KSD240D3-L SSR 4-15VDC Input 240VAC 3A Zero Cross Solid State Relay

The KSD240D3-L (037) Solid State Relay (SSR) is a high-performance AC switching device designed for efficient, reliable, and silent control of AC loads in industrial automation and electrical systems. Using advanced solid-state semiconductor technology, it eliminates mechanical wear and provides long operational life, fast switching, and maintenance-free performance.

This relay operates with a wide control input range of 4VDC to 15VDC, making it compatible with a broad range of control systems including PLC outputs, microcontrollers, and industrial control circuits. With a maximum input current of 25mA, it ensures low-power and efficient triggering while maintaining stable operation across varying input conditions.

On the output side, the KSD240D3-L supports AC load switching in the range of 48VAC to 280VAC, with a nominal 240VAC class rating. It is capable of handling a continuous load current of 0.1A to 3A, making it suitable for a wide variety of medium-power AC switching applications.

This model features zero-cross switching technology, meaning it only turns ON when the AC waveform crosses zero voltage. This reduces electrical noise, minimizes inrush current, and significantly extends the lifespan of connected loads such as heaters, motors, and transformers.

For safety and reliability, the relay includes strong transient overvoltage protection rated at 600V peak and an input-to-output dielectric strength of at least 4000Vrms. These protections ensure stable operation in electrically noisy and demanding industrial environments.

The KSD240D3-L also offers fast and precise switching performance with a maximum turn-on and turn-off time of 1/2 AC cycle plus 1ms. Its solid-state design ensures silent operation, no arcing, and no mechanical wear, making it ideal for applications requiring frequent switching cycles or long-term continuous operation.

Features

• Solid State Relay (SSR) for AC load control
• 4-15VDC wide control input range
• 240VAC class output switching (48-280VAC range)
• 3A maximum load current
• Zero-cross switching for reduced electrical noise
• High surge current capability up to 120A (10ms)
• Transient overvoltage protection up to 600V peak
• High dielectric strength 4000Vrms (input/output isolation)
• Fast response switching ( AC cycle + 1ms)
• Silent operation with no mechanical wear
• Long service life and high reliability
• Low input current for easy control integration

Specifications

• Model: KSD240D3-L (037)
• Device Type: Solid State Relay (SSR)
• Control Voltage: 4-15VDC
• Maximum Input Current: 25mA
• Minimum Turn-On Voltage: 4VDC
• Minimum Turn-Off Voltage: 1VDC
• Load Voltage Range: 48-280VAC
• Nominal Load Voltage: 240VAC class
• Output Type: Zero-Cross Switching
• Load Current Range: 0.1-3A
• Maximum Surge Current (10ms): 120A
• Transient Overvoltage: 600V peak
• Turn-On Time: 1/2 AC cycle + 1ms
• Turn-Off Time: 1/2 AC cycle + 1ms
• Dielectric Strength: 4000Vrms (Input to Output)

Applications

• Industrial automation systems
• Heating element control systems
• Motor and fan control (light/medium duty)
• PLC output switching
• Lighting control systems
• HVAC control systems
• Process control equipment
• Packaging and production machinery
• Home and building automation
• General-purpose AC switching applications

What's in the box
1 x KSD240D3-L SSR 4-15VDC Input 240VAC 3A Zero Cross Solid State Relay