Siemens ED21B025 - 25 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens ED21B025 is a 25A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection where it matters most. Built for use in panelboards and loadcenters, this unit combines rugged mounting with precise, thermal-magnetic trip operation to guard your electrical system against overcurrent and short circuits.

Key specifications

• Amperage rating: 25A
• Voltage rating: 120V
• Poles: 1
• Mounting style: Bolt-on
• Trip type: Thermal-magnetic
• Construction: Molded case circuit breaker
• Manufacturer: Siemens

Why this breaker stands out

Security and reliability come first with the ED21B025. The secure bolt-on mounting creates a rigid, vibration-resistant connection to the bus, minimizing loosening risks in environments with equipment movement or cycling loads. The thermal-magnetic trip unit provides stable, repeatable protection across temperature fluctuations, reducing nuisance trips while still delivering fast response to real faults. And because it’s designed to be compatible with matching OEM loadcenters and panelboards, you can trust consistent performance and straightforward installation in your existing Siemens ecosystem.

Ideal use cases

• Residential circuits such as lighting, outlets, or small appliance branches in new or upgraded panelboards
• Commercial distribution boards where reliable single-pole protection is required for individual circuits
• Light industrial environments needing compact, easy-to-install protection for auxiliary or non-critical loads
• Panelboard retrofits where part-number compatibility ensures quick replacement without wiring or configuration changes

Compatibility, installation, and practical considerations

For best results, pair the ED21B025 with Siemens panelboards and loadcenters that specify compatible bolt-on molding and ED-series protection. This ensures a robust bus connection and synchronized protection characteristics across your distribution system. When installing, shut off mains power, follow the panelboard manufacturer’s torque and termination guidelines, and use the bolt-on mounting to secure the breaker per your enclosure’s requirements.

What you gain with the Siemens ED21B025

• Rigid, vibration-resistant mounting that preserves electrical integrity over time
• Stable overcurrent and short-circuit protection through a reliable thermal-magnetic trip mechanism
• Plug-and-play compatibility with matching OEM Siemens loadcenters and panelboards
• Clear, predictable protection for 25-amp circuits at 120V in a compact, one-pole form factor
• A practical, maintenance-light solution suitable for residential, commercial, and light industrial settings