For a three‑phase distribution board serving an office floor, a small workshop, or a residential complex, the main RCCB needs to handle both the load current and the fault detection across all three phases and neutral. The ABB F204A‑40/0.03 is that device: 4 poles, 40 A continuous, 30 mA sensitivity, Type A detection.

What 40 A and 4 Poles Actually Mean
Four poles means this device switches all three phases plus neutral — the correct configuration for a three‑phase supply. The 40 A rating makes it suitable for main incomer protection where the total load does not exceed 40 A per phase. Typical applications include small commercial premises, industrial control panels, three‑phase equipment supplies, and larger residential units with three‑phase connections. If your total connected load exceeds 40 A, step up to the 63 A or 80 A versions in the F200 series.

Type A – Why This Matters in Three‑Phase Installations
Modern three‑phase equipment — VFDs, rectifiers, UPS systems, battery chargers, and anything with a switch‑mode power supply — can generate pulsating DC leakage currents. A Type AC RCCB might not detect these, leaving the installation unprotected. Type A detection covers both sinusoidal AC fault currents (traditional loads) and pulsating DC fault currents up to 6 mA smooth DC. For any installation containing electronic equipment, Type A is the minimum acceptable standard.

Electrical and Mechanical Specifications
The F204A‑40/0.03 is rated at 230/400 V AC, 50/60 Hz, with a 30 mA residual current sensitivity. Short‑circuit withstand capacity is 10 kA when protected by an upstream gG 100 A fuse or a suitably rated MCB. Surge current withstand is 5 kA, providing immunity against short‑duration leakage peaks from switching transients or lightning strikes. The device occupies 70 mm width (4 modules) on a 35 mm DIN rail, with dimensions 85 mm (height) × 69 mm (mounting depth). Weight is approximately 410 g. Terminals accept solid conductors up to 25 mm² or stranded up to 16 mm², with a tightening torque of 2.8 N·m. Operating temperature range is –25 °C to +55 °C. Mechanical endurance is 20,000 cycles; electrical endurance is 10,000 cycles.

Coordination and Accessories
As with all RCCBs, the F204A‑40/0.03 provides earth fault protection only. Short‑circuit protection must be provided by an upstream MCB or fuse. For a 40 A rated circuit, a 40 A C‑curve MCB upstream is the typical combination. The device is compatible with ABB S2C‑S/H6R auxiliary/signal contacts, which can be mounted on the right side (up to three in sequence) for remote status indication or fault signalling. It also accepts comb‑type busbars for efficient multi‑pole distribution.

Installation Notes
Mounts onto 35 mm DIN rail per EN 60715. The device can be fed from top or bottom. The test button (UT) operates between 100 V and 240 V AC. For three‑phase TN‑S and TN‑C‑S systems, the 4‑pole configuration switches all live conductors including neutral, ensuring complete disconnection during a fault. Do not use a 4‑pole RCCB on a single‑phase system — it will work, but two poles will be unused and the device will be unnecessarily wide.

Compliance and Origin
Complies with DIN VDE 0664 Part 1, DIN VDE 0664 Part 11, and EN 61008-2-1. Country of origin is Italy. RoHS compliant, SVHC‑free. EAN: 8012542783503.