Affordable -200 DC Contactor - Agent

SSR uses photosensitive MOSFET devices with LEDs to drive the device.Solid state relay (SSR): Light from the packaged LED activates the photosensitive MOSFET and allows current to flow through it.There will still be significant differences between 200 DC contactors and solid-state relays.

SSR is a faster alternative to electromechanical relays, as their switching time depends on the time required to turn on and off the LED - approximately 1 ms and 0.5 ms, respectively. Due to the absence of mechanical components, their expected lifespan is longer than that of electromechanical or reed relays.

These are typically used in applications where relays must switch back to a safe state in the event of a power outage. The latch relay uses permanent magnets to keep the armature in its current position, even when driven by current from the coil. For very low voltage applications, lockout relays are used because the lack of coil heating may affect the measured thermoelectric potential (EMF).

SSR is very useful for high-voltage applications because LED drivers do provide an electrical isolation barrier between the control circuit and MOSFET. However, due to the switching operation of MOSFET, there is no electrical isolation layer between its contacts. When there is no gate driver on the MOSFET, the drain source channel on the MOSFET has a high resistance, providing a disconnect between the contacts.

There are two types of electromechanical relays: latch type and non latch type. Non self locking relays require continuous current to flow through the coil to maintain relay operation.

Because the connection is made through transistors rather than physical metals in electromechanical and reed relays, the contact resistance of SSRs is higher. Although technological advancements continue to improve the contact resistance of SSRs, it is still common to find resistance of 100 Ohm or higher in production today.

SSR is not as powerful as electromechanical relays. Similar to reed relays, they are highly susceptible to surge currents and damage when used at signal levels higher than their rated values. Although there are no metal contacts that need to be soldered, MOSFET damage can render the relay unusable SSR is common in matrices and multiplexers.