Siemens ED43B020L - 20 A, 480 V, 3-Pole Circuit Breaker | AmpState

Meet the Siemens ED43B020L, a 20A, 480V, 3-pole molded case circuit breaker built to protect your electrical system with precision and reliability. Designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers, this device helps you keep critical loads safe while maintaining a clean, efficient electrical enclosure.

• Compact molded-case design maximizes panel space, letting you protect more circuits without enlarging the panel footprint.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining steady thermal overload sensing with rapid magnetic response to short circuits, reducing nuisance trips and improving reliability.
• 3-pole configuration ensures simultaneous disconnection of all three conductors in a 3-phase system, enhancing safety and maintaining system integrity during faults.
• OEM panel compatibility engineered to fit seamlessly with matching Siemens OEM load centers and panelboards, supporting straightforward installation and coordinated protection schemes.
• Versatile applications suitable for residential, commercial, and light industrial environments where 480V three-phase power is used.

Technical specifications

• Manufacturer: Siemens
• Part Number: ED43B020L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 480V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker is a smart choice

For panel builders and maintenance teams, the ED43B020L delivers predictable, dependable protection aligned with Siemens protection profiles. Its compact form reduces enclosure fill, while the thermal-magnetic trip mechanism provides robust defense against both overloads and short circuits. The three-pole design is essential for ensuring that three-phase equipment disconnects safely and simultaneously, helping you meet safety standards and code requirements with confidence. When paired with compatible Siemens panels, this breaker supports coordinated protection that can simplify troubleshooting and improve overall system reliability.

Ideal use cases

Use the ED43B020L in panelboards and load centers that service 480V three-phase equipment such as distribution transformers, motors, conveyor systems, HVAC controllers, and other light industrial or commercial circuits. It’s equally at home in retrofit projects and new builds where space efficiency and reliable protection are priorities.

Practical tips

• Verify that the panel you’re integrating with is compatible with Siemens ED43B020L to ensure proper fit and coordinated trip characteristics.
• Match the 20A rating to the specific branch circuit load to prevent nuisance trips while maintaining adequate protection.
• Plan layout in the panel to maximize space efficiency—the compact design helps you fit additional circuits without expanding the enclosure.