Residual current circuit breaker Type F EFI-2 F 40/0.03 002062528

Overload and short‑circuit protection in three‑phase installations

Residual current circuit breaker type F with a residual current rating of 30 A is intended to protect the installation from insulation damage and fire hazards — it is not intended for personal protection against electric shock, because its tripping value is too high. Type F means it detects alternating residual currents, pulsating DC and distorted currents with higher harmonics — making it suitable for circuits with inverters, frequency converters or other devices that generate disturbances. Compared with type A, it has an extended detection capability — but it does not respond to the DC component below 10 mA, as this value has not been confirmed in the reference data.

Construction and mounting

Designed for DIN‑rail mounting, it occupies 2 modules and accommodates single‑ and multi‑core conductors with cross‑section from 1 to 35 mm² — allowing connection of large conductors without the need for terminals. The clamps are covered, preventing accidental contact with live parts. The “Test” button enables verification of device operation — required for protective systems. The breaker has a contact position indicator: ON (closed), OFF (manually opened) or TRIP (tripped). The lever can be sealed in the ON or OFF positions — an additional safety feature for commercial or industrial facilities. According to online data, insulated busbars can be mounted on the upper and lower terminals.

Compatibility and operating conditions

The rated insulation voltage Ui is 400 V — meaning the device is designed for 400 V three‑phase systems (L-L). Short‑circuit withstand current is 10 kA and the impulse voltage is 4 kV, ensuring stability during network faults. The tripping time is instantaneous — it reacts immediately when the residual current exceeds 30 A. Ambient temperature in operation: 25–40 °C — the range specified by the manufacturer as standard. Protection class IP20 provides protection against finger contact — sufficient for installations inside enclosures. Compliant with IEC/EN 61008-1, rated AC voltage: 400 V (confirmed in ETIM), frequency: 50/60 Hz (supplemented from internet sources). Rated current: 40 A — matching typical loads in industrial installations.