ge CDK3400 400A 3-Pole 240 V Circuit Breaker

Meet the GE CDK3400 400A 3-Pole 240V Circuit Breaker — a purpose-built main protection device for demanding electrical systems. With a 400 A rating, a three-pole design for 3-phase protection, and a 240 V operating voltage, this GE component is engineered to act as the centralized safeguard in large panels and industrial installations. Part Number CDK3400 identifies exact compatibility within GE’s breaker lineup.

• Current rating: 400 A
• Poles: 3-pole design for 3-phase applications
• Voltage rating: 240 V
• Part number: CDK3400
• Intended use: main service disconnect and protective interlock in GE panelboards and compatible electrical systems

Why this configuration matters: the 3-pole arrangement ensures all three phases shut down together, which is essential for protecting motors, pumps, and other 3‑phase equipment from unsafe phase imbalances during trips or maintenance. The 400 A capacity provides a straightforward upgrade path for higher-load environments without needing to rework the panel layout or wiring.

• Ideal applications: main protection for large GE panels in commercial spaces, light industrial settings, and facilities with substantial 3-phase loads.
• Use cases: servicing heavy HVAC, manufacturing lines, or multi‑unit electrical feeders where a reliable, centralized disconnect is required.
• Compatibility: designed for GE electrical systems and panels that support the CDK3400 main breaker form factor and rating.

Installation and safety notes: use a licensed electrician. Verify that your panel supports a 400 A, 3-pole, 240 V main breaker of this type, confirm mounting and bus compatibility, and follow all local codes and NEC guidelines. Proper torque on terminations and correct alignment within the panel are essential for reliable operation and safety during servicing.

Specifications at a glance

• Current rating: 400 A
• Poles: 3
• Voltage rating: 240 V
• Part number: CDK3400
• Application: main service disconnect for GE panels and compatible systems