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Home > Interface and Driver Circuit
GF4146 Datasheet






The UTC GF4146 is a two-wire low-power controller for  Residual

Current Devices (RCD) and AC outlet Appliance Leakage Circuit

Interrupters (ALCI) . The UTC GF4146 detects hazardous grounding

conditions and open circuits the line before a harmful shock occurs.  

Internally, the UTC GF4146 contains a diode rectifier, 12V shunt

regulator using a precision temperature-compensated bandgap

reference, precision low VOS offset-sense amplifier, time delay noise

filter, window-detection comparators, and a SCR driver. With the

addition of a minimum number of external components, the UTC

GF4146 detects and protects against a hot-wire-to-ground fault.

The UTC  GF4146 circuitry has a built-in rectifier and shunt

regulator that operates with a low quiescent current. This allows for a

high-value, low-wattage-series supply resistor.

The internal temperature compensated shunt regulator, sense amplifier, and bias circuitry provide for precision

ground-fault detection. The low VOS offset-sense amplifier allows direct coupling of the sense coil to the amplifier’s

feedback signal. This eliminates the large 50/60Hz AC-coupling capacitor. The internal delay filter rejects

high-frequency noise spikes common with inductive loads. This decreases false nuisance tripping. The internal

SCR driver is temperature compensated and designed to satisfy the current requirements for a wide selection of

external SCRs.




* For Two-Wire ALCI and RCD Applications

* Precision Sense Amplifier and Bandgap Reference

* Built-in AC Rectifier

* Direct DC Coupled to Sense Coil

* Low-Voltage SCR Disable

* Adjustable Sensitivity

* Built-in Noise Filter  

* SCR Gate Driver  

* Minimum External Components    

* Meets UL 943B Requirements  

* Ideal for 120V or 220V Systems

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