UA95...RA 3-pole contactors for capacitor switching, can be used in systems where the peak current is much higher than 100 times the rated effective current. The contactors are supplied complete with their damping resistors and must be used without additional inductors (see table below). The capacitors must be discharged (maximum residual voltage on the terminals 50 V) before the contactors are switched on again in the closed state. Their electrical life is 250 000 operations at Ue < 500 V and 100 000 operations at 500 V Ue 690 V. The UA..RA contactors are equipped with a special front block that ensures the serial insertion of 3 damping resistors in the circuit to limit the current peak when the capacitor bank is excited. Their connection also ensures the pre-charging of the capacitors to limit the second current peak when the main poles are switched on. By using resistors, the highest current peak of the capacitor can be dampened when switched on, regardless of its magnitude. The 3-pole contactors of the UA...RA series are designed in block construction. , - Main poles: 3 main poles , - Control circuit: AC operated with laminated magnetic circuit, - Accessories: a wide range of accessories is available.
| Property | Value |
| Connection type main circuit: | other |
| Rated reactive power at 400 V, 50 Hz: | 60 kvar |
| Voltage type for actuation: | AC |
| Number of normally open contacts as main contacts: | 3 |
| Rated control supply voltage AC 50 Hz: | 24 V |
| Rated control supply voltage AC 60 Hz: | 24 V |
