EATON AZ-C40 Miniature Circuit Breaker, 1P, C-Curve, 40A, 25kA

The EATON AZ-C40 is a high-performance 1-pole miniature circuit breaker engineered to provide reliable protection for electrical circuits in demanding environments. With a rated current of 40A and a C-type tripping characteristic, this device is specifically designed to handle the starting currents of inductive loads while maintaining precise protection against overloads and short circuits. Its robust construction and high breaking capacity of 25kA make it an essential component for maintaining safety and operational continuity in complex electrical distribution systems.

Advantages

This miniature circuit breaker stands out due to its exceptional breaking capacity, which allows it to safely interrupt high fault currents that could otherwise damage sensitive equipment. The C-curve characteristic provides a balanced response, ensuring that the breaker does not trip unnecessarily during brief power surges common in motor or lighting circuits. Its compact 1-pole design facilitates efficient use of space in distribution boards, while the high-quality engineering from EATON ensures long-term reliability and consistent performance under continuous load conditions.

Suitable for

• Industrial electrical distribution panels
• Commercial building power systems
• Protection of motor circuits and lighting installations
• High-demand electrical infrastructure requiring 25kA fault protection

When it may not be suitable

This device is not intended for residential applications where a lower breaking capacity is typically sufficient and cost-effective. It is also not suitable for circuits requiring B-curve or D-curve tripping characteristics, as the C-curve is specifically calibrated for standard industrial and commercial inductive loads.

Key specifications

• Number of poles: 1
• Rated current: 40A
• Tripping characteristic: C-curve
• Breaking capacity: 25kA
• Application: Industrial and commercial electrical systems

How to use

The EATON AZ-C40 should be installed by a qualified electrician into a standard DIN-rail distribution board. Ensure that the supply voltage matches the device ratings and that the incoming and outgoing cables are securely fastened to the terminals to prevent overheating. Once installed, the toggle switch can be used to manually disconnect the circuit for maintenance or to reset the breaker after a fault has been cleared.

What to consider before purchase

• Verify that the 40A rated current matches your circuit requirements
• Ensure the 25kA breaking capacity is appropriate for your installation's short-circuit current levels
• Confirm that the C-curve characteristic is compatible with your connected equipment
• Check available space in your distribution board for a 1-pole module

Usage recommendations

Regularly inspect the circuit breaker for signs of thermal damage or loose connections. If the breaker trips, investigate the cause of the overload or short circuit before resetting the device to ensure continued safe operation.