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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 fire safety from persistent earth leakages is your top priority in an Indian residential system. It acts as a crucial main incomer for detecting currents too low for MCBs but high enough to cause ignition. Opt for this if you need robust fire protection without frequent nuisance tripping from smaller appliance faults. Its 630A capacity handles connection surges efficiently.

✓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.

This Legrand DX3 RCCB provides essential 300mA fire protection from earth leakages for Indian residential main panels. Buy for dedicated fire safety; avoid if 30mA personal shock protection or MCB overload/short-circuit functions are your prime need.

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.

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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