Siemens ED42B090 - 90 A, 480 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens ED42B090 is a 90A, 480V, 2-pole bolt-on molded case circuit breaker engineered to deliver dependable branch circuit protection in panelboards and loadcenters. This device guards electrical circuits from overcurrent and short-circuit conditions while standing up to the demands of commercial and light industrial power environments.

• Secure bolt-on mounting: provides a rigid, vibration-resistant bus connection, minimizing loosening risk and delivering consistent trip performance even in installations with vibration or frequent switching.
• Thermal-magnetic trip unit: combines precise thermal overload sensing with fast magnetic actuation for short circuits, ensuring stable, repeatable protection across temperature and load variations.
• OEM-compatible design: designed to pair with Siemens panels and matching OEM loadcenters, enabling straightforward replacements and reliable electrical fitment.
• Versatile 2-pole protection: ideal for protecting branch circuits in 480V systems—suitable for commercial, light industrial, and select residential applications where 480V service is present.
• Specifications at a glance:
  • Manufacturer: Siemens
  • Part Number: ED42B090
  • Type: Thermal-magnetic molded case circuit breaker
  • Amperage Rating: 90A
  • Voltage Rating: 480V
  • Number of Poles: 2
  • Mounting Style: Bolt-on
  • Application: Branch circuit overcurrent and short-circuit protection

Use cases and practical benefits:

• Feeding motor control centers and distribution panels in light industrial environments where 480V distribution is standard.
• Replacing worn-out breakers in existing Siemens or OEM loadcenters to maintain consistent trip characteristics and minimize downtime.
• Mounting in panels exposed to vibration (e.g., equipment rooms, portable substations) where bolt-on reliability reduces risk of connection loosening.

With the ED42B090, you get a purpose-built protection device that not only shuts down faults fast but also stays reliable under real-world conditions. It’s a solid, long-term choice for electricians and facilities managers who demand predictable performance and easy compatibility with existing Siemens panel ecosystems.