The most important features of the resistor design:

The design is resistant to weather conditions.

The resistor is of so-called open design compliant with the EN-60322 standard with the IP20, where resistor’s active elements (being under voltage) are exposed to atmospheric conditions such as: rain, snow, pollution, etc. It is made entirely of stainless materials, or covered with anti-corrosive layers (copper busbars). It has a rainwater drainage system.

Konstrukcja odporna na wibracje:

Poszczególne połączenia części konstrukcji rezystora są wykonane połączeniami śrubowymi (brak spawania), przez co zwraca się szczególną uwagę na odpowiedni dobór rodzaju połączeń śrubowych oraz momentów ich dokręcania. Rozwiązanie takie gwarantuje, że połączenia nie rozkręcą się podczas pracy na pojeździe. Dodatkowo dla rezystorów prototypowych wykonywane są badania odporności na wibracje zgodnie z normą EN-61373

Vibration resistant design:

The individual connections of the resistor design parts are made with screw connections (no welding), which pays special attention to the appropriate selection of the screw connection type and the tightening torques. This solution guarantees that the connections will not be unscrewed while operating on the vehicle. Additionally, for the prototype resistors, vibration resistance tests are carried out in accordance with the EN-61373 standard

The design is resistant to high temperatures.

The resistance elements of the resistors warm up during operation up to temperatures around 600°C, which causes their elongation and the possibility of contact with each other and, as a consequence, internal short-circuits of a resistor. Therefore, the design of SIMPAX resistors is made in such a way as to compensate for the thermal expansion of the steel. Resistor enclosures are made of stainless steel resistant to high temperatures.

Its design includes the following aspects:

• the most efficient air exchange possible, resulting in better cooling of the resistor
• special construction of the bottom of the enclosure protecting against heating the roof of the vehicle above 80˚C, however, ensuring adequate water drainage
• protection against heating of elements located directly behind the resistor while the vehicle is moving – the heat is discharged only upwards
• special orientation of the upper flaps of the enclosure, thanks to which they deform in a controlled manner during heating, without reducing the air gaps from the resistance elements
• outputting resistor connection terminals to a place where there are no high temperatures.