Cemented and enamelled wiredound resistors model PM

These resistors are designed to obtain maximum power dissipation under optimum operating conditions.
The resistive wire is wound on a suitable ceramic support to sustain high thermal shock and is covered with inorganic cement resistant to solvents. The protection offered is not only non-inflammable, but is also sufficient for normal environmental conditions. The temperature resistance of the cement is greater than the fusion temperature of the winding wire.
The connections are realised with standard collars or terminal pressure plugs (fast-on); the electric contact is guaranteed by rivets or (on request) by screws.


· Standard tolerance: ± 5%
· Temperature coefficient ≤ 100 ppm/°C
· Insulation resistance > 100 Mohm (500 Vdc)
· Max operating temperature: 350 °C


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


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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