reliable protection solution for demanding electrical environments.

Key features you can trust:

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing the risk of loose connections and nuisance trips in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection by addressing both overload conditions and instantaneous short circuits, helping to minimize downtime and protect connected equipment.
• 3-pole, 480V operation designed for three-phase systems common in commercial and light industrial settings, enabling balanced protection across all phases.
• OEM compatibility engineered to align with matching Siemens load centers and panelboards for straightforward installation and reliable performance.
• Versatile applications suitable for residential, commercial, and light industrial environments where robust branch-circuit protection is essential.

Technical specifications

• Manufacturer: Siemens
• Part Number: HED43B090
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 90 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this Siemens HED43B090 stands out

• Designed for reliable, long-term protection in panelboards and load centers, with a mounting method that minimizes vibration-related issues.
• Thermal-magnetic trip behavior translates to predictable responses across a range of fault currents, helping protect both equipment and wiring from damage.
• Three-pole configuration ensures synchronized protection across all phases in 480V systems, improving protection integrity for motors, business-critical circuits, and distribution panels.
• OEM-compatible construction means installation is streamlined, reducing commissioning time and compatibility concerns with existing Siemens gear.

Ideal for professionals upgrading or expanding electrical infrastructure, the Siemens HED43B090 delivers direct, purpose-built protection for 3-phase, 480V circuits. Whether you’re panel-lining a commercial storefront, equipping a small industrial service, or updating a residential-commercial mixed-use panel, this bolt-on MCCB provides clear, decisive protection with construction-grade reliability.