Siemens HED42B090 - 90 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens HED42B090—a rugged 90A, 480V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch-circuit protection in panelboards and loadcenters. Built for challenging electrical environments, this device combines secure mounting, precise protection, and OEM-ready compatibility to keep critical circuits safe and up to code in residential, commercial, and light industrial installations.

Why this 2-pole bolt-on breaker stands out

• Secure bolt-on mounting: A rigid connection to the bus minimizes vibration and movement, reducing wear and ensuring consistent performance over time.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection across a range of operating temperatures, automatically responding to both overload and short-circuit events.
• OEM-ready compatibility: Engineered to work with matching Siemens and other OEM load centers and panelboards, simplifying installation and maintenance in existing systems.
• Versatile application: Specifically suited for 90A circuits at 480V, making it a reliable choice for residential feeders, commercial panels, and light industrial equipment feeds.

Technical snapshot

• Manufacturer: Siemens
• Part Number: HED42B090
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 90A
• Voltage rating: 480V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal for who and where

This breaker is purpose-built for electricians and panel technicians who handle panelboard expansions, retrofits, or replacements in both new construction and service upgrades. It shines in environments where vibration or equipment reliability matters—think facility rooms, commercial spaces, and light industrial settings—where a secure, durable connection matters as much as the protection the device provides.

Practical usage and tips

Use the HED42B090 for safeguarding critical feeders and branch circuits at 480V. Pair it with compatible Siemens or OEM load centers and panelboards to maintain consistent protection coordination across the distribution system. When installing, verify compatibility with the existing bus configuration and ensure the mounting hardware is properly seated to maximize the benefits of the bolt-on design. In service and maintenance scenarios, this unit’s thermal-magnetic trip behavior supports predictable protection during routine load changes and fault events.

What problems it solves

• Prevents damage from overcurrent and short circuits on 480V circuits, safeguarding connected equipment.
• Eliminates loose connections caused by vibration through a secure bolt-on mount, reducing nuisance trips and wear.
• Streamlines upgrades by matching OEM load centers and panelboards, minimizing compatibility concerns.

In short, the Siemens HED42B090 is a purpose-built, installation-friendly solution for reliable 90A protection at 480V—delivering durable performance, precise trip characteristics, and seamless compatibility for a wide range of panelboard and loadcenter configurations.