SRLR-DA1H,AA1H,DD1H SSR series uses semiconductor switching elements to replace the non-contact on-off electronic switch of the original mechanical switch. Two of the small terminals are input control terminals, The other two bigger terminals are output controlled terminal. Photo coupler isolation or magnetic isolation is 

used between input and output. To add a DC or AC control signal to the input, and the output can change from off state to on state (blocking state when there is no signal), so as to control a large load The whole device has no moving parts and contacts, it can get the same functions as common mechanical electromagnetic relays. The 

series of products integrate the heat sink and the switch together, and din rails are installed at the bottom of the product, which is very convenient for users to install and use. They are widely used in automatic control fields such as electric furnace heating constant temperature system, numerical control machinery, plastic machinery, 

food machinery, packaging machinery, textile machinery, petrochemical equipment, entertainment facilities etc. 

suitable for various resistive, inductive and capacitive loads.