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.
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