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Ring Cores

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.

Our unique heat treating furnace and annealing process produce the highest quality magnetic components. Fully automated casing and 100% testing provides our 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, our Engineering Staff stands ready to assist you with any design consideration and performance issues.
Ring Cores For GFCI and ALCI

CORES FOR GFCI - 5000 SERIES (80% Nickel Alloy - 0.0132" thick)
CCORES FOR ALCI - 5100 SERIES (80 % Nickel Alloy - 0.0132" thick)

Sorted by Ring ID:

Ring Core
Color
Dimensions (Ring Stack)
Dimensions (Cased Unit)
l(Cm)
A(Cm2)
Approx.# Rings
/Core
I.D.
O.D.
Ht.
I.D.
O.D.
Ht.
5025
Green
0.305
0.405
0.119
0.265
0.455
0.195
2.83
0.0383
9
5029
Blue
0.348
0.480
0.066
0.305
0.530
0.108
3.30
0.0281
5
5137
Yellow
0.348
0.480
0.066
0.305
0.530
0.108
3.30
0.0281
5
5042
Black
0.375
0.500
0.066
0.320
0.560
0.113
3.49
0.0266
5
5022
Clear
0.375
0.500
0.119
0.320
0.560
0.195
3.49
0.0479
9
5040
Black
0.436
0.562
0.079
0.375
0.625
0.150
3.98
0.0322
6
5026
Blue
0.436
0.562
0.132
0.375
0.625
0.210
3.98
0.0536
10
5126
Gray
0.436
0.562
0.132
0.375
0.625
0.210
3.98
0.0536
10
5050
Black
0.523
0.705
0.066
0.465
0.775
0.140
4.90
0.0387
5
5150
Black
0.523
0.705
0.066
0.465
0.775
0.140
4.90
0.0387
5
5052
Black
0.600
0.756
0.079
0.540
0.820
0.145
5.41
0.0398
6
5002
Black
0.633
0.844
0.119
0.560
0.925
0.195
5.89
0.0808
9
5045
Black
1.000
1.250
0.119
0.920
1.335
0.195
9.02
0.0996
9

Sorted by Core Part Number:

Ring Core Color Dimensions (Ring Stack) Dimensions (Cased Unit) l(Cm) A(Cm2) Approx.# Rings
/Core
I.D. O.D. Ht. I.D. O.D. Ht.
5002 Black 0.633 0.844 0.119 0.560 0.925 0.195 5.89 0.0808 9
5022 Clear 0.375 0.500 0.119 0.320 0.560 0.195 3.49 0.0479 9
5025 Green 0.305 0.405 0.119 0.265 0.455 0.195 2.83 0.0383 9
5026 Blue 0.436 0.562 0.132 0.375 0.625 0.210 3.98 0.0536 10
5029 Blue 0.348 0.480 0.066 0.305 0.530 0.108 3.30 0.0281 5
5040 Black 0.436 0.562 0.079 0.375 0.625 0.150 3.98 0.0322 6
5042 Black 0.375 0.500 0.066 0.320 0.560 0.113 3.49 0.0266 5
5045 Black 1.000 1.260 0.119 0.920 1.335 0.195 9.02 0.0996 9
5050 Black 0.523 0.705 0.066 0.465 0.775 0.140 4.90 0.0387 5
5052 Black 0.600 0.756 0.079 0.540 0.820 0.145 5.41 0.0398 6
5126 Gray 0.436 0.562 0.132 0.375 0.625 0.210 3.98 0.0536 10
5137 Yellow 0.348 0.480 0.066 0.305 0.530 0.108 3.30 0.0281 5
5150 Black 0.523 0.705 0.066 0.465 0.775 0.140 4.90 0.0387 5

To download these tables, click here.

USING A MATERIAL THICKNESS OF 0.014" AS OPPOSED TO THE ACTUAL 0.0132". 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 0.014" THICKNESS.

Above permeability value is for comparison purpose only.