No contact, no noise, internal working , no spark noise generation Good optocoupler operation for more stable power cycle capability and excellent temperature characteristics The shell is made of transparent high-temperature flame-retardant material, which is glossy, heat-resistant, fire-resistant, and dustproof, sturdy and . Solid state relays do not have mechanical components and are operated by thyristors to complete contact work Electroplated aluminum plate has excellent heat dissipation<br><br>Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:Black Material:ABS type:25A<br><br>Package Contents: 1 x Solid State Relay<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.