KS1-40DA 40A Single Phase Solid State Relay – 3-32V DC Input, 24-380V AC Output

The KS1-40DA is a 40A single-phase solid state relay designed for reliable DC-to-AC switching in industrial and automation applications. It accepts a control voltage of 3-32V DC and can switch loads up to 40A at 24-380V AC, making it suitable for motor control, CNC machines, and general switching circuits. The KS1-40DA relay module uses zero-cross switching, which helps reduce electrical noise and inrush current during operation. Because it has no moving mechanical parts, it provides silent, wear-free switching and a long service life exceeding one million operations. An integrated LED indicator shows the relay’s operating status, and the panel-mount design with dimensions of 32 × 44 × 57 mm allows for straightforward installation in control panels. This 40A solid state relay is a practical replacement for AC contactors in environments where frequent switching, corrosion resistance, or dust protection are required.

1. Motor starting and movement control.
2. CNC machines and automated equipment.
3. Switching circuits and general load control.
4. Industrial automation systems requiring frequent, silent switching.
5. Environments with corrosion, moisture, or dust exposure.

1. Model: KS1-40DA.
2. Control method: zero-crossing.
3. Control voltage: 3-32V DC.
4. Load / output voltage: 24-380V AC.
5. Output current: 40A.
6. Coil power: 3W.
7. Number of poles: 4-pole.
8. Turn-off time: less than 10 ms.
9. Service life: greater than 1,000,000 operations.
10. Indicator: LED.
11. Dimensions (L × W × H): 32 × 44 × 57 mm.

1. Solid state construction with no moving contacts for silent, wear-free operation.
2. Zero-cross switching reduces electrical noise and inrush current.
3. Wide control voltage range (3-32V DC) compatible with logic-level controllers.
4. High load current capacity (40A) for demanding AC applications.
5. Integrated LED indicator for operating status.
6. Panel-mount design for straightforward installation.
7. Long service life exceeding one million operations.