Siemens ED43B090 - 90 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens ED43B090 is a 90A, 480V, 3-pole bolt-on molded-case circuit breaker engineered to deliver dependable branch-circuit protection in panelboards and loadcenters. Built for rugged reliability, its bolt-on mounting creates a solid, vibration-resistant bus connection that stays secure even in demanding commercial and industrial environments. The thermal-magnetic trip unit provides stable, repeatable protection—quickly responding to overloads and short circuits to minimize damage and downtime. Key advantages - Secure bolt-on mounting: A rigid connection to the bus reduces loosening from vibration or movement, helping maintain consistent protection over time. - Thermal-magnetic trip: Combines thermal and magnetic sensing for accurate, dependable clearing of overloads and short circuits across a wide range of fault conditions. - OEM-compatible design: Engineered to pair with matching Siemens OEM loadcenters and panelboards for straightforward retrofits and new installations. - Versatile applications: Suitable for residential, commercial, and light industrial panels, especially in 3-phase 480V distributions. Technical specifications - Manufacturer: Siemens - Part Number: ED43B090 - Type: Thermal-magnetic molded case circuit breaker - Amperage Rating: 90A - Voltage Rating: 480V - Number of Poles: 3 - Mounting Style: Bolt-on - Application: Branch circuit overcurrent and short-circuit protection Ideal use scenarios - Upgrading electrical panels in commercial buildings where 3-phase 480V services are standard - Replacing or expanding protection in panelboards within small to mid-size industrial setups - Implementing reliable protection for HVAC equipment, large motor loads, and other high-current 3-phase circuits - Retrofit projects that require a secure, vibration-resistant connection and OEM-compatible form factor What you gain with Siemens ED43B090 - Peace of mind from precise, repeatable protection in challenging environments - A robust mounting solution that reduces maintenance concerns and connection drift - A proven, OEM-aligned component that simplifies compatibility and stocking for electricians and technicians If you’re sourcing a dependable 3-pole bolt-on breaker for 480V systems, the Siemens ED43B090 delivers precise protection, durable mounting, and OEM compatibility to keep commercial and light industrial electrical systems running smoothly.