Siemens ED21B020L - 20 A, 120 V, 1-Pole Circuit Breaker | AmpState

Meet the Siemens ED21B020L — a purpose-built 20A, 120V, 1-pole molded case circuit breaker engineered to protect your electrical system with precision. Designed for dependable branch circuit overcurrent and short-circuit protection, this breaker is a smart choice for panelboards and loadcenters across residential, commercial, and light industrial environments.

Why this breaker stands out

• Space-efficient design: The compact molded case construction maximizes panel space, making it ideal for crowded or retrofit panels where every inch counts.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection against overcurrent and short circuits, reducing nuisance trips and ensuring consistent performance over time.
• OEM compatibility: Engineered to be compatible with matching Siemens OEM loadcenters and panelboards, promoting reliable fit and electrical continuity.
• Versatile application: Suitable for a range of settings — from homes to small commercial and light industrial installations — where 120V, single-pole protection is required.

Technical snapshot

• Manufacturer: Siemens
• Part Number: ED21B020L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 120V
• Poles: 1
• Application: Branch circuit overcurrent and short-circuit protection

Designed for professionals and DIYers alike, the ED21B020L offers a straightforward path to upgrading or expanding panel capacity without sacrificing protection quality. Its 1-pole configuration is perfect for individual branch circuits, providing targeted protection where you need it most while keeping installation clean and organized.

Practical tips for use include verifying that your panelboard is compatible with Siemens ED-series breakers and ensuring power is fully disconnected before replacement. When replacing an existing breaker, match the ED21B020L to the panel’s listed specs and tighten connections to the manufacturer’s recommended torque. For ongoing reliability, pair this breaker with properly rated conductors and protective devices within the same electrical system to maintain balanced protection across circuits.

Whether you're upgrading an aging panel, adding a new 120V circuit, or consolidating space in a compact panel, the Siemens ED21B020L delivers dependable protection with a design that respects your panel layout and your budget.