EATON FRCDM-40/4/03-S/A Residual Current Circuit Breaker 4P 40A 0.3A Type S/A

The EATON FRCDM-40/4/03-S/A is a high-performance 4-pole residual current circuit breaker (RCCB) engineered to provide robust electrical protection in both residential and industrial environments. This device is specifically designed to detect and interrupt residual currents, effectively preventing electrical hazards and ensuring the safety of connected equipment and personnel. By integrating advanced technology, it offers reliable performance in demanding electrical systems.

Advantages

This circuit breaker stands out due to its selective Type S/A classification, which allows for delayed tripping to ensure coordination with other protective devices in a circuit. It is capable of detecting both alternating (AC) and pulsating direct (DC) residual currents, making it highly versatile for modern electrical installations that include electronic components. The robust construction ensures long-term operational stability and high resistance to nuisance tripping, which is critical for maintaining continuous power supply in sensitive applications.

Suitable for

• Residential electrical distribution boards
• Industrial machinery and control panels
• Systems requiring selective protection coordination
• Installations with electronic equipment sensitive to AC and pulsating DC currents

When it may not be suitable

This device is not intended for use in circuits where a standard instantaneous trip is required for primary personnel protection, as the selective Type S characteristic introduces a deliberate delay. It is also not suitable for direct current (DC) only systems or applications exceeding its rated current and voltage specifications.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Rated residual operating current: 0.3A
• Type: S/A (Selective, AC and pulsating DC sensitive)

How to use

The installation must be performed by a qualified electrician in accordance with local electrical codes and safety regulations. The device is designed for mounting on a standard DIN rail within an electrical distribution enclosure. Ensure that the supply cables are correctly connected to the input terminals and that the load is connected to the output terminals, observing the correct polarity and torque settings as specified by the manufacturer.

What to consider before purchase

• Verify that the 40A rated current matches your circuit requirements
• Ensure the 0.3A sensitivity is appropriate for your specific protection needs
• Confirm that the selective (S) characteristic is compatible with your existing upstream or downstream protection devices

Usage recommendations

Regularly test the functionality of the residual current circuit breaker using the integrated test button to ensure the mechanism remains operational and provides the intended level of safety.