"24V DC Cooling Fan" x relay input signal is continuously increased from zero to reach the armature start smoking timely action value xx, output signal relay immediately jumps from y = 0 to y = ym, normally open contacts from breaking conduction . Once the contact is closed, input x continues to increase, the output signal y change will no longer play. When the input is greater than xx x from a few accessories. "24V DC Cooling Fan" thermal reed relay coil not energized, and the magnetic force generated by the permanent magnetic drive switch. Can Hang ring to provide a magnetic reed switch is determined by the temperature characteristics of the temperature-sensitive magnetic ring. Solid State Relay (SSR) works and features solid state relay is a two terminals for input and the other two terminals of the output of the four-terminal device, the middle with isolation devices to achieve electrical isolation of input and output. "24V DC Cooling Fan" solid state relays can be divided according to the type of load power supply AC type and DC type. Press the switch types can be divided into normally open and normally closed. Isolation can be divided according to type of hybrid, transformer isolated and optical isolation, optical isolation to a maximum.