FM2147B-SO-T-G

FM2147B is a high-performance dedicated IC for residual current devices (RCDs). It integrates a regulated power supply, amplifier circuit, comparator circuit, trip controller, and trip driver circuit. External components include a trip coil, varistor, Zener diode, diode, resistors, and capacitors. The FM2147B RCD dedicated IC is used to detect leakage signals on the live and neutral lines. When a leakage signal occurs, the zero-sequence current transformer (ZCT) detects the electrical signal, and its secondary winding output serves as the input to the RCD chip. The leakage signal can be AC type or A type (including 0°, 90°, and 135° leakage signals). When the RMS value of the residual current exceeds the rated current (rms) specified by the RCD, the output pin TRIG generates an action-level pulse with a pulse width greater than 20ms.

Key features

• Direct SCR drive; TRIG output pulse width >20ms upon leakage signal detection
• Compatible with Type A (including Type AC) leakage signals
• Consistent trip accuracy across all leakage signal types
• Robust EMC protection
• Operating voltage: 110V–220V (50Hz–60Hz)
• Wide temperature range: -40–+85°C
• Adjustable trip delay