SSR SOLID STATE RELAY 1 CHANNEL
DC+:Connect power positive
CH:Relay module signal trigger end(Low level trigger is effective)
Wiring: When the triggered by low voltage, current will get through
A solid state relay (SSR) is an IC that acts like a mechanical relay.
SSR consist of a sensor which responds to an appropriate input (control signal), a solid-
power to the load circuitry, and a coupling mechanism to enable the control signal to activate this switch without any mechanical parts.
The main parts of a standard SSR is:
A SSR is based on a single MOSFET, or multiple MOSFETs in a paralleled array. It has an inherent substrate diode that conducts in the reverse direction, so a single MOSFET cannot block current in both directions. For AC (bi-
Solid state relays, have several advantages over mechanical relays:
1.) SSR can be switched by a much lower voltage and at a much lower current than most mechanical relays.
For example, the above SSR module can be driven only by 5mA current, while most the mechanical relay would need a minimum drive current 100mA;
2.) Much faster switch speed; the minimum switch time of SSR can be up to 1ms; while most the mechanical relay needs 10 ms at least;
3.) As the SSR do not have any moving parts, it would be more stable in hard environments and have a longer lifetime;
4.) Totally silent operation, no Relay chatter noise in the switching anymore;
SSR works as follow picture. When there is no signal in the input, the output terminal disconnected;
when the input signal be active, the 2 outputs of the SSR connected so the whole load circuit connected: