Optical Solid State Relay is a relay that operates by utilizing the photoelectric effect. It is composed of light-emitting elements and photosensitive devices. When the signal added to the light-emitting element reaches a certain value, the action of light makes the resistance of the photosensitive device change dramatically, thus playing a role in closing or opening the circuit.
| Product | Photo | Package | size(LxWxHmm) | Load Voltage (V) | Load Current (mA) | RON(typ) | IFon (Max) (mA) | Topr (Min) (degC) | Topr (Max) (degC) | Viso (Vrms) | File |
| KL860A |  |
DIP8 | 9.75x6.6x3.5 | 600 | 50 | 70 | 5 | -40 | 85 | 5000 |  |
| KL606A3 |  |
DIP6 | 7.1x6.48x3.5 | 600.0 | 2500 | 0.2 | 3 | -40 | 85 | 5000 | |
| KL840A |  |
DIP8 | 9.75x6.6x3.5 | 400 | 120 | 30.0 | 5 | -40 | 85 | 5000 | |
| KL660A |  |
DIP6 | 7.1x6.48x3.5 | 600.0 | 50 | 70.0 | 3 | -40 | 85 | 5000 | |
| KL625A |  |
DIP6 | 7.1x6.48x3.5 | 250.0 | 150 | 15.0 | 3.0 | -40 | 85 | 5000 | |
| KL640A |  |
DIP6 | 7.1x6.48x3.5 | 400.0 | 120 | 30.0 | 3.0 | -40 | 85 | 5000 | |
| KL606A |  |
DIP6 | 7.1x6.48x3.5 | 60.0 | 550 | 2.5 | 3 | -40 | 85 | 5000 | |
| KL460A |  |
DIP4 | 6.5x4.59x3.5 | 600.0 | 50 | 70.0 | 5 | -40 | 85 | 5000 | |
| KL440A |  |
DIP4 | 6.5x4.59x3.5 | 400.0 | 120 | 30.0 | 5 | -40 | 85 | 5000 | |
