Residual Current Circuit Breaker (RCCB) ETI EFI-P4 AC 63/0.03

The ETI EFI-P4 AC 63/0.03 is a residual current circuit breaker (RCCB) designed to detect alternating earth leakage currents and disconnect supply when dangerous leakage exceeds 30 mA. Rated for continuous load currents up to 63 A, this AC-type device monitors imbalance between live and neutral conductors to reduce the risk of electric shock and to limit fire hazards caused by insulation faults or accidental contact with live parts. It is intended for installation in residential and light-commercial distribution boards where protection against alternating residual currents is required.

Advantages

This RCCB provides fast disconnection at a sensitivity of 30 mA, combining reliable leakage detection with a 63 A rated current capacity suitable for typical household and small commercial circuits. As an AC-type detector, it is specifically designed to respond to sinusoidal alternating residual currents. The compact design fits standard DIN-rail enclosures and may be combined with compatible modular protective devices for coordinated protection in distribution boards.

Suitable for

• Residential distribution boards and apartment installations
• Light-commercial electrical installations such as small shops or offices
• Circuit protection where detection of alternating residual currents is required
• Situations requiring 30 mA protection to reduce risk of electric shock

When it may not be suitable

This AC-type RCCB is not designed to detect DC residual currents or certain types of pulsating leakage currents; installations with electronic equipment that can produce smooth DC components or high-frequency residual currents may require an A-type or B-type device instead. It is also not a combined overcurrent and residual current device; coordination with separate overcurrent protection (MCBs or fuses) is necessary where short-circuit and overload protection is required.

Key specifications

• Rated residual operating current: 30 mA (0.03 A)
• Rated current: 63 A
• Type: AC (responds to sinusoidal alternating residual currents)
• Poles: 2-pole unit for single-phase circuits
• Mounting: DIN-rail compatible modular enclosure

How to use

Mount the RCCB on a standard DIN rail inside the distribution board and connect the incoming supply conductors to the line terminals and outgoing conductors to the load terminals according to the wiring diagram. Ensure correct orientation and secure terminal tightening to the manufacturer’s recommended torque. After installation, test the device using its built-in test button or an external tester to verify operation before energising the protected circuits. Regular periodic testing is recommended to confirm continued functionality.

What to consider before purchase

• Ensure 63 A rated current is appropriate for the intended circuit and downstream protection
• Confirm AC-type sensitivity (30 mA) matches the types of residual currents present in the installation
• Check compatibility with the existing distribution board mounting and available space
• Plan required complementary overcurrent protection (MCBs or fuses) if not already present

Usage recommendations

Perform an initial functional test after installation and schedule regular tests (for example, monthly or per local regulations) to ensure reliable operation. For installations with electronic equipment that may produce DC or pulsating leakage currents, consider specifying an RCCB type appropriate for those leakage characteristics.