Siemens | E21B030 | Circuit Breaker | 30A | 1-Pole | 120V | Bolt-On

Meet the Siemens E21B030—a dependable 30A, 1-pole, 120V bolt-on circuit breaker designed for maintenance, retrofit, and replacement projects where exact compatibility matters. Built by Siemens, this part is purpose-built to deliver reliable overcurrent protection for single‑phase circuits in compatible panels.

Key specifications

• Amperage: 30 A
• Poles: 1-Pole
• Voltage: 120 V
• Mounting: Bolt-On
• Part number: E21B030

Why this breaker matters

The E21B030 combines Siemens engineering with a robust bolt-on design, offering a secure, screw-secured connection ideal for panels that require proven mechanical stability. Its 30A rating ensures appropriate protection for dedicated 120V circuits—think lighting, outlets, and other critical branch circuits in residential or light commercial settings—without unnecessary tripping on normal startup surges.

Ideal use cases

• Replacement for aging or damaged 30A single-pole breakers in compatible Siemens panels
• Retrofit projects where a bolt-on solution is required for a secure, vibration-resistant install
• Maintenance tasks that demand a genuine Siemens part with matching electrical specs
• Single-pole protection for 120V circuits such as lighting runs, receptacle lines, and controlled equipment

Compatibility & installation tips

• Verify fit: Confirm that your panel accepts bolt-on, 1-pole, 30A, 120V breakers and that E21B030 matches the existing specifications.
• Reference part number: Use E21B030 as the primary reference for compatibility and ordering.
• Manufacturer guidance: Before purchasing, check panel documentation or consult a licensed electrician to ensure proper fit and safe installation.
• Installation note: Follow standard bolt-on mounting procedures and ensure a secure connection to maintain electrical safety and reliable operation.

Choosing a genuine Siemens component like the E21B030 helps maintain consistent protection across your electrical system, reduces the risk of nuisance trips, and simplifies future maintenance with a part designed to align with your existing panel architecture. If you’re upgrading or replacing a 30A, 120V single-pole circuit in a compatible panel, the Siemens E21B030 provides a straightforward, dependable path to restored safety and performance.