Inductive load units, Chokes for switch and relay testing
Description
Electrical switches must pass many different tests during the approval phase. Some of these tests concern the switching behavior under various load conditions. The switch is tested under nominal load, overload, and various power factors (cosϕ). Besides continuous load, switch-on and switch-off operations are also examined. During this process, it is crucial not to change the set parameters throughout the entire test. In the past, air-core chokes were used as inductive loads because they exhibit almost no saturation. However, air-core chokes are larger and have a stronger stray field than comparable iron-core chokes with equivalent magnetic energy. To adjust the respective power factor (cosϕ) value, additionally adapted Resistors must be connected. To meet all specified test points, many different inductive and ohmic loads must be available.
Advantages
- Optimized linearity, thus no saturation in the respective operating range
- multiple taps, only a few chokes are needed instead of many
- Optimized winding resistance, thereby reducing ohmic loads
- Designed for continuous and short-term load
- Cost reduction through optimization of weight and dimensions
- High nominal voltage, standard up to 1000 V
Technical data*
| Tap | Inductance L | Nominal current Irms | Linear up to Ilin | Nominal voltage Ur | Degree of protection |
| L2 | 115 mH | 2 A | 8 A | 1000 V | IP 00 |
|---|---|---|---|---|---|
| L3 | 190 mH | 8 A | |||
| L4 | 240 mH | 6 A | |||
| L5 | 300 mH | 6 A | |||
| L6 | 370 mH | 5 A | |||
| L7 | 410 mH | 4 A | |||
| L8 | 440 mH | 4 A | |||
| Lr | 450 mH | 4 A |
All data and configurations can be found in our product datasheet.
