Siemens HED43B045L - 45 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered for dependable, high-performance protection in commercial and light industrial power distribution, the Siemens HED43B045L is a 45A, 480V, 3-pole bolt-on molded case circuit breaker. Designed to safeguard branch circuits in panelboards and load centers, it delivers durable operation, crisp trips, and a secure connection that stands up to vibration and demanding environments.

Key benefits that matter in the field

• Secure bolt-on mounting: A rigid bus connection minimizes movement and vibration, helping maintain consistent electrical contact and reducing the risk of loose connections over time.
• Thermal-magnetic trip unit: Combines precise overload protection with fast short-circuit interrupting capability, delivering stable, repeatable protection across varying loads and fault conditions.
• Three-pole, 480V design: Ideal for three-phase distribution in commercial or light industrial settings, handling higher voltage systems with confidence and safe fault isolation.
• OEM-friendly compatibility: Engineered to integrate with matching Siemens and OEM load centers and panelboards, ensuring a seamless fit and reliable performance out of the box.
• Versatile applications: Suitable for residential, commercial, and light industrial installations where robust branch-circuit protection is required.

Specifications at a glance

• Manufacturer: Siemens
• Part number: HED43B045L
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage rating: 45A
• Voltage rating: 480V
• Poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and deployment scenarios

The HED43B045L is well-suited for panelboards and load centers in commercial spaces such as offices, retail facilities, data rooms, and light industrial environments. Use it to protect motor feeders, lighting and receptacle circuits, or any three-phase distribution path where 480V availability necessitates reliable protection. Its bolt-on design is especially advantageous in installations where vibration resistance and long-term connection integrity are priorities, such as equipment rooms, mezzanines, or outdoor enclosures subject to environmental movement.

Installation and compatibility tips

• Verify the breaker is compatible with your panelboard’s model and bus arrangement before installation.
• Use the recommended mounting hardware and tighten to the panelboard manufacturer’s specified torque to ensure a secure, vibration-resistant connection.
• Follow all applicable electrical codes and the panelboard’s installation guidelines when integrating this MCCB into a power distribution scheme.
• Pair with matched Siemens or OEM load centers to maintain coordinated protection and electrical performance.

Why this Siemens breaker stands apart

• Designed for durability in demanding environments, with a bolt-on format that maintains solid electrical contact even under vibration or movement.
• Thermal-magnetic protection delivers fast, predictable tripping for short circuits while preventing nuisance trips during normal loading fluctuations.
• Three-pole, 480V capability makes it a strategic choice for higher-voltage three-phase systems commonly found in commercial and light industrial facilities.
• Seamless OEM compatibility ensures a reliable fit with Siemens and compatible load centers, reducing retrofit complexity and unnecessary modifications.