Siemens B340 - 40A, 3-Pole, Circuit Breaker

Meet the Siemens B340—a robust 40A, 3-Pole Circuit Breaker designed to safeguard three-phase power systems in demanding environments. Built for industrial, commercial, and OEM applications, it provides dependable overcurrent protection in distribution panels and motor control centers.

Key capabilities at a glance:

• 40A current rating—protects feeders, motors, and downstream equipment from overloads and faults.
• 3-Pole design—ensures synchronized disconnection across all three phases for balanced protection in three-phase circuits.
• Versatile deployment—suited for panelboards, switchboards, and control panels, enabling flexible integration into existing gear and Siemens-compatible systems.
• Reliable performance—built to endure industrial and commercial settings where consistent protection matters.

Why this matters: In three-phase systems, an overload on one phase can cascade into costly downtime or equipment damage. The B340 interrupts all live conductors promptly, helping you minimize risk and keep operations moving smoothly.

Ideal use cases

• Panelboards and switchboards in manufacturing facilities
• Motor control centers requiring coordinated protection for three-phase loads
• OEM equipment where a compact, reliable 3-pole breaker is needed

What to expect in practice: easy replacement in Siemens-compatible setups, straightforward protection of feeders, and protection that aligns with standard electrical practices. By choosing the B340, you’re investing in a trusted solution that supports safety standards and uptime goals.

Who should consider the Siemens B340

Electrical contractors, facility managers, and system integrators responsible for distribution panels and motor control centers will appreciate its 40A rating and three-pole protection. It pairs well with other Siemens components to support cohesive, reliable electrical protection strategies.

Practical tips for use

• Confirm your system is a three-phase configuration to fully leverage the 3-pole design.
• Match the 40A rating with your load calculations to ensure optimal protection without nuisance trips.
• Plan for coordinated protection with upstream and downstream devices to optimize protection schemes in your panel or MCC.