Siemens | D140 | Circuit Breaker | 40A | 1-Pole | 120V | Plug-In

Meet the Siemens D140—your trusted 40A, 1-Pole, 120V plug-in circuit breaker designed for fast, reliable protection in compatible Siemens load centers. Built for maintenance, retrofit, and replacement projects, this breaker delivers precise current control where it matters most, keeping your electrical system safe and code-compliant.

Core specifications

• Amperage: 40A
• Poles: 1-Pole
• Voltage: 120V
• Connection: Plug-In
• Part reference: D140

Why choose the D140 for your panel

The D140 is purpose-built for Siemens panels that require a 40-amp, single-pole, 120-volt plug-in breaker. Its plug-in design enables quick, clean replacements without panel rearrangement, helping you minimize downtime during service or upgrades. Since the part number D140 is the strongest compatibility signal, use it as the primary reference when verifying fit before ordering.

Use cases and practical applications

• Residential branch circuits that need reliable 40A protection within Siemens load centers.
• Retrofits or panel upgrades where original equipment calls for a plug-in breaker with 120V operation.
• Maintenance replacements that preserve the original panel architecture, ensuring consistent performance and safety.

Install and safety notes

Before purchasing and installing, confirm compatibility with your specific Siemens panel model. Always power down the main circuit before replacement and adhere to local electrical codes. If you’re unsure about fit or installation, consult a licensed electrician to verify ratings and proper securement.

What you get

1 x Siemens D140 40A, 1-Pole, 120V Plug-In Circuit Breaker.