SIGMA, UL Listed Version
The resistor components consist of fully welded wire wound ceramic resistors, which is a well-known and approved technology.
The base material is corderite, which is a type of ceramic with a very high resistance to temperature changes and the wire is coated with aluminium phosphate to protect the wire and conduct the heat developed in the wire on to the ceramic core. Aluminium-phosphate is stable at 500°C.
The resistor cages comply with IP21 when mounted vertically (otherwise IP20) giving electrical and thermal protection. The resistors have a nominal load from 430W and upward and are particularly suitable for pulse loads of 10 – 20 times more compared to the nominal load. This is due to the ceramic core material and an extra high weight of wire.
We have developed Thermal Simulation corresponding to all resistor types and resistor values. By using these models we are able to calculate the temperature rises in the resistor wire for all possible load situations. Danotherm offers assistance to customers in finding the optimum solution for any situation.
Specifications
| Power Range | 430W - 4855W (Average) |
| Pulse Load | 25 * PN in 1 sec; 10*PN in 10 s |
| De-rating | Linear @ 40°C: 100% - @70°C: 0.5 * PN |
| Environmental | -40°C- 90 °C |
| Resistance Tolerance | ±10% |
| Dielectric Strength | 2500VAC, 1 Minute |
| Working Voltage | 600V |
| Insulation Resistance | >20M OHM |
| Protection class | IP21, Type 1X |
| Max surface temperature | 350°C |
| Thermo watch (optional) | 250°C |
| Connection | Screw |
| Climatic | EN 60 068-2-2 |
| Vibration | EN 60 068-2-6 |
| Approvals | UL 508. Listed File E208678 |
| Norms | UL 508 |
