FatafatService Logo
No Image Available

Legrand 4P 40A 300mA RCCB (DX3) – Residential Use

The Legrand DX3 RCCB FP 40A 300mA is a four-pole (4P) current-operated safety device designed for 400V residential distribution systems. Installed as a main incomer, it provides essential earth leakage protection by monitoring the vector sum of currents across all phases and the neutral conductor.

Quick Answer

Yes, you should buy the Legrand DX3 4P 40A 300mA RCCB if you prioritize advanced fire safety for your Indian residence. This device acts as a critical main incomer, specifically designed to detect and prevent ignition risks from persistent earth leakages too low for MCBs. Its robust 630A capacity ensures reliable operation against common connection surges.

✓Prevents electrical fires in residential properties — 300mA sensitivity trips current flow before heat ignites materials.
✓10kA conditional short circuit rating — provides robust endurance when coordinated with a backup MCB in distribution boards.
✓Protects against voltage fluctuations — the operating range of 180V to 264V ensures stability during local power swings.
✓1.5W power loss per pole — limits thermal dissipation within the panel for better component longevity.
✓Ensures complete isolation of three-phase circuits — 4P (four pole) configuration disconnects all live conductors and the neutral.
✓4kV impulse withstand voltage — shields sensitive home electronics from sudden transient power surges.

Select this Legrand 4P 40A 300mA RCCB if robust fire protection from earth leakages is critical for your residential main incomer. Avoid if you require short-circuit or overload protection; its 300mA sensitivity specifically targets fire prevention, not broader electrical fault coverage.

Product Overview
The Legrand DX3 RCCB FP 40A 300mA is a four-pole (4P) current-operated safety device designed for 400V residential distribution systems. Installed as a main incomer, it provides essential earth leakage protection by monitoring the vector sum of currents across all phases and the neutral conductor.

Related Products

Engineering Analysis
The 300mA sensitivity is specifically engineered for fire protection, as it detects leakages that are too low to trip an MCB but high enough to cause ignition. Its 630A making and breaking capacity allows the device to safely handle connection surges, while the four-pole configuration ensures total isolation of three-phase loads and the neutral line.

Technical Support & FAQs