Siemens P240 - 40 A, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens P240—40A, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for consistent performance, this breaker keeps electrical systems safe and running smoothly across a range of settings.

Why the Siemens P240 stands out

• Secure bolt-on mounting: A rigid, vibration-resistant bus connection minimizes movement and ensures a reliable, long-term electrical contact even in busy electrical rooms or environments with equipment vibration.
• Thermal-magnetic trip unit: Combines a precise thermal response to sustained overcurrent with an instantaneous magnetic trip for short circuits, delivering stable protection and fast fault disruption without nuisance trips.
• OEM-compatible design: Specifically engineered to pair with matching Siemens loadcenters and panelboards, simplifying replacement, maintenance, and system integrity without adapters or modifications.
• Versatile for multiple applications: Ideal for residential, commercial, and light industrial projects where reliable 40A protection is required on a single-pole circuit.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: P240
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Residential panels requiring a robust 40A protection device for lighting, outlets, or appliance circuits.
• Small commercial installations where secure mounting and reliable trip behavior are essential for safety and code compliance.
• Light industrial setups that demand consistent protection in panels designed for Siemens bolt-on breakers.

Performance, protection, and how it compares

• Bolt-on construction prioritizes a solid, low-resistance connection that remains dependable over time, particularly in rooms with frequent door openings, HVAC activity, or equipment vibrations.
• The thermal-magnetic trip offers both controlled, time-delayed protection for overcurrent and immediate response to short circuits, balancing safety and continuity of service without complex settings.

Tips for optimal operation

• Install in panelboards and loadcenters listed for Siemens P-series breakers to ensure proper fit, electrical characteristics, and cooling performance.
• Verify the circuit demands align with the 40A rating to maintain proper protection coordination and minimize nuisance trips on nearby loads.
• Ensure secure bolt tightening to preserve the integrity of the bus connection and reduce contact resistance under load.