Contactors for Capacitor Banks are specialized devices for switching capacitors in power factor correction systems. They are built to withstand the high inrush currents during capacitor energization by using pre-charge resistors, which protect system components, extend capacitor lifespan, and minimize network distortions.
Capacitor duty contactors CEM CK..N are specifically designed for switching capacitor banks in automatic reactive power compensation systems. They operate according to the AC-6b category of use, which is suitable for switching capacitive loads.
A key feature of most models (CEM 10CK to CEM 70CK) is the inclusion of integrated auxiliary contacts (early make) with precharge resistors. When switching a capacitor ON, these auxiliary contacts close first, which limits the inrush current by forcing it through the precharge resistors. The main contacts close a few milliseconds later. This process significantly reduces the inrush current, contributing to a longer lifespan for the equipment.
The models CEM 2,5CK, CEM 5CK, and CEM 7,5CK are exceptions; they do not have integrated auxiliary contacts or precharge resistors due to the smaller capacitor powers they are designed for.
When selecting a contactor, it is important to choose one based on the power capacity of the capacitors. For group and centralized reactive power compensation systems without detuning reactors, it is recommended to use over-sized contactors (Contactor nominal power > capacitor rated power) for a longer lifespan experience.
The CEM CK series can be presented in two groups based on the presence of the integrated precharge resistors.
Group 1: Models without Integrated Precharge Resistors and Early Auxiliary Contacts. These contactors are suitable for smaller capacitor powers and do not include built-in precharge resistors or early make auxiliary contacts. For these models (CEM 2,5-70CK..N), an additional auxiliary contact block BCMLE11 (1NO + 1NC) is available and can be mounted on either side of the contactor.
Group 2: Models with Integrated Precharge Resistors and Early Auxiliary Contacts. These contactors feature the technology to limit inrush current with integrated precharge resistors and early make auxiliary contacts. Similar to the smaller models, an additional auxiliary contact block BCMLE11 (1NO + 1NC) is also available and can be mounted on either side for these models (CEM 2,5-70CK..N)
Why Use Contactors for Capacitor Banks?
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