Siemens HB3B050 - 50 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens HB3B050 is a robust 50A, 240V, 3-pole bolt-on molded case circuit breaker designed to safeguard electrical systems in panelboards and load centers. Built for dependable branch circuit overcurrent and short-circuit protection, this breaker delivers consistent performance across residential, commercial, and light industrial applications.

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, helping maintain reliable protection even in environments with equipment start-ups or movement.
• Thermal-magnetic trip unit delivers stable, repeatable protection: the thermal element handles overloads while the magnetic element responds quickly to short circuits for fast interruption.
• OEM compatibility designed to pair with matching Siemens load centers and panelboards, ensuring proper fit, alignment, and coordinated protection.
• Three-pole design delivers dependable three-phase protection for balanced distribution and equipment that requires multi-phase interruption.
• Directly applicable for branch circuits with a 50A rating and 240V operation, ideal for protecting feeders and critical circuits in panel installations.
• Rugged molded case construction supports long-term operation in everyday electrical environments, from home garages to small commercial spaces.

Key specifications

• Manufacturer: Siemens
• Part Number: HB3B050
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 50 A
• Voltage rating: 240 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Who this is for and practical use

• Ideal for installers upgrading or expanding residential panels, light commercial panels, or small industrial distribution boards that require reliable three-phase protection.
• Great as a direct replacement for Siemens-based systems, helping ensure compatibility and streamlined maintenance with OEM components.
• Useful for protecting feeders and critical loads in new installations or renovations where a secure, vibration-resistant connection matters.

Tips for optimal performance

When planning installation, pair the HB3B050 with a matching Siemens panelboard to ensure optimal bus alignment and protection coordination. The bolt-on design simplifies mounting in compatible enclosures, contributing to a clean, secure setup with fewer loose connections and wobble over time. Regularly verify that system voltages and load profiles align with the 240V, 50A ratings to maintain reliable protection for your critical circuits.