Siemens HB3B030 - 30 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens HB3B030 — a 30A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and loadcenters. Available from AmpState. With secure bolt-on mounting, this unit creates a rigid, vibration-resistant bus connection that stays tight in demanding environments.

The thermal-magnetic trip unit provides stable, repeatable protection: the thermal element handles overloads with precision, while the magnetic element delivers an instantaneous response to short circuits, minimizing damage and downtime.

Key benefits that matter in the real world

• Bolt-on mounting for a rigid bus connection — minimizes movement and arcing, improving long-term protection and reliability.
• Thermal-magnetic trip unit — balances nuisance-free operation with fast interruption during severe faults.
• 3-pole, 30A at 240V — ideal for 3-phase or 240V branch circuits commonly found in panels and equipment rooms.
• Molded-case design — compact, robust construction that fits standard panel spaces and simplifies serviceability.
• OEM panel compatibility — engineered to pair with matching Siemens OEM load centers and panelboards for a seamless, code-compliant install.

Who should consider this breaker?

Electricians working on residential, commercial, or light industrial electrical systems will appreciate the combination of reliable protection and ease of installation. It’s ideal for feeding subpanels, protecting large 240V circuits, or upgrading older panelboards that require a known, compatible 3-pole solution.

Technical snapshot

• Manufacturer: Siemens
• Part number: HB3B030
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 30A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical installation tips

Ensure your panelboard is designed for bolt-on MCCBs and that the replacement matches the OEM specifications. Follow the manufacturer’s torque guidelines for mounting hardware to maintain a tight, vibration-resistant connection. Pair this breaker with compatible Siemens load centers to maintain consistent trip characteristics and protection profiles across the panel.