Small intermediate relay: easy to install, quality assurance, selected materials, durable, coil made of pure copper wire, quick response, strong suction.When there is no input to the control power, the coil does not work, the normally open contacts are off, and the normally closed contacts are on.When there is input to the control power, the coil is energized, the normally closed contacts are off, and the normally open contacts are on.1. Selected materials: made of high-quality plastic, impact-resistant, oxidation-resistant, long service life.2. Copper parts with silver points: reliable quality, good conductivity, durable.3. Thickened materials: longer lifespan, robust materials.