Cemented and enamelled wiredound resistors model RFC

These are industrial resistors with extremely high overload characteristics, which are mechanically very robust and non-inflammable, with excellent insulation and high dissipation capacity.
The external protection of the resistor consists of a ceramic cement lining.
The resistive element consists of wire in Ni-Cr alloy or twisted constantan, on an extremely high quality cylindrical ceramic support.
The resistors may be produced with different terminations depending on the model and ohm value, standard banner type B, with fast-on and pattern type terminals, and in versions with off-standard tolerances.

ELECTRICAL CHARACTERISTICS

· Standard tolerance: ± 10%
· Temperature coefficient ≤ 100 ppm/°C
· Insulation resistance > 100 Mohm (500 Vdc)
· Max operating temperature: 350 °C

OPTIONAL

A low induction Ayrton-Perry type winding can be provided on request.

MAXIMUM LOAD LIMIT

The nominal power Pn shown in the table refers to resistors placed horizontally and free in naturally circulating air, with an environmental temperature of 25° C.
With forced ventilation the nominal power dissipation capacity of the resistor increases as a function of the air speed.

STANDARD CHARACTERISTICS


 
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