ABB MAKEUA30-30-10RA 230-240V 50Hz / 240-260V 60Hz

By OEM Update Editorial December 16, 2019 12:49 pm IST

UA30..RA 3-pole contactors for capacitor switching, can be used in installations in which the peak current far exceeds 100 times nominal rms current. The contactors are delivered complete with their damping resistors and must be used without additional inductances. The capacitors must be discharged (maximum residual voltage at terminals ≤ 50 V) before being re-energised when the contactors are making. Their electrical durability is 250 000 operating cycles for Ue< 500 V and 100 000 operating cycles for 500 V ≤ Ue ≤ 690 V. The UA..RA contactors are fitted with a special front mounted block, which ensures the serial insertion of 3 damping resistors into the circuit to limit the current peak on energisation of the capacitor bank. Their connection also ensures capacitor precharging in order to limit the second current peak occurring upon making of the main poles. The insertion of resistors allows to damp the highest current peak of the capacitor when switching on, whatever its level. The UA..RA series 3-pole contactors are of the block type design. – Main poles and auxiliary contacts: 3 main poles, 1 built-in auxiliary contact – Control circuit: AC operated with laminated magnet circuit – Accessories: a wide range of accessories is available.

Capacitor Transient Conditions
In Low Voltage industrial installations, capacitors are mainly used for reactive energy correction (raising the power factor). When these capacitors are energised, over currents of high amplitude and high frequencies (3 to 15 kHz) occur during the transient period (1 to 2 ms). The amplitude of these current peaks, also known as “inrush current peaks”, depends on the following factors:

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