DX3-ID 1P+N RCCB | 63A Residual Current Circuit Breaker

The DX3-ID is a compact 1P+N residual current circuit breaker for single-phase 230V circuits, designed to provide earth-leakage and shock protection on a DIN rail. The "ID" designation refers to the differential (residual current) function; it detects leakage between phase and earth and trips to cut both L and N when leakage exceeds the rated sensitivity.

It uses a core-balance (zero-sequence) current transformer through which L and N both pass. Under normal conditions the outgoing and returning currents cancel and no flux is produced. An earth fault or person touching live parts creates an imbalance; the toroid detects the residual current, a sensitive electromagnetic release operates, and the contacts open within milliseconds — typically well under 300 ms at IΔn.

One phase pole and one neutral pole are both switched and monitored. 63A (In) is the rated continuous current at 230V, 50/60 Hz, suitable for single-phase sub-mains and large socket-outlet groups. Like all RCCBs, it has no overcurrent trip function, so a separate MCB must protect the cables against overload and short circuit.

The standard version is rated at 30 mA (IΔn), the conventional value for additional protection against direct contact in residential and similar installations. Other sensitivities (10 mA for wet locations, 100/300 mA for upstream fire protection) are usually available in the same product family — verify the exact value marked on the product and in the datasheet.

Confirm the version in the datasheet. Type AC detects only sinusoidal AC residual current; Type A also detects pulsating DC residual current, which is essential when the load includes switching power supplies, LED drivers, inverter appliances, or EV chargers. For modern single-phase installations, Type A is generally the recommended and code-aligned choice.

Connect the incoming phase to the terminal marked L (IN) and the incoming neutral to N (IN); take the load L and N from the OUT terminals to downstream circuits. The protective earth (PE) conductor must never pass through the device or be connected to its terminals. Observe the L/N polarity printed on the housing, and keep the load-side neutral isolated from other circuits to avoid false residual current.

No. The DX3-ID RCCB trips only on residual (earth leakage) current. It will not disconnect on an overload or a line-to-neutral short circuit. Install an MCB (or use an RCBO) upstream or on the same rail to provide overload and short-circuit protection coordinated with the cable rating.

Frequent tripping is usually caused by: small intrinsic leakage from long cable runs or many electronic appliances, damp or damaged insulation, a shared neutral between circuits, surges/transients from nearby equipment, or a worn-out RCCB. To locate the fault, switch off all downstream MCBs, switch the RCCB on, then switch MCBs back on one at a time to identify the offending circuit. Never bypass or tape the test button to force the RCCB on.

Clip it onto a 35 mm DIN rail in the distribution board, tighten conductors to the torque on the label (typically ~1.2–1.5 N·m for 1P+N 63A), and leave the handle accessible. Press the "T" test button once a month — with the circuit energized — and the device should trip immediately; if it does not, replace it. Periodically check terminal torque and enclosure condition during routine electrical inspections.

It is manufactured to IEC 61008-1 (residual current operated circuit-breakers without integral overcurrent protection for household and similar uses), rated up to 440V AC and 125A. CE marking under the Low Voltage and EMC Directives confirms product conformity for sale and installation in IEC-aligned markets. Verify the IΔn, Type (AC/A), and tripping time/current characteristic in the datasheet before ordering.