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RCE/Y XXX RRRR 5%
Y N : not inductive version
R : adjustable version
XXX Model / Rated power I.E. 300 : 300W
RRRR Resistance value (nominal at 20°C)
RCE 300 150R 5%
RCE is the name of the product 300 is the model that corresponds, for RCE family, to the rated power, in this case 300 W
150R means 150 Ω that is the nominal ohmic value at 20°C
5% is the tolerance on the ohmic value, in this case the value of the resistor is accepted when is within 142.5 Ω ÷ 157.5 Ω