Siemens HED43B040 - 40 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens HED43B040 is a 40A, 480V, 3-pole bolt-on molded case circuit breaker engineered to deliver reliable branch circuit protection in panelboards and loadcenters. It combines a rugged bolt-on mounting system with a thermal-magnetic trip unit, delivering stable protection that adapts to real-world load conditions and fault events.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, ensuring consistent electrical performance in environments with constant movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to sustained overloads and sudden short circuits with predictable trip characteristics.
• OEM-compatible design is engineered to mate with matching Siemens panelboards and loadcenters, supporting hassle-free installation and dependable long-term operation.
• Three-pole configuration isolates each phase in three-phase systems, promoting balanced protection across all conductors.
• 40A at 480V makes it suitable for mid-range commercial and light industrial applications, including distribution panels, motor control centers, and HVAC or processing equipment.
• Durable molded-case construction offers compact, space-efficient protection without compromising reliability in busy electrical rooms.

Ideal use cases

• Replacing aging or failed breakers in Siemens panelboards and loadcenters to restore reliable power protection.
• New installations in three-phase 480V systems for commercial facilities, light manufacturing, or large mechanical equipment.
• Control panel assemblies that require rugged mounting and consistent trip performance under varying load conditions.

What you gain with the HED43B040

• Predictable fault interruption that minimizes exposure to arcing and downstream damage.
• Unified protection behavior when paired with other Siemens devices in the same OEM ecosystem, reducing compatibility concerns.
• Long-term reliability in environments where vibration or mechanical stress is a factor, thanks to the bolt-on bus connection.

Technical snapshot

• Manufacturer: Siemens
• Part number: HED43B040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 480V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

With Siemens HED43B040, you’re choosing a trusted solution built to align with Siemens’ panelboard families, delivering consistent performance, easier maintenance, and a clear path to reliable electrical protection for commercial and light industrial environments.