BRKR QD 3/4 2P 120/240V 40A

🔌 What it is

The D240 is a Siemens 2-pole, 40-amp circuit breaker used in residential and light commercial load centers to protect 240-volt branch circuits.

It is part of Siemens’ QP/Type QP breaker family (plug-on breakers).

🧾 What the model means

• D → Siemens breaker series/type designation (2-pole QP-style breaker family)
• 240 → 40 amps, 2-pole (240V circuit)

⚡ What it does

This breaker:

• Provides overcurrent protection for 240V circuits
• Trips on overload or short circuit conditions
• Uses two poles tied together for 240V operation
• Installs in compatible Siemens load centers
• Protects loads like motors, HVAC, water heaters, and equipment circuits

Typical applications include dedicated 240V loads requiring 40A protection.

🏠 Typical uses

• Electric water heaters
• HVAC condensers
• Small subpanels
• Shop equipment
• EVSE circuits (depending on charger rating, though 40A is common for 32A EVSEs)

🧠 Simple explanation

This is a 40-amp double breaker that shuts off power if a 240V circuit draws too much current or shorts out.