Low Voltage Power Supply Reactive Power Compensation Cabinet Components

As a fundamental Low voltage power supply reactive power compensation cabinet components, the CJ19C single-phase series contactor is a specialized device designed for switching low-voltage single-phase capacitors or for split compensation in three-phase capacitor banks. It is a core element within automatic compensation equipment used for reactive power correction. This essential product is suitable for integration into AC power systems with a frequency of 50Hz and a rated working voltage up to 220V, capably making and breaking connections to capacitor loads up to 90kvar to facilitate effective power factor improvement. This single-phase capacitor switching contactor is an improved and refined design manufactured by our facility, building upon the foundation of the original CJ19C (16C) model. To ensure seamless performance and compatibility as a Low voltage power supply reactive power compensation cabinet components, it must be applied under the following standard operational and installation parameters: a) Ambient air temperature should range from a lower limit of -5°C to an upper limit of +40°C, with the average value calculated over a 24-hour period not surpassing +35°C. b) The altitude of the cabinet installation location must not exceed 2000m. c) Humidity conditions within the cabinet environment should be controlled; at an air temperature of +40°C, the relative humidity must not be more than 50%.

Moreover, the monthly average minimum temperature of the wettest month should be no higher than +25°C, and that month's average maximum relative humidity should remain below 90%. d) The component is intended for use in environments classified as pollution degree 3. e) Its installation category is III. f) The contactor must be mounted inside the cabinet in a position that is not subject to significant shaking, impact, or vibration. g) The mounting surface for this product should not be inclined more than 5° from the vertical. The functional principle, critical for cabinet design, is shown in Figure 1. The schematic above the dotted line represents the switching circuit, and below it is the single-phase capacitor bank. The incorporated resistor switching circuit, featuring early-make contacts in series with resistors, activates first upon coil energization. This path allows the capacitors to charge through the current-limiting resistors, thereby damping the switch-on inrush current. Following this, the main contacts close to carry the continuous capacitive current. A significant durability feature of this Low voltage power supply reactive power compensation cabinet components is the automatic disengagement and reset of the resistor circuit after it completes its inrush suppression task. This greatly reduces the chance of resistor burnout during capacitor disconnection, enhancing the overall reliability, safety, and service life of the components within your low-voltage power supply reactive power compensation cabinet.

CJ19C Single-Phase and Three-Phase Y-Type (requires three contactors) Wiring diagram is shown in Figure 2.

The CJ19C (Single-Phase)-43 contactor has two auxiliary contacts, with three combinations.

Auxiliary contact combinations are shown in Table 1. Auxiliary modules can be installed on both sides of the contactor to increase the number of auxiliary contacts.

 

Two types of auxiliary contacts are available:

LA8-DN11 (one normally open and one normally closed)

LA8-DN20 (two normally open); selected by the user when ordering.

External Dimensions and Installation Dimensions

The CJ19C (single-phase)-43 contactor can be installed using M4 screws and lock washers, or using a 35mm mounting rail.

See Figure 3 for the external dimensions and installation dimensions of the CJ19C (single-phase)-43 contactor.