Siemens ED21B030 - 30 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens ED21B030—a 30A, 120V, 1-pole bolt-on molded case circuit breaker engineered to protect branch circuits in panelboards and load centers with consistent, dependable performance.

What makes this breaker stand out

• Secure bolt-on mounting delivers a rigid, vibration-resistant bus connection, minimizing looseness and arc risk in busy electrical environments.
• Thermal-magnetic trip unit provides stable, repeatable protection—responding to overloads with a precise thermal mechanism and handling short circuits with an instantaneous magnetic response.
• 1-pole, 30A, 120V configuration is ideal for standard single-phase circuits common in homes and light commercial spaces, delivering targeted protection where it’s needed most.
• OEM-friendly compatibility works seamlessly with matching Siemens OEM load centers and panelboards, ensuring proper fit, interchangeable protection, and reliable operation.
• Versatile application suitable for residential, commercial, and light industrial environments—whether upgrading an existing panel or configuring a new distribution setup.

Why you’d use the ED21B030

When you need dependable branch circuit protection for 120V circuits, the ED21B030 delivers predictable performance with every trip. Its bolt-on design makes installation in compatible panelboards straightforward and secure, reducing the chance of loose connections that can lead to nuisance trips or electrical noise. The thermal-magnetic protection curve is well-suited for everyday loads and occasional surges, helping to protect wiring, devices, and occupants alike.

Technical specifications at a glance

• Brand: Siemens
• Part Number: ED21B030
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Ideal use cases

• Residential panel upgrades to improve protection on individual 120V branch circuits
• New construction or retrofit projects in garages, workshops, and small commercial spaces
• Light industrial applications where reliable, easy-to-service protection is essential
• Systems requiring compatibility with Siemens OEM load centers and panelboards for seamless integration

In short, the Siemens ED21B030 is a purpose-built solution for safe, reliable, and maintainable circuit protection. Its combination of secure mounting, precise thermal-magnetic protection, and OEM compatibility makes it a practical upgrade or replacement choice for professionals and informed DIYers alike.