Cemented and enamelled wiredound resistors model SMA

Professional resistors with fine electrical and mechanical characteristics, indicated for use where high power is required, along with safe operation and durability.
The external lining is protected by a layer of vitreous enamel.
The resistive element consists of wire in Ni-Cr alloy or twisted constantan, on an extremely pure 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.


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


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.


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