Eaton PFIM-40/4/03-A Residual Current Circuit Breaker 4P 40A 300mA Type A

The Eaton PFIM-40/4/03-A is a high-performance 4-pole residual current circuit breaker (RCCB) engineered to provide robust electrical safety in various distribution systems. This device is designed to monitor electrical circuits and automatically disconnect power when a residual current is detected, effectively preventing potential hazards such as electric shocks or fire risks caused by insulation faults. With its Type A classification, it offers comprehensive protection by detecting both standard sinusoidal AC residual currents and pulsating DC residual currents, making it a versatile choice for modern electrical installations.

Advantages

The primary advantage of this Eaton RCCB is its advanced Type A sensitivity, which ensures reliable operation even in circuits containing electronic components that may produce non-sinusoidal fault currents. Its 4-pole configuration allows for seamless integration into three-phase electrical systems, providing balanced protection across all phases. The device is built to high manufacturing standards, ensuring durability and consistent performance over long periods of operation in both residential and commercial environments.

Suitable for

• Residential electrical distribution boards
• Commercial building power systems
• Protection of circuits with electronic equipment
• Installations requiring Type A residual current detection

When it may not be suitable

This device is not intended for use in circuits where the residual current exceeds the 300mA threshold, as it is designed for fire protection and general safety rather than direct contact protection in high-sensitivity applications. It is also not suitable for DC-only circuits or systems requiring Type B protection for specific industrial frequency converters.

Key specifications

• Number of poles: 4
• Rated current: 40A
• Rated residual operating current: 300mA
• Residual current type: Type A
• Mounting type: DIN rail

How to use

The Eaton PFIM-40/4/03-A must be installed by a qualified electrician in accordance with local electrical regulations. It is designed for mounting onto a standard DIN rail within a distribution cabinet. Ensure that the supply cables are connected to the top terminals and the load cables to the bottom terminals, maintaining correct phase sequence. After installation, the device should be tested using the integrated test button to verify its mechanical and electrical functionality.

What to consider before purchase

• Verify that the 40A rated current matches your circuit load requirements.
• Ensure the 300mA sensitivity is appropriate for your specific fire protection or equipment safety needs.
• Confirm that your electrical system requires a 4-pole device for three-phase distribution.
• Check available space on the DIN rail within your distribution board.

Usage recommendations

Regularly test the residual current circuit breaker using the built-in test button at least every six months to ensure the internal mechanism remains operational and the device continues to provide the intended level of safety.