EATON AZ-4-B40 Miniature Circuit Breaker, 4-Pole, B-Characteristic, 40A, 25kA

The EATON AZ-4-B40 is a high-performance 4-pole miniature circuit breaker engineered to provide reliable protection for electrical circuits in demanding industrial and commercial environments. This device is designed to safeguard power distribution systems by effectively interrupting current flow during overloads or short circuits, thereby preventing potential damage to connected equipment and infrastructure. With its robust construction and high breaking capacity, it serves as a critical component for maintaining the integrity and safety of AC electrical installations.

Advantages

This circuit breaker offers exceptional reliability and durability, ensuring consistent performance even under heavy electrical loads. Its 4-pole configuration allows for the simultaneous disconnection of all phases, providing comprehensive protection for three-phase systems with a neutral conductor. The B-tripping characteristic makes it particularly suitable for applications where moderate inrush currents are expected, while the high 25kA breaking capacity ensures that the device can safely handle significant fault currents without compromising the safety of the electrical network.

Suitable for

• Industrial power distribution panels
• Commercial building electrical systems
• Protection of three-phase motors and heating equipment
• General AC electrical installations requiring high fault current protection

When it may not be suitable

This device is not intended for use in DC electrical systems, as it is specifically designed for AC applications. Furthermore, it may not be appropriate for circuits with extremely high inrush currents, where a C or D tripping characteristic would be required to prevent nuisance tripping.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Tripping characteristic: B
• Breaking capacity: 25kA
• System type: AC

How to use

The circuit breaker should be installed by a qualified electrician in accordance with local electrical codes and safety regulations. It is designed for mounting on a standard DIN rail within a distribution board or enclosure. Ensure that the supply cables are securely connected to the input terminals and that the load cables are properly attached to the output terminals, maintaining the correct torque settings as specified by the manufacturer. Once installed, the device can be manually switched on or off using the toggle lever on the front panel.

What to consider before purchase

• Verify that the 40A rated current matches the requirements of your specific circuit load.
• Ensure that the 25kA breaking capacity is sufficient for the prospective short-circuit current at the point of installation.
• Confirm that the B-characteristic is appropriate for the type of equipment being protected.
• Check the physical dimensions of your distribution board to ensure adequate space for a 4-pole device.

Usage recommendations: Regularly inspect the circuit breaker for signs of physical damage or overheating. It is recommended to perform periodic functional testing to ensure the mechanism remains operational and that the device continues to provide the intended level of protection for your electrical installation.