New braking resistors
Flat and safe
A new type of safe braking resistor from Michael Koch is just under ten millimeters high.
Compared to the braking resistors in the aluminum profile with similar performance, this is a good five millimetres less, which can make all the difference in some environments. The maximum length is 246 millimeters with a width of 60 millimeters. The rated power is 120 watts, but the safe braking resistor absorbs around 4,500 watt seconds of energy at one percent duty cycle, i.e. 1.2 seconds per two minutes. The maximum operating voltage is 1,000 volts DC and the available range of resistance values is between 27 and 200 ohms. With a mass of around 300 grams, the thermal time constant of the pressed wire resistor is around 400 seconds.
The new series with the type designation AWD300 therefore meets the requirements for connection to the braking transistors of frequency converters that are operated on a 400 V mains supply. With its sturdy aluminum housing and pressed seals, the braking resistor achieves at least protection class IP 54. Koch promises to have implemented the safety features that the entire company stands for in the new braking resistor as well: In the event of permanent overload, only the resistor is destroyed in an expected manner; the periphery remains undamaged if the installation conditions are taken into account. as
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