Low Voltage Capacitor Switching Switch

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The KS/FK capacitor switching switch employs a parallel configuration of thyristor switches and magnetic‑hold switches, combining the zero‑crossing switching advantages of thyristors during turn‑on and turn‑off with the zero‑power‑consumption benefits of magnetic‑hold switches during normal operation.

key word:

Low-voltage component

Hotline:

400-0571-505

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Detailed introduction

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Product Overview

The KS/FK capacitor switching switch parallels a high‑voltage, high‑current thyristor with the contacts of a magnetic latching relay. Controlled by a microcomputer, it automatically identifies the optimal switching-in and switching-out points, enabling zero‑voltage switching-in and zero‑current switching-out. The switching operations are executed instantaneously by the thyristor, while normal current conduction is maintained by the magnetic latching relay, whose contacts are engaged via pulse‑triggered voltage.

The KS/FK capacitor switching switch boasts significant advantages such as impact-free operation, low power consumption, and long service life, making it a viable alternative to contactors or thyristor switches. It is widely employed in low-voltage reactive power compensation applications.

Product model

Main Technical Parameters

● Rated voltage, power supply, and rated current: Rated operating voltage: 380 V (common compensation) / 220 V (individual compensation), three-phase four-wire AC.

● 50 Hz; Permissible deviation: the three-phase voltages shall not vary synchronously by more than ±20%; waveform shall be sinusoidal, with total harmonic distortion less than 5%; rated frequency: 50 Hz ± 5%.

● Rated current: 30/45/63/80/100 A;

● Service life: 500,000 cycles

● Number of phases: Three-phase (Δ connection); Single-phase (Y connection);

● Control Capacity: Three-phase common-compensation capacitor bank capacity: 10/20/25/30/40/50 kVAr; Total capacity of phase‑split three-phase capacitor banks: 10/20/25/30 kVAr.

● Response time: ≤60 ms.

● Altitude shall not exceed 2,000 meters (corrections shall be applied for altitudes above 2,000 meters in accordance with the relevant standards).
● Ambient temperature: -40~+50°C
● The installation location shall be free from severe mechanical vibrations, harmful gases and vapors, and conductive or explosive dust.
● Continuous operating voltage: 1.0Un; the maximum long-term overvoltage shall not exceed 1.1Un.
● Steady-state overcurrent (including harmonic currents) shall not exceed 1.5In.

Main Wiring Diagram

Model number	Rated Current / A	Controllable capacitor capacity /kvar (380/400V)	Dimensions/mm
KS/FK -0.48- 10G	30	10	Appearance: 186 x 116.4 Installation: 171 x 101.3
KS/FK -0.48- 20G	45	20
KS/FK -0.48- 25G	63	25
KS/FK -0.48- 30G	63	30
KS/FK -0.48- 40G	80	40
KS/FK -0.48- 50G	100	50
KS/FK -0.28- 10F	63	10
KS/FK -0.28- 15F	63	15
KS/FK -0.28- 25F	80	25
KS/FK -0.28- 30F	100	30

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