Siemens HED43B040L - 40 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for demanding electrical distributions, the Siemens HED43B040L is a 40 A, 3-pole bolt-on molded case circuit breaker rated for 480 V. Designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers, it combines rugged mounting with precise protection performance for commercial, light industrial, and residential installations where reliability is non-negotiable.

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection minimizes movement and stress on connections, helping maintain consistent protection even in dynamic panel environments.
• Thermal-magnetic trip unit: offers stable, repeatable protection by combining thermal overload sensing with an instantaneous magnetic trip for high-current fault conditions, reducing nuisance trips while staying responsive to genuine faults.
• 3-pole, 480 V design: ideal for 3-phase distribution scenarios common in commercial spaces and light industrial equipment, delivering coordinated protection across all phases.
• OEM-compatible housing: engineered to fit and function with matching Siemens OEM load centers and panelboards, ensuring smooth installation and reliable long-term performance.
• Versatile applications: suited for panelboards and load centers in residential renovations, commercial electrical rooms, and light industrial distribution networks, where compact, reliable protection matters.

Technical specifications

• Manufacturer: Siemens
• Part Number: HED43B040L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and practical benefits

• Upgrade or retrofit of a 3-phase 480 V panel in commercial buildings, data centers, or light industrial facilities where reliable fault protection is essential.
• New installations in panelboards and load centers that require a compact, bolt-on solution with robust vibration resistance for equipment rooms and mechanical spaces.
• Applications where consistent trip performance across ambient temperature variations is important, thanks to the thermal-magnetic protection profile.

Choosing the Siemens HED43B040L means selecting a breaker designed to align with Siemens’ panelboard ecosystems, offering predictable protection curves, easy installation, and durable operation under real-world conditions. For engineers and electricians prioritizing safety, reliability, and panel compatibility, this 3-pole, 40 A unit is a thoughtfully engineered choice for 480 V distribution tasks.