Siemens | E42B030 | Circuit Breaker | 30A | 2-Pole | Bolt-On

Siemens E42B030 30A 2-Pole Bolt-On Circuit Breaker is built to deliver reliable overcurrent protection in maintenance, retrofit, and replacement projects where precise compatibility matters. This bolt-on breaker is designed to fit Siemens panels and enclosures that require a two-pole, 30-amp unit with a secure bolt-on mounting.

Key specifications:

• Amperage: 30A
• Poles: 2-Pole
• Mounting: Bolt-On
• Part number: E42B030

Notes: Confirm fit and ratings before ordering. The part number is the best reference for compatibility.

Why this breaker stands out

Unlike plug-in counterparts, this bolt-on design offers a solid mechanical attachment that stays secured under demanding electrical panel conditions. The 2-pole layout ensures simultaneous disconnection of both live conductors, which is essential for 240V circuits and equipment that require full isolation.

Ideal use cases

• Maintenance and service of existing Siemens bolt-on panels that specify 30A, 2-pole protection.
• Retrofit projects where matching the exact part reference E42B030 is critical to maintain panel labeling and trip characteristics.
• Replacement of worn or damaged breakers in systems that demand a precise, OEM-compatible bolt-on solution.

Installation tips and best practices

• Power down the panel and verify zero voltage on the line before installation.
• Ensure the bolt-on mounting is clean and free of debris to maximize contact integrity.
• Use the manufacturer's torque specifications to secure the mounting hardware (avoid over-tightening).

What you can expect

With this Siemens E42B030 breaker, you gain dependable protection for circuits demanding a 30-amp capacity and two-pole isolation. Designed for retrofit and replacement workflows, it helps minimize downtime and ensures the panel continues to meet safety and code requirements with an authentic Siemens replacement part.