Description

The CFB663D is a 4-pole (3P+N) RCCB rated at 63A with 300mA Type B+ residual current sensitivity and a 10 kA conditional short-circuit current rating. Type B+ provides detection of smooth DC fault currents, pulsating DC, and AC residual currents across a frequency range up to 100 kHz, making it suitable for installations with variable frequency drives, EV chargers, and similar equipment.
The 300mA sensitivity classifies this as a fire protection and selective upstream device rather than personal protection. In three-phase TT systems, it is commonly used as the main incomer RCCB with individual 30mA devices on each branch circuit below. The biconnect bottom terminals and external blue test button simplify installation and commissioning.
The CFB663D has a 4-module DIN rail housing, IP20 rating, and operates at 230/400V AC. Dimensions are 85mm height, 72mm width, 70mm depth. It complies with IEC 61008 and EN 62423 standards.