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Legrand 4P 63A 300mA RCCB (DX3) – [Home Fire Safety]

The Legrand DX3 RCCB FP 63A 300mA is a four-pole (4P) Type AC residual current circuit breaker designed for high-load residential main incomer applications.Rated for 230V operation, this device monitors 50Hz circuits to detect insulation failures and prevent electrical fires.

Quick Answer

Invest in the Legrand DX3 4P 63A 300mA RCCB if you need fire protection for a 3-phase domestic connection with high leakage tolerance. Its 10kA capacity ensures robust safety at the main board where 30mA units might trip prematurely. It is essential for multi-story Indian villas requiring high-load stability.

✓Prevents electrical fires in residential structures — 300mA sensitivity detects dangerous insulation leaks.
✓Rated current of 63A supports heavy domestic loads through a 4-pole main incomer configuration.
✓Reduces downtime from minor power surges — 2kV surge withstand protects the internal mechanism.
✓Breaking capacity of 10kA ensures the device survives high-energy faults in the distribution panel.
✓Visual confirmation of safety status — grey test button and trip indicator provide immediate diagnostic feedback.
✓Mechanical endurance of 10,000 cycles guarantees years of reliable switching in 230V environments.

This 63A 300mA DX3 unit is perfect for main incomer fire safety but unsuitable for direct shock protection in wet areas like bathrooms where 30mA is required. It balances high-load reliability with critical insulation fault monitoring.

Product Overview
The Legrand DX3 RCCB FP 63A 300mA is a four-pole (4P) Type AC residual current circuit breaker designed for high-load residential main incomer applications. Rated for 230V operation, this device monitors 50Hz circuits to detect insulation failures and prevent electrical fires. Its primary function is providing earth leakage protection in distribution boards where standard MCBs cannot detect low-level leakage currents.

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Engineering Analysis
The 300mA sensitivity is specifically chosen for fire protection in residential settings where a 30mA device might cause nuisance tripping on long cable runs. With a 10kA breaking capacity, this RCCB handles high fault levels at the main incomer when coordinated with a backup MCB. The 4P configuration ensures that the neutral line is switched along with the three phases, providing total isolation during 300ms instantaneous tripping events.

Technical Support & FAQs