Siemens HED42B100 - 100 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Introducing the Siemens HED42B100, a precision-built 2-pole, 100A molded case circuit breaker designed to deliver reliable overcurrent and short-circuit protection for panelboards and loadcenters. With secure bolt-on mounting, it forms a rigid, vibration-resistant connection at the bus, helping maintain steady protection even in environments with movement or vibration.

Why this breaker stands out

• Secure bolt-on mounting: Ensures a rigid bus connection and minimizes movement in vibration-prone environments.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection for overloads and short circuits, reducing nuisance trips.
• OEM-ready compatibility: Designed to fit matching Siemens OEM loadcenters and panelboards for a seamless installation.
• Versatile across sectors: Suitable for residential, commercial, and light industrial applications where dependable branch-circuit protection is critical.

Technical snapshot

• Manufacturer: Siemens
• Part number: HED42B100
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 100 A
• Voltage rating: 480 V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

In residential or commercial panelboards and loadcenters requiring a robust 480V, 2-pole solution, the HED42B100 serves as the frontline defense against wiring faults. It shines in electrical subsystems, equipment enclosures, and service panels that demand reliable, long-term performance in environments with vibration or mechanical movement.

How it compares to alternatives

This bolt-on MCCB delivers a more rigid connection than lighter-duty or plug-in options, reducing bus-bar movement and potential contact issues over time. The thermal-magnetic trip unit paired with a 100 A rating at 480 V provides strong protection for higher-load circuits in commercial or light industrial settings, ensuring predictable behavior during faults and surges.

Practical tips for installation and use

• Verify your panelboard’s compatibility with a 2-pole, 480 V, 100 A bolt-on breaker labeled HED42B100 before replacing or upgrading.
• Use the thermal-magnetic trip curve to anticipate protection during typical load surges and short circuits, minimizing nuisance trips.
• For cohesive protection, pair with other Siemens HED-series devices that share the same mounting style and trip characteristics.

Specs at a glance

• Type: Thermal-magnetic molded case circuit breaker
• Poles: 2
• Amperage: 100 A
• Voltage: 480 V
• Mounting: Bolt-on
• Application: Branch circuit protection (overcurrent and short-circuit)
• Compatibility: Siemens OEM loadcenters and panelboards