Ring Cores

Ring cores made of thermally stable supermalloy and wound with 1000 turns are excellent transformers. Originally developed for ground fault detection current, they are now used in many current-sensing applications.  In a GFCI circuit breaker or electrical outlet, these cores constantly monitor electrical current and protect against injury or death caused by contact with damaged or defective electrical equipment.  In the ALCI plug, the cores are used to protect people from electrical shock by hairdryers or other appliances.  (They can have many uses in other applications).

Magnetic Metals manufactures standard size sensor cores of supermalloy for sensing fault current as well as cores made of ferrite for ground to neutral detection.  Sensing and neutral detection cores are available in a wide variety of sizes and type to fill any GFCI, Arc Fault or current sensing requirement.

The unique heat treating furnace and annealing process produce the highest quality magnetic components.  Fully automated casing and 100% testing provides customers with the most price competitive products and the best production yields in the industry.

As the largest supplier of sensor cores in the industry, Magnetic Metals' Engineering Staff are ready to assist with any design consideration and performance issues.

Ring Cores For GFCI and ALCI

CORES FOR GFCI   -  5000 SERIES (80 % Nickel Alloy - 0.33 mm thick)
CCORES FOR ALCI -  5100 SERIES (80 % Nickel Alloy - 0.33 mm thick)

Sorted by Ring ID:

Sorted by Core Part no.:

Note:  All cores that use the 3081 ring (5029, 5149, 5137, 5151) have been calculated using a material thickness of 0.35 mm as opposed to the actual 0.33 mm.  Additionally, the 5029 core calculations are based on a 4 rings core, instead of 5 rings in order to remain consistent with the original 5029 core, made with 4 rings of 0.35 mm thickness.