Siemens HED42B020 - 20 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens HED42B020 is a 20A, 480V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Built to withstand vibration and demanding electrical environments, this device is a precise fit for commercial and light industrial installations, while remaining suitable for residential panels that require solid overcurrent protection.

Why the Siemens HED42B020 stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing movement and maintaining reliable electrical contact over time.
• Thermal-magnetic trip unit delivers stable overload protection and fast short-circuit interruption, ensuring consistent performance across temperature variations and duty cycles.
• OEM-ready compatibility designed to work with matching Siemens loadcenters and panelboards, simplifying replacements, upgrades, and system coordination.
• Versatile 20A, 480V, 2-pole configuration suits a range of branch circuits in commercial, industrial, and select residential panel setups that require robust protection at higher voltage.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: HED42B020
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20 A
• Voltage Rating: 480 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal applications and use cases

Choose the Siemens HED42B020 for panel refresh projects, new installations, or upgrades in spaces where 480V availability and reliable 20A protection are essential. It’s well-suited for:

• Commercial electrical panels and light industrial distribution
• Residential and small office panels that require durable, OEM-compatible breakers
• Equipment disconnects and service panels within compliant Siemens systems

Installation tips and practical considerations

• Use with matching Siemens OEM loadcenters and panelboards to ensure seamless fit and optimal electrical performance.
• Secure bolt-on mounting to maintain a solid, vibration-resistant connection and reliable long-term operation.
• Coordinate with upstream protective devices to achieve proper system protection coordination and selectivity.
• For replacements, verify that the circuit’s amperage and voltage requirements align with the 20A, 480V rating and that two-pole protection matches the circuit configuration.

The Siemens HED42B020 delivers precise, repeatable protection for critical branch circuits, combining dependable thermal-magnetic performance with a robust bolt-on design. It’s a practical, future-ready choice for professionals upgrading panel systems or integrating Siemens‑based protection into commercial, light industrial, or select residential deployments.