Square D | SDT240 | Circuit Breaker | 40A | 2-Pole | 240V | 10kA | Plug-In

Meet the Square D SDT240 40A 2-Pole 240V Plug-In Circuit Breaker, a precise, equipment-matching solution for panel maintenance, retrofit, and replacement projects. Engineered to fit panels that accept SDT-series plug-in breakers, this unit delivers reliable overcurrent protection for 240V circuits in both residential and light commercial settings.

• Amperage: 40A
• Poles: 2-Pole
• Voltage: 240V
• Interrupting Rating: 10kA
• Connection Type: Plug-In

Why this matters in real-world use:

• Creates a reliable safeguard for 240V circuits that power essential appliances and equipment, such as HVAC systems, water heaters, and other high-demand loads.
• The 10kA interrupting rating means it’s designed to quickly clear high-short-circuit faults, helping minimize damage to wiring and connected devices.
• Plug-in design enables faster, less invasive replacement or retrofit—great for service calls or panel upgrades with minimal downtime.
• Authentic Square D craftsmanship and SDT-series compatibility ensure a match-for-match fit in compatible panels, reducing the guesswork during installation.

Compatibility and ordering note: Confirm fit and ratings before purchasing. The part number SDT240 is the best reference to ensure the breaker will match your Square D panel’s specifications and bus design.

• Ideal for: electricians, facility managers, and homeowners with electrical experience performing panel maintenance or upgrades.
• Use cases: replacement of a failed 40A 2-pole 240V breaker, retrofit to add circuit protection for a 240V load, or maintenance of a panel that already accepts SDT plug-in breakers.
• Practical tip: Always verify that the panel labeling and the SDT series compatibility align with the SDT240 before proceeding with replacement to avoid mismatches.

With the Square D SDT240, you’re choosing a proven, purpose-built solution that pairs straightforward plug-in installation with robust protection for your 240V circuits. This is the dependable choice when you need to restore reliable, code-compliant circuit protection quickly and accurately.