Siemens ED43B100 - 100 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens ED43B100 is a robust 100 A, 480 V 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for real-world electrical environments, this unit offers a compact, durable solution for commercial, residential, and light industrial installations.

• Bolt-on mounting provides a rigid, vibration-resistant bus connection—ensuring consistent electrical contact and reliable performance even in rooms with heavy equipment or dynamic electrical loads.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining overload sensing (thermal) with fast short-circuit clearing (magnetic), reducing nuisance trips while safeguarding the circuit.
• Three-pole configuration supports three-phase systems, making it ideal for commercial and light industrial panels that run motors, HVAC gear, and distributed loads.
• OEM panel compatibility is designed to work in matching Siemens OEM load centers and panelboards, ensuring consistent fit, trip curves, and easier replacement during maintenance or upgrades.
• Versatile applications suitable for residential, commercial, and light industrial environments where reliable protection and quick fault isolation are critical.

Technical snapshot

• Manufacturer: Siemens
• Part Number: ED43B100
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 480 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why choose the ED43B100? It’s designed for teams that demand consistent protection under varying load conditions and straightforward installation in panel assemblies. The bolt-on design simplifies mounting in service panels and minimizes vibration-induced wear, while the thermal-magnetic protection strategy provides reliable operation across temperature ranges and fault scenarios. Whether you’re upgrading an old panel, consolidating distribution for a new build, or stocking spare parts for service crews, this 3-pole Siemens breaker helps keep critical circuits safe and accessible.

Use cases include distributing power to commercial equipment rooms, protecting motor circuits in HVAC and pumping systems, and serving as a reliable supply feed for multi-branch load centers. With its 100 A rating and three-phase compatibility, the ED43B100 is a precise, long-term solution for maintaining system integrity in everyday electrical infrastructure.