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Legrand 4P 25A 300mA RCCB (DX3) – residential

The Legrand DX3 RCCB FP 25A 300mA is a four-pole residual current circuit breaker designed for residential main incomer applications. Operating at 400V with a 25A rated current, this Type AC device provides dedicated earth leakage protection without integrated overload or short circuit functions.

Quick Answer

Yes, the Legrand DX3 RCCB FP 25A 300mA is a vital purchase if dedicated fire protection from earth leakage is your primary concern for a residential main incomer. Its 300mA sensitivity specifically addresses fire risks in distribution boards. Crucially, pair it with an MCB for complete overload/short-circuit protection, as this unit focuses solely on earth fault detection, not personal shock protection.

✓Rapidly disconnects power to prevent fire — 300mA sensitivity trips the circuit in less than 300ms at 1x Idn.
✓10kA conditional short circuit rating ensures the unit withstands high-fault currents when paired with an MCB.
✓Enhanced safety for family and property — Instantaneous tripping class reacts immediately to leakage faults.
✓850°C glow wire test rating ensures the housing remains fire-retardant under extreme thermal stress.
✓Saves energy through efficient design — 1.5W power loss per pole reduces heat buildup in your distribution board.
✓BIS certified safety compliance — Meets IS 12640 1 and IS 12640 2 standards for Indian homes.

The Legrand 4P 25A 300mA RCCB is ideal for Indian homeowners prioritizing fire safety in their residential main incomer against earth leakage. Avoid if you need personal shock protection or a combined MCB/RCCB, as this unit is dedicated solely to 300mA fire hazard prevention.

Product Overview
The Legrand DX3 RCCB FP 25A 300mA is a four-pole residual current circuit breaker designed for residential main incomer applications. Operating at 400V with a 25A rated current, this Type AC device provides dedicated earth leakage protection without integrated overload or short circuit functions.

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Engineering Analysis
A 300mA sensitivity level is specifically chosen for fire protection in residential distribution boards where lower sensitivity might cause nuisance tripping. The 500A making and breaking capacity ensures the device can safely manage operational surges, while the 4P configuration provides complete isolation of three phases and the neutral line.

Technical Support & FAQs