| Series | Product Image | Protection class | Max power | Special Versions | Resistance Value | PDF | Supplier |
| RFK |   | IP55 | 250W .. 800W | Not-inductive, customized cables, UL version available on request | 0.2 .. 50K |  |  |
| RFD |   | IP54 | 50W .. 550W | Not-inductive, special insulation, thermal switch, heat-sink, special cables | -- |  |  |
| RFX |   | IP20 | 50W .. 400W | Not-inductive, Customized cables, UL version on request | 1.5 .. 21K |  |  |