METRIC STANDARS

Mechanical Tolerances

  • A & B- Exterior dimensions. Held to a minimum tolerance, only to ensure overall enclosure fit.
  • D & E- Dimension held to + tolerance to insure magnetic qualities under all applications.
  • F & G- Window dimensions. Held to a minimum tolerance, only to ensure coil fit.

MEASURMENT:

  • D- Dimension measured by caliper at any point on either core half.
  • E- Dimension measured at the butt joint.
  • F & G- Dimension measured at the shortest point, at least twice the radius R from the edge of the window.
Quality
grade
Quality
code
Thickness,
mm
Test
conditions,(3)
Guaranteed values for bonded,
cut or uncut cores
Bm, T f, Hz W/kg (4) VARm/kg (1) VARg/kg (2)
Standard ELA 0.30 1.7 50 2.4 9.90 27xAc minWt. min(a=0.075mm)
Standard ELH 0.10 1.5 400 26.4 28.60 111xAc minWt. min(a=0.05mm)
  1. VARm/kg – specific reactive power of metal.
  2. VARg/kg  – specific reactive power of air-gap, a = air-gap length
  3. Test conditions based upon mono-phase excitation of center leg.
  4. Values are 20% higher than for C-core because of third harmonic flux.

For Electrical Guarantees and Core Dimensions List, Please register

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