Siemens HEB1B020B - 20 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens HEB1B020B is a purpose-built solution for dependable branch-circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a 20A rating and 277V capability in a compact 1-pole, bolt-on molded case design, it’s ready to guard commercial, residential, and light industrial circuits against faults while fitting neatly into standard Siemens panel builds.

Why this 1-pole bolt-on breaker stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection that stays put even in environments subject to movement or vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection performance. The thermal element handles gradual overcurrent, while the magnetic element responds quickly to short circuits, helping prevent damage to wiring and connected equipment.
• OEM-compatible design is specifically matched for use with Siemens panelboards and loadcenters, ensuring reliable fit, alignment, and electrical continuity.
• Versatile for multiple settings ideal for residential, commercial, and light industrial applications where reliable 20A protection at 277V is needed.

Where and how it shines

Use the Siemens HEB1B020B to protect branch circuits in panelboards and loadcenters that serve lighting, receptacle runs, small motors, HVAC controls, and auxiliary equipment in commercial spaces, or in modern residential systems with higher voltage requirements. The 277V rating broadens its utility for commercial lighting circuits and other 277V distribution scenarios, making it a practical choice for retrofit projects and new builds alike.

Technical snapshot

• Siemens
• Part Number: HEB1B020B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical tips for best results

• Pair this breaker with compatible Siemens panelboards and loadcenters to ensure seamless mechanical fit and electrical performance.
• When installing, ensure the bolt-on connection is tightened to secure, vibration-free contact between the breaker and the busbar to maintain consistent protection behavior.
• Use in circuits where 277V distribution is standard, such as certain commercial lighting and equipment feeds, to maximize protection coverage without overengineering the solution.

Available through AmpState, the Siemens HEB1B020B delivers a reliable, purpose-built protection solution that blends robust mechanical design with precise thermal-magnetic trip performance. Whether you’re upgrading an existing panel or specifying equipment for a new installation, this 20A, 277V, 1-pole bolt-on breaker helps you safeguard circuits with clarity and confidence.