No contact, no noise, internal working method, no spark noise generation Solid state relays do not have mechanical components and are operated by thyristors to complete contact work The shell is made of transparent high-temperature flame-retardant material, which is glossy, heat-, fire-, and dustproof, sturdy and . Good optocoupler operation for more stable power cycle capability and excellent temperature characteristics Electroplated aluminum plate has excellent heat dissipation, Weight: 0.23699693165 pounds, Manufacturer: tiyao