Residual Current Circuit Breaker ETI EFI-P4 A 25/0.03 4-pole Type A 415V 25A Un-delayed 50/60Hz

ETI EFI-P4 A 25/0.03 is a 4-pole residual current circuit breaker (Type A) rated for 415 V and 25 A with a 30 mA residual current trip threshold. It is designed to detect alternating and pulsating direct leakage currents and to provide fast, instantaneous disconnection (un-delayed) at 50/60 Hz for protection of people and to reduce fire risk in residential, commercial and light industrial electrical installations.

Advantages

The device offers sensitive 30 mA residual current detection and instantaneous trip action for rapid fault clearing. As a Type A unit it detects both AC and pulsating DC leakage currents. The 4-pole configuration supports three-phase systems up to 415 V, while the 25 A rating suits circuits with moderate load. Construction follows standard RCCB practice to provide reliable operation at 50/60 Hz.

Suitable for

• Protection of circuits in three-phase 415 V installations
• Residential distribution boards and small commercial switchboards
• Circuits where detection of AC and pulsating DC leakage is required (Type A)
• Applications needing 30 mA personnel protection and fire risk reduction

When it may not be suitable

This residual current circuit breaker is not intended for protection of circuits that require higher continuous current ratings than 25 A or for systems where delayed tripping is needed. It does not provide overcurrent protection beyond its rated current and therefore should be used together with appropriate circuit breakers or fuses for overload and short-circuit protection.

Key specifications

• Type: Type A (detects AC and pulsating DC leakage)
• Poles: 4-pole (suitable for three-phase plus neutral)
• Rated operational voltage: 415 V AC
• Rated current: 25 A
• Residual trip threshold: 30 mA (0.03 A)
• Tripping characteristic: instantaneous (un-delayed)
• Rated frequency: 50/60 Hz

How to use

Install the ETI EFI-P4 A in the distribution board on a suitable DIN rail according to local electrical standards and wiring diagrams. Connect the three-phase conductors and neutral to the corresponding input and output terminals, ensuring proper tightening torque and correct orientation. Combine this residual current device with appropriate overcurrent protection upstream or downstream as required by the installation. Test the device after installation using the built-in test button or a suitable external tester to confirm operation.

What to consider before purchase

• Ensure 25 A rated current matches expected circuit load and diversity
• Confirm Type A detection (AC and pulsating DC) is appropriate for connected equipment
• Verify the device fits a 4-pole space in the distribution board and supports 415 V systems
• Plan additional overcurrent protection if overload or short-circuit protection is required

Usage recommendations

For reliable protection, pair the ETI EFI-P4 A 25/0.03 with suitable upstream circuit breakers sized for short-circuit and overload protection, and perform periodic testing (monthly or as required by regulation) using the test function to ensure the residual current device operates correctly.