NB340 | Circuit Breaker | 40A | 3-Pole | 240V | Bolt-On

The NB340 is an industrial circuit breaker designed for dependable protection in demanding 3-phase power environments. With a 40A rating, a 3-Pole configuration, and 240V operation, it’s built to safeguard motors, feeders, and other heavy loads while fitting seamlessly into retrofit, maintenance, and replacement projects.

• Amperage: 40A
• Poles: 3-Pole
• Voltage: 240V
• Mounting: Bolt-On
• Reference: Part number NB340

Why this NB340 stands out

Unlike generic replacements, NB340 is specifically identified for compatibility in industrial panels that require exact specs. The bolt-on design enables faster, cleaner installations with secure mounting, letting technicians swap in a like-for-like unit without lengthy rewiring or mismatches.

Ideal use cases

• Maintenance swaps in established 3-phase systems where 40A protection is appropriate
• Retrofits to bring older panels up to current protection standards without changing the bus layout
• Replacement of failed breakers in manufacturing lines, HVAC drives, and processing equipment that run on 240V

How to ensure a perfect fit

1. Before ordering, confirm that your panel or enclosure requires a 40A, 3-Pole, 240V bolt-on breaker and that the mounting footprint matches the NB340.
2. Use the part number NB340 as the primary compatibility reference to avoid mismatches.
3. Ensure that the breaker’s ratings align with the protected circuit’s voltage and current demands to maintain proper protection and coordination.

With the NB340, you gain a reliable, OEM-referenced solution that emphasizes exact matching specs, straightforward installation, and clear compatibility guidance—making it a practical choice for professional electricians and panel technicians focused on uptime and accuracy.