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RFK/Y XXX RRRR 5%
Y T : Internal thermal switch 160±5°C (rated voltage: 250 V; rated current: 2,5 A; leads single core conductor silicone rubber insulated cross section 0,25 mm2 length 300 mm).
XXX Model 250, 350, 500
RRRR Resistance value (nominal at 20°C)
RFK 500 150R 5%
RFK is the name of the product
500 is the model
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