GFCI and ALCI Transformer Coil Assemblies

GFCI and ALCI Transformer Coil Assemblies

Magnetic Metals offers wound GFCI 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 remanent state.

The GFCI differential transformers are normally wound with 1000 turns of 38 AWG to 40 AWG magnet wire and are placed in pinned core holders for easy circuit board mounting. The pins can be bent for horizontal or vertical mounting depending on the construction of the GFCI device.

The table below is a list of our standard GFCI differential transformers.

 

 

MMC Part Numbers/ Drawings

Core Part Numbers

Turns

DCR (Ohms) Typical

ID (Inches)

Lead Termination

Comments

Typical Applications

Download PDF drawing
AS5826-XX

5022

1500

104

0.21

Pins

Separate Sense/Differential Coil

GFCI, ALCI

Download PDF drawing
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

Download PDF drawing
AS5859-01

5029 / F3006

1000 / 300

45 / 16

See Dwg

Pins

Combined Sense/Differential Coil & Ground-to-Neutral Coils

GFCI, ALCI, ARC FAULT

Download PDF drawing
AS5859-02

5029 / F3006

1000 / 300

45 / 16

Pins

Download PDF drawing
AS5859-03

5029 / F3006

1000 / 120

45 / 7.5

Pins

*Includes reset winding.

Download PDF drawing
A07-3095

5029

2000

146

0.21

Pins

Sense/Differential Coil

GFCI, ALCI, ARC FAULT

Download PDF drawing
AS5930-03

5026

1000

71

0.295

Pins

Sense/Differential Coil

Download PDF drawing
AS5976-01

5002

1000

75

0.47

Pins

Sense/Differential Coil

GFCI HIGH CURRENT

Download PDF drawing
AS5976-03

5002

1000

75

0.47

Pins

Sense/Differential Coil

Download PDF drawing
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

Download PDF drawing
A08-3461-02

5045

1000

45.5

0.78

Pins

Sense/Differential Coil

 

Download PDF drawing
A08-3461-04

5045

1000

15.8

0.78

Pins

Sense/Differential Coil

Download PDF drawing
A08-3461-05

5045

1000

45.5

0.78

Pins

Sense/Differential Coil

Download PDF drawing
A08-3461-06

5045

1000

45.5

0.78

Pins

Sense/Differential Coil, Potted

GFCI HIGH CURRENT

Download PDF drawing
A08-3461-08

5045

1500/120

68/6

0.78

Pins

Combined Sense/Differential Coil & Ground-to-Neutral Coil
*Includes reset winding.

 

Download PDF drawing
A08-3461-10

5045

1000

84

0.78

Lead Wire

Sense/Differential Coil

 

 

ALCI and Arc Fault sensor transformers with a temperature stability of 0oC to 80oC are available in all of the above parts. Please indicate this requirement upon ordering.

A Ground to Neutral Short Detection Coil is required by UL Standard 943 to meet the tripping of the GFCI device when the resistance between the ground and neutral wire drops below a minimum value. The generally accepted method to accomplish this is to induce an isolated voltage in the neutral wire, which when shorted to the ground, will produce a signal in the sensor core and trip the device. Either 60 Hz inductors or the dormant oscillator approach as described in the IC manufacturer’s circuit information are used. For the dormant oscillator approach we recommend any of the above part numbers utilizing the ferrite core F3XXX series.

 


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GFCI and ALCI Transformer Coil Assemblies Page