Siemens HED42B045 - 45 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens HED42B045 is a 45A, 480V, 2-pole bolt-on molded case circuit breaker engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. This unit brings robust reliability to commercial, light industrial, and certain residential applications where 480V distribution is standard.

Why this bolt-on breaker stands out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection. In environments with equipment vibration or temperature cycling, this design maintains consistent electrical contact and reduces the risk of loose connections over time.
• Thermal-magnetic trip unit provides stable, repeatable protection. The thermal element guards against nuisance overloads, while the magnetic element delivers a fast, decisive response to short circuits, helping minimize equipment damage.
• 2-pole design ensures simultaneous disconnection of both hot legs, delivering coordinated protection for 2‑pole circuits and multi-wire branch circuits common in higher‑voltage panel installations.
• OEM compatibility is crafted for seamless integration with matching Siemens OEM load centers and panelboards, simplifying replacements, upgrades, and maintenance schedules.
• Versatile application suited for residential, commercial, and light industrial electrical distribution where reliable 480V protection is required.

Key specifications at a glance

• Manufacturer: Siemens
• Part number: HED42B045
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 45A
• Voltage rating: 480V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

In commercial electrical rooms or industrial control panels where 480V distribution is standard, the Siemens HED42B045 serves as a dependable line‑side protection device for feeders and critical branch circuits. It’s an excellent choice for:

• Panelboards and load centers that require rugged, vibration‑resistant switching and reliable trip behavior
• Mid‑to‑large commercial installations with frequent motor loads and lighting circuits
• Light industrial panels where 2‑pole protection ensures coordinated disconnection of both conductors
• Retrofits or replacements in Siemens‑equipped systems that demand exact compatibility and performance

Practical considerations and tips

• Verify panelboard compatibility before installation to ensure the bolt‑on connection and trip characteristics align with existing equipment.
• Opt for this unit when you need strong vibration resistance and repeatable protection across varying environmental conditions.
• Consider the load profile and fault current of your system to capitalize on the thermal and magnetic trip features—this helps avoid nuisance trips while still delivering prompt protection during faults.
• For installers and facilities teams, this breaker pairs well with Siemens‑supplied load centers for streamlined maintenance and reliable long‑term operation.

Designed for professionals who demand durability, precise protection, and OEM‑grade compatibility, the Siemens HED42B045 delivers consistent performance across a range of 480V circuits. Add it to your electrical distribution lineup through AmpState for a dependable, industry‑standard solution that protects people, equipment, and productivity.