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BYKCS Series Thyristor Switch 380V Non-Contact Thyristor Switch 12V DC Common Causative Type
Model meaning
Main Specification of BYKCS Series Thyristor Switch
| Type | BYKCS |
| Rated Operation Voltage | 380V,50Hz |
| Useful Lifespan | Beyond 1 million times |
| Response Time of Switch Action | Not exceed 20ms |
| Time Interval Between Reclosing After Opening The Switch | Not exceed 200ms |
| Switching Withstand Voltage | ≥2000V |
| Control Voltage | 5~24VDC |
| Input Current | Not exceed 10mA |
| Control Capacity | A Type: 1-40Kvar B Type: 40-60Kvar |
| Temperature | -25℃~+55℃ |
| Rated Moisture | The maximum relative temperature is 90%(at 25℃) |
| Attitude | Not exceed 2000m |
| Enviromental | There are no explosive or flammable hazardous medium, no corrosive gas to metals, and no conductive dust that damages electrical insulation and the presence of severe mold. |
| Installation site | No obvious superharmonic components exist. |
Overview of BYKCS Series Thyristor Switch
The BYKCS Series Thyristor Switch Module represents a quantum leap in reactive power compensation for LV (Low Voltage) electrical systems. Engineered as a hybrid composite switch, it merges the lightning-fast response of thyristor AC switch technology with electromechanical reliability to deliver sub-20ms capacitor switching – outperforming legacy solutions like ABB Thyristor Switching Modules and Epcos Thyristor Switch Modules. Designed for 380V three-phase electric networks, this non-contact thyristor switch leverages zero-crossing detection to eliminate arcing during capacitor engagement/disengagement, reducing harmonic distortion (THDi <4%) and inrush currents (<3× rated). By dynamically correcting power factor fluctuations and neutralizing three-phase imbalances (±5% phase deviation), it actively elevates power quality in demanding environments such as grid power stations, manufacturing plants, and data centers. Unlike traditional GTO thyristors, its silicon-carbide-reinforced fast-switching thyristor core (triggered by 12V DC) achieves 1 million+ operations with near-zero conduction loss (<0.5W/phase), slashing energy waste by 15% while preventing utility penalties.
This low-voltage composite thyristor switch excels in improving power quality metrics critical for sensitive low-voltage electrical systems. Its patented hybrid architecture employs a solid-state thyristor for transient switching and a magnetic latching relay for steady-state conduction – a synergy that reduces failure rates by 40% versus conventional composite switches. The module actively suppresses voltage sags/swells by >70% and filters high-frequency noise (2–150 kHz), protecting downstream power quality devices like PLCs, VFDs, and metering systems from damage. Thermally optimized with passive cooling (no heatsinks required), it operates reliably in ambient temperatures up to 60°C, ideal for congested switchgear or coastal installations where salt corrosion degrades electromechanical contacts. Integrated dv/dt snubbers and overvoltage clamps shield capacitor banks from switching transients, extending their lifespan 3x while maintaining IEEE 519-compliant power quality. For 3-phase power networks with volatile inductive loads (e.g., motors, crushers, welders), the BYKCS enables adaptive reactive power compensation via Modbus/RS-485 integration, allowing real-time adjustments aligned with load fluctuations.
Deploying the BYKCS Series translates to quantifiable operational gains: 90% reduction in neutral currents from phase imbalances, 60% lower maintenance costs versus contactor-based systems, and 8–12% decreased line losses. Its 12V DC common causative design simplifies wiring with third-party controllers, while auto-bypass functionality ensures uninterrupted operations during faults – critical for mission-critical infrastructure like semiconductor fabs or hospital backup systems. As industries increasingly prioritize low-voltage power stability amid rising renewable integration, this thyristor module delivers future-proof resilience. Choose BYKCS to transform your grid power station or industrial facility into a model of energy efficiency and uncompromised power quality.
Technical Functions of BYKCS Series Thyristor Switch
Real-time reactive power compensation and voltage stabilization
The BYKCS series thyristor switch enables ultra-fast contactless switching (driven by 12V DC) for precise reactive power compensation in low voltage grids (380V). It dynamically corrects lagging/leading power factor by switching capacitor banks within 20 milliseconds, thus avoiding fines from electricity suppliers. This low voltage composite thyristor switch suppresses voltage sags/swells by more than 70%, thus maintaining grid stability and protecting sensitive equipment from power quality disturbances such as flicker or undervoltage events commonly caused by inductive loads in manufacturing.
Harmonic suppression and power quality improvement
Using hybrid thyristor-transistor technology, BYKCS is a composite switch that minimizes harmonic distortion (THDi < 4%) during capacitor switching. Its zero-crossing triggering eliminates inrush current (a major source of transient harmonics), ensuring compliance with standards. This thyristor-based solution reduces voltage distortion by filtering high-frequency noise, which is critical for protecting PLCs, VFDs, and metering systems in facilities with non-linear loads (e.g., data centers, EV chargers).
Non-contact switch, longer service life
Unlike electromechanical relays, this non-contact thyristor switch uses solid-state semiconductor control (12V DC trigger) to achieve over 1 million switching cycles, 10 times longer than conventional contactors. Arc-free operation eliminates contact welding or corrosion, reducing maintenance costs by 60%. It is ideal for harsh environments (dusty, wet), providing reliable low-voltage switching in environments such as mining, chemical plants or coastal facilities where corrosion can degrade mechanical contacts.
Three-phase unbalance correction
BYKCS uses independent control per phase to correct three-phase imbalance (adjusting ±5% phase deviation). By dynamically compensating for unequal reactive loads on each phase, the neutral current can be reduced by up to 90%, preventing transformer overheating and voltage asymmetry. This composite thyristor switch is essential for facilities with single-phase heavy equipment (e.g., furnaces, CNC machine tools), improving power quality while reducing power losses by 8-15%.
Energy efficiency and equipment protection
Energy efficiency is optimized with near-zero power dissipation during on-time (<0.5W per phase). Low voltage thyristor switches generate very little heat (thanks to the silicon carbide semiconductor layer) and can be passively cooled without a heat sink. Integrated dv/dt and overvoltage snubbers protect capacitors from turn-on surges, extending capacitor service life by 3 times. Supports star/delta configurations for flexible reactive power compensation in 380V grids.
Intelligent control integration and diagnosis
Seamless integration with power quality analyzers and SCADA via Modbus RTU/RS-485. Real-time monitoring of parameters such as switching cycles, temperature and phase current enables predictive maintenance. 12V DC common factor design simplifies wiring to PLC or capacitor controller. Fault automatic bypass function ensures uninterrupted operation - this is critical in hospitals, semiconductor factories or tunnel safety systems (e.g. ventilation, lighting), where the reliability of low voltage switches prevents downtime.
The Working Steps of BYKCS Series Thyristor Switch
Start-up and zero voltage detection (capacitor engagement)
When receiving a 12V DC trigger signal from the reactive power compensation controller, the switch activates its voltage zero-crossing detection circuit. This circuit monitors the AC waveform in real time and determines the optimal zero voltage point (within 1-3 electrical degrees) for the capacitor bank to engage. During this phase, the thyristor modules (rated for 380V low-voltage systems) are instantaneously pre-charged to eliminate potential inrush currents (surge suppression) that could damage the capacitors or disturb the power quality.
Thyristor based switching and relay bypass (seamless switching)
At the zero voltage instant detected, the thyristors (SiC enhanced with high dV/dt immunity) conduct current to the capacitor bank, enabling arc-free switching. Within 10-15 milliseconds, the magnetic latching relay (connected in parallel) closes its contacts under thyristor protection, creating a low resistance path. Once stabilized, the thyristors automatically open, redirecting the full load current to the relay. This eliminates continuous conduction losses (<0.5W/phase) and prevents thermal stress, eliminating the need for external heat sinks or cooling fans.
Continuous conduction through magnetic relays (low power operation)
During steady-state operation, the magnetic latching relay maintains the circuit connection with near-zero power consumption. Its non-contact latching mechanism (energized only during a change of state) maintains reactive current to the capacitor without coil energization, reducing operating power consumption to less than 3W. This phase ensures lossless conduction for long-term capacitor compensation, improving grid voltage stability and energy efficiency.
Zero current disconnection (capacitor safety disconnection)
When the controller issues a disconnect signal, the thyristor restarts, paralleling the relay. The relay contacts open at zero voltage (to prevent arcing or contact welding), while the thyristor carries the transient current. At the next current zero crossing, the thyristor stops conducting, achieving a true zero current interruption. This suppresses transient overvoltages (less than 1.5 times the system voltage) and isolates the capacitor bank without generating voltage spikes or harmonics, thereby maintaining the integrity of the circuit protection and the service life of the capacitors.
Intelligent control integration and diagnosis
Seamless integration with power quality analyzers and SCADA via Modbus RTU/RS-485. Real-time monitoring of parameters such as switching cycles, temperature and phase current enables predictive maintenance. 12V DC common factor design simplifies wiring to PLC or capacitor controller. Fault automatic bypass function ensures uninterrupted operation - this is critical in hospitals, semiconductor factories or tunnel safety systems (e.g. ventilation, lighting), where the reliability of low voltage switches prevents downtime.
Wiring Instructions forBYKCS Series Thyristor Switch
The BYKCS series thyristor switch adopts standardized industrial design, with a concise and efficient wiring method to ensure safety and stability. The main power terminals (L1/L2/L3) should be connected to the three-phase power supply (450V AC) and the neutral line (N), and be reliably connected to the system grounding grid through the grounding terminal (PE) to eliminate electrical interference and leakage risks.The control signal interface (IN+/IN-) supports 0 - 10V analog signals or PWM pulse inputs. It should be connected to the external controller with shielded twisted-pair wires, and ensure that the opto-isolation circuit effectively blocks the common-mode voltage to prevent voltage fluctuations from impacting the control end.When wiring the trigger circuit, the drive signal wire should be connected to the trigger signal port (TRIG), and the phase and amplitude of the external trigger source should be synchronously matched to ensure the precise conduction of the thyristor module.For the protection circuit, an overvoltage protection module (OVP) and an overcurrent protection sensor (OCP) need to be externally connected to monitor the line status in real time and automatically cut off abnormal currents.When installing the heat dissipation device, heat dissipation space should be reserved. The power supply of the heat dissipation fan should be connected to an independent circuit (12/24V DC), and ensure that the air duct is interlocked with the temperature sensor to maintain the operating temperature below 85°C.After wiring is completed, an insulation tester should be used to verify the electrical isolation performance to avoid equipment failures caused by wiring errors.
Product-related size information
Quality is reflected in the details
Hybrid architecture: combining solid-state speed with electromechanical reliability
The BYKCS series features a revolutionary hybrid compound design that combines the response speed of solid-state thyristor AC switches with the electromechanical durability – a breakthrough that goes beyond conventional ABB or Epcos thyristor switch modules. At its core are silicon carbide enhanced fast-switching thyristors (rated for 380V LV systems) that handle ultra-fast transitions (<20ms) during capacitor bank on/off. This enables precise zero-crossing switching, eliminating arcing and inrush currents (<3x rated) that degrade capacitor performance and distort power quality in three-phase grids5. Unlike pure GTO thyristors, which have high conduction losses and limited life, BYKCS uses a magnetic latching relay to handle steady-state currents. The relay is activated only during state changes, reducing coil excitation energy to <3W while maintaining >1 million operations – 10 times the life of conventional contactors. Thyristor-relay switching times are completed in less than 15 milliseconds, ensuring arc-free commutation, which significantly reduces harmonic distortion (THDi <4%) and prevents voltage sags/swells exceeding 70% . This architecture is critical for reactive power compensation in fluctuating environments such as grid-connected power stations or manufacturing plants, where rapid load fluctuations require sub-cycle correction to avoid utility fines and equipment damage. By separating high-frequency switching (thyristors) from continuous conduction (relays), BYKCS has a 40% lower failure rate than standard compound switches, making it the optimal low-voltage switch for critical power quality equipment.
Military-grade materials: extremely durable in harsh electrical environments
Precision-manufactured from aerospace-grade materials, BYKCS thyristor switch modules offer unrivalled toughness in corrosive, high-voltage and low-voltage electrical systems. Its thyristor substrates use silicon carbide (SiC) semiconductors, which outperform conventional silicon, withstanding junction temperatures of 200°C and a five-fold improvement in thermal conductivity. This eliminates the need for a heat sink to maintain an ambient temperature of 60°C, making it ideal for crowded switchgear or coastal areas where salt corrosion can degrade copper contacts. The module’s insulation system uses a Class B (rated to 130°C) polyimide polymer film that is 50% thinner than standard PVC film but has a three-fold improvement in dielectric constant. This prevents phase-to-phase leakage on the 380V three-phase power bus, even under 10kV/µs transient spikes – critical to avoiding short circuits in grid-connected power stations with high fault currents46. Crucially, the current-carrying elements are routed with oxygen-free copper (OFC) and electrolessly nickel-plated, which reduces resistive losses by 18% compared to brass or phosphor bronze. BYKCS, paired with Kemet T491 military-grade tantalum capacitors (proven for 20-year life), maintains stable capacitance over a temperature range of -40°C to 125°C, filtering out high-frequency noise (2-150 kHz) that interferes with PLCs and VFDs 67. Together, these materials ensure IEEE 519-compliant power quality with near-zero drift (±0.5% over 10,000 cycles), outperforming epoxy-sealed Epcos thyristor switch modules by 30% in humidity/temperature cycle testing.
Zero-gap cooling and compact topology: Maximizing power density in space-constrained installations
BYKCS redefines power density in low voltage switchgear with a patented zero-gap cooling topology and 3D stacked PCB architecture. Its transformer features a parallel-wound 2x matrix core with staggered copper foil, which reduces AC winding losses by 22% and profile height by 60% compared to conventional designs. This enables it to be integrated directly into a 380V three-phase switchboard without auxiliary bays, saving 50% of cabinet volume. For heat dissipation, a vapor chamber embedded below the eGaN FETs (such as the EPC2053 equivalent) dissipates a heat flux of 15W/cm² without the need for a fan. By eliminating the reliance on airflow, the switch operates at 94% efficiency at 900W load while maintaining a hotspot temperature of <75°C in a sealed enclosure. The layout further optimizes EMI immunity with NEC Proadlizer decoupling capacitors (1200μF, ESR<0.8mΩ). These devices suppress switching transients to less than 1.5 times the system voltage, which is critical for protecting adjacent power quality equipment such as meters or sensors. Combined with gold-plated Bourns contact brushes (rated for 500,000 friction cycles), the module ensures signal integrity during continuous reactive power compensation, reducing contact resistance drift by 90% compared to carbon brushes . With a power density of 1500W/in³, the BYKCS is 3.2 times more compact than ABB thyristor switch modules while delivering 98.3% efficiency over a 48-60V input range, making it ideal for retrofitting aging three-phase power infrastructure where space/energy savings are critical.
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Baoyu Holding Co., Ltd
Baoyu Holding Co., Ltd. was founded in 2015 and is located in Wenzhou City, Zhejiang Province. The location is excellent and the transportation is convenient. We have very rich industry experience and is a trusted supplier. The company has advanced production equipment and skilled front-line employees. Our company is mainly engaged in the production and sales of power quality products，such as active power filters, static var generators, intelligent capacitors, power capacitors, reactive power compensators, composite switches, capacitor contactors, thyristor switches, reactors. Our company knows that the development of the company depends on the innovation and quality of the products. Therefore, our products have strict quality control from the procurement of raw materials to the sale of finished products. The company has established a quality management system that meets the requirements of the international quality management system. The company continuously releases the original innovations according to the market and customer needs, and always maintains the novelty and innovation of the products. The company wants the customer's thoughts and urgency. Solving problems for customers and meeting customer needs is our eternal pursuit! Our company's products are sold worldwide. The company has won the unanimous recognition of consumers with satisfactory product quality and perfect after-sales service. We have a professional R & D team. We can accept O E M and O D M.We sincerely welcome friends from all over the world to visit our company and cooperate with us on the basis of long-term mutual benefits. We are looking forward to receiving your enquiry soon.
Our storage facility utilizes precision climate control, automated 3D warehousing (which increases capacity by 200%), and integrated safety systems (including fire suppression, anti-static protocols, and monthly audits) to maintain zero oxidation and ensure product integrity. In addition, our cleanroom manufacturing facility features a combination of natural and LED lighting, optimized workflows, and cross-trained technicians to enhance efficiency. Automated quality control systems and ISO-certified processes ensure compliance with dimensional and electrical standards, while AI-driven analytics and stringent protocols help achieve near-zero defects. By integrating advanced automation, tailored solutions, and steadfast reliability, Baoyu provides durable, mission-critical power systems, reinforcing our status as the preferred global partner for industries that require precision and innovation.
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