KTSC61K High-Reliability Solid-State Relay (SSR) - 600V/1A AC Load Switching

The KTSC61K is a high-performance solid-state relay (SSR) engineered for reliable AC load switching in industrial, automation, and power control applications. This compact device combines a zero-crossing (ZC) triac output with a photo-isolated input circuit, offering silent operation, long service life, and superior electrical isolation. With a maximum load voltage of 600V AC and current rating of 1A, the KTSC61K is ideal for controlling resistive or slightly inductive loads such as heaters, small motors, lighting systems, and solenoids. Its robust design ensures stable performance in demanding environments.

​Key Technical Specifications​

​Advanced Design Features​

• ​Zero-Crossing Protection: Automatically switches load at AC voltage zero-cross points to minimize inrush current and EMI, extending load and relay lifespan.
• ​High Isolation Performance: 2500V RMS input-output isolation barrier ensures safety and prevents electrical noise interference between control and load circuits.
• ​Compact & Durable: Miniature DIP package (6.0mm×4.0mm) saves PCB space while withstanding harsh industrial environments (vibration, humidity, dust).
• ​Low Power Control: Requires only 3V~32V DC input signal (compatible with PLCs, microcontrollers, and switches) for efficient system integration.
• ​Silent Operation: Solid-state design eliminates mechanical wear and acoustic noise compared to traditional electromechanical relays (EMRs).

​Industrial Applications​

• ​Industrial Automation: HVAC systems, conveyor controls, and process machinery load switching.
• ​Heating Control: Temperature regulation for industrial ovens, water heaters, and zone heating systems.
• ​Lighting Systems: Dimming or on/off control of commercial/industrial LED/magnetic ballast lighting.
• ​Appliances & Equipment: Small motor controls (fans, pumps) and solenoid actuators in white goods or machinery.

​Performance Advantages​

• ​Reliability: No moving parts → 10x longer lifespan than EMRs (up to 10⁹ operations under normal conditions).
• ​Efficiency: Zero-crossing switching reduces power loss and EMI, meeting EMC compliance requirements.
• ​Safety: Reinforced isolation protects control circuits from high-voltage load transients.
• ​Versatility: Supports both DC control signals (3V~32V) and AC loads (up to 600V/1A), adaptable to diverse system designs.

​Design Considerations​

1. ​Load Matching:

   • For inductive loads (e.g., motors, transformers), add an external snubber circuit (RC network) to suppress voltage spikes and protect the triac.
   • Avoid exceeding the 1A continuous current rating; derate for high ambient temperatures (>50°C).

2. ​PCB Layout:

   • Place a heat sink (if needed) on the SSR’s output side to manage thermal dissipation (check power derating curves in datasheet).
   • Keep input and output traces physically separated to maintain isolation integrity.

3. ​Control Signal:

   • Ensure the DC control voltage (3V~32V) provides sufficient current (typically 5~20mA) to activate the internal LED driver.
   • Use a current-limiting resistor if the control source cannot supply adequate drive current.

4. ​Thermal Management:

   • Monitor ambient temperature; performance derates at >85°C (consult datasheet for specific limits).
   • Avoid placing near heat-generating components to prevent overheating.

​Future-Proof Engineering​

• ​Long-Term Availability: Backed by manufacturer’s industrial-grade product longevity commitment.
• ​Compliance: Meets key safety standards including IEC/EN 60950-1 (IT equipment), IEC 60730 (appliance safety), and UL/cUL recognition (pending verification).
• ​Scalability: Compatible with standard SSR sockets and control interfaces, enabling easy upgrades in existing designs.
• ​Support: Detailed datasheets, application notes, and technical support available for integration guidance.

Tags: AC Load Control, Industrial Automation, Zero-Crossing Switching, High-Isolation SSR, Compact Relay, Silent Operation