ILR line / commutation reactors, u_k 2 % and 4 %, 400 V

Derating – higher ambient temperature and altitude (general curve)

Ratings apply up to Ta 45 °C and 1000 m with natural cooling. Above that, multiply the rated current by both factors: I_perm = k_T × k_H × I_rated. Valid for aluminium and copper windings.

For line reactors the factor applies to the rated current I_n including converter harmonics; inductance and u_k do not change. Example: LR3063-50-471 at Ta 55 °C and 2000 m → k = 0.93 × 0.98 = 0.91; permissible continuous current 0.91 × 63 A ≈ 57 A. For a 63 A drive choose the next rating, LR3080-50-371.

Basis: winding temperature rise ΔT ∝ P^0.826 with losses ∝ I² (k_T); convective heat transfer ∝ √(air density) with radiation unchanged (k_H). The curves assume the type is fully loaded at its rating, so most types have some extra margin. No uprating below 45 °C. Above 2000 m the insulation clearances must be checked, especially for 690 V types; forced air or derating beyond 70 °C / 4000 m on request.

Mechanical outline – ILR series (schematic)

• AOverall width (mounting feet)
• BOverall depth (mounting feet)
• COverall height incl. terminals
• DWinding depth
• n1Mounting pitch, width
• n2Mounting pitch, depth

Schematic – not to scale. A, B, C, n1 and n2 for each type are given in the product table; the dimensioned drawing of every type is on page 3 of its datasheet. Slotted holes for M8 (M10 from A ≥ 320 mm); Cu bar terminals above 160 A.