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Legrand 4P 40A 30mA RCCB (DX3 HPI FP) – Residential

The Legrand DX3 RCCB HPI FP 40A 30mA is a four-pole (4P) residual current circuit breaker designed for 40A residential circuits.Installed in your final circuit, this device provides essential earth leakage protection by monitoring the balance between phase and neutral currents.

Quick Answer

Yes, the Legrand DX3 HPI FP 4P 40A 30mA RCCB is an indispensable purchase for enhancing safety in your Indian residence. It's purpose-built to prevent life-threatening electrocution and electrical fires by rapidly disconnecting power at a critical 30mA leakage. Its 4-pole design and 40A rating make it ideal for main circuit protection, ensuring reliable operation for high-load residential applications.

✓Protects your family from direct contact shocks — 30mA Type A sensitivity detects both AC and pulsating DC leakages
✓10kA conditional short circuit rating — ensures the device remains intact when used with a coordinated backup MCB
✓Flame-retardant casing for superior fire safety — UL94 V2 flammability rating and 850°C glow wire test compliance
✓Compact 4-module design (72mm width) — saves significant space in standard residential DIN rail distribution boards
✓Visual peace of mind with manual testing — grey test button allows for monthly functional verification of the trip mechanism
✓Reliable 4kV impulse withstand voltage — protects the internal circuitry against sudden atmospheric or switching surges

Essential for Indian homeowners and electricians, the Legrand DX3 HPI FP 4P 40A 30mA RCCB provides critical 30mA earth leakage protection against electrocution and fire in 400V residential systems. Choose it for human safety, but avoid if your primary need includes overload or short-circuit protection.

Product Overview
The Legrand DX3 RCCB HPI FP 40A 30mA is a four-pole (4P) residual current circuit breaker designed for 40A residential circuits. Installed in your final circuit, this device provides essential earth leakage protection by monitoring the balance between phase and neutral currents. Its primary function is to prevent electrocution and electrical fires by disconnecting the 400V supply when a 30mA leakage is detected.

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Engineering Analysis
A 30mA sensitivity rating is critical for residential safety as it is the threshold required to protect human life from cardiac fibrillation during accidental contact. The 630A making/breaking capacity ensures the device can safely manage high-current connecting and disconnecting events without internal welding. Providing 4P protection across four modules (72mm width) allows for a complete isolation of all phases and the neutral line in three-phase home wiring.

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