Eaton CH340ST - 40 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Eaton CH340ST: a 40A, 240V, 3-pole plug-in molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Designed for quick, trouble-free installation and consistent protection, this unit is built to keep electrical systems running smoothly in residential, commercial, and light industrial settings.

• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 40A
• Voltage: 240V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Fast, reliable protection you can count on

The CH340ST employs a thermal-magnetic trip unit that delivers stable, repeatable protection performance across all three poles. This means a fault on one phase is rapidly isolated without unnecessary trips, reducing downtime and protecting both wiring and connected equipment.

Plug-in installation for quick life-cycle savings

With a fast plug-in connection, you can replace or upgrade breakers with minimal labor. This improves maintenance efficiency in OEM panelboards and load centers, helping technicians and facilities managers keep electrical systems up and running with less downtime.

Designed for compatibility and durable performance

Engineered to pair with matching Eaton OEM panelboards and load centers, the CH340ST delivers a proven fit and predictable performance in real-world installations. Its 3-pole design is ideal for 3-phase systems and multi-wire branch circuits, ensuring coordinated disconnection and enhanced personnel safety during faults.

Ideal use cases across multiple sectors

• Residential panels needing reliable 3-pole protection for multi-wire branch circuits
• Commercial load centers supporting lighting, receptacle circuits, and small equipment loads
• Light industrial panels with 3-phase equipment and motors requiring quick-replace protective devices

Practical considerations and tips

• Ensure the breaker is matched to the OEM panelboard or load center for optimal trip coordination and fit.
• Use in circuits where rapid interruption of all three phases is essential for motor protection and personnel safety.
• When replacing an existing device, confirm the 40A rating and 240V operation align with the circuit’s load and wiring gauge.
• Keep spare plug-in breakers on hand to minimize downtime during routine maintenance or panel upgrades.