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Leakage Protector Circuit


Ground fault circuit breaker controller. Built in diode rectifier bridge; For dual wire GFCI and RCD applications; Meet the requirements of UL943B standard; Used to detect dangerous grounding paths and ground to neutral faults.

Typical Applications

Three wire GFCI output interface; GFCI circuit breaker; Portable GFCI line; Detect and protect against live line to ground faults and zero line to load short circuits.

Working current (Max)


Latching time (Ton)


Packaging form


D4147 is a low-power ground fault circuit breaker (GFI) controller used to detect dangerous current paths to ground and ground to neutral faults. The application circuit of D4147 can disconnect the load before electric shock causes damage.
The D4147 internally includes a diode rectifier, a high-precision 12V bandgap parallel regulator, a precision low VOS offset induction amplifier, a delay noise filter, a window detection comparator, and a thyristor driver. By using as few external devices as possible, D4147 can detect and protect against live line to ground faults and zero line to load short circuits.
The D4147 circuit includes a built-in rectifier with low static current and a parallel regulator, so it can be paired with high resistance and low power current limiting resistors. Built in parallel voltage regulator with temperature compensation, induction amplifier, and bias circuit, providing high-precision ground fault detection. The low VOS offset induction amplifier allows the induction coil to be directly coupled to the feedback signal end of the amplifier, without the need for a large capacity 50/60Hz AC coupling capacitor. The built-in delay filter can filter out high-frequency noise spikes in inductive loads, reducing false and harmful triggering. The built-in thyristor driver has temperature compensation, which can meet the driving current requirements of most external thyristors.
D4147 is packaged in SOT-23-6


main features:

● Applied to GFCI and RCD
● Built in precision induction amplifier and bandgap reference
● Built in bridge rectifier
● Built in noise filter
● Negative half cycle SCR automatic reset
● Direct DC coupling to induction coil
● Thyristor gate driver
● Adjustable leakage sensitivity
● 400 μ A static current
● Less external components required
● Complies with UL943 standard
● Suitable for 120V or 220V systems
● Adopting SOT-23-6 packaging



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