C.A. Spalding offers wound GFCI and AFCI differential transformers to those customers who do not want to wind and assemble their own components.

The cores used in differential transformers reliably measure ground faults of 5mA, 10mA, 30mA or more over the temperature range from -35oC to +80oC as required by UL Standard 943.

This is accomplished through the use of high permeability core materials in ring form. The high permeability is maintained after low resistance faults, which could drive the core into saturation and leave it in the remnant state.

Our group of engineers have more than 30 years of experience in the matter will be able to work closely with customers on their projects. 

Please refer to our list of standard available products and drawings to select an option:

MMC Part Numbers/ Drawings Core Part Numbers Turns DCR (Ohms) Typical ID (Inches) Lead Termination Comments Typical Applications
AS5826-XX 5022 1500 104 0.21 Pins Separate Sense/Differential Coil GFCI, ALCI
AS5827-XX 5029,5202 5301,F3006 1000 40 0.22 Pins Available as Separate Sense/Differential Coils & Ground to Neutral Coils GFCI, ALCI, ARC FAULT
AS5859-01 5029 / F3006 1000 / 300 45 / 16 See Dwg Pins Combined Sense/Differential Coil & Ground-to-Neutral Coils GFCI, ALCI, ARC FAULT
AS5859-02 5029 / F3006 1000 / 300 45 / 16 Pins
AS5859-03 5029 / F3006 1000 / 120 45 / 7.5 Pins *Includes reset winding.
A07-3095 5029 2000 146 0.21 Pins Sense/Differential Coil GFCI, ALCI, ARC FAULT
AS5930-03 5026 1000 71 0.295 Pins Sense/Differential Coil
AS5976-01 5002 1000 75 0.47 Pins Sense/Differential Coil GFCI HIGH CURRENT
AS5976-03 5002 1000 75 0.47 Pins Sense/Differential Coil
A08-3461 5045 / F3021 1000 / 200 45 / 9 0.78 Pins Combined Sense/Differential Coil & Ground-to-Neutral Coil *Includes reset winding. GFCI HIGH CURRENT
A08-3461-02 5045 1000 45.5 0.78 Pins Sense/Differential Coil
A08-3461-04 5045 1000 15.8 0.78 Pins Sense/Differential Coil
A08-3461-05 5045 1000 45.5 0.78 Pins Sense/Differential Coil
A08-3461-06 5045 1000 45.5 0.78 Pins Sense/Differential Coil, Potted GFCI HIGH CURRENT
A08-3461-08 5045 1500/120 68/6 0.78 Pins Combined Sense/Differential Coil & Ground-to-Neutral Coil *Includes reset winding.
A08-3461-10 5045 1000 84 0.78 Lead Wire Sense/Differential Coil

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