Solid State Relays (SSRs) :- It is an electronic switching device that switches on or off when a small external voltage is applied across its control terminals.

What is a Solid-State Relay?
A Solid-State Relay (SSR) is an electronic component that switches Power (AC or DC current) to a load circuit and provides electrical isolation between an application's control circuit and load circuit. It is a competitive technology to Electromechanical Relays (EMRs) and other switching technologies such as Mercury Displacement Relays (MDRs).

Why Use Solid State Switching Technology?
Long Life: Solid state relays have no moving parts. Therefore, there is no mechanical wear and tear on the output contact, ideal for repetitive applications.

Quiet Operation: Solid state switching solutions make no acoustical noise when the output contacts change state. This is highly desirable in many commercial and medical applications.

Minimum Electrical Noise: Zero voltage turn-on and zero current turn-off allows for minimum electrical disturbances generated by solid state relays and contactors.

Low Power Consumption: Solid state relays require very little input power "coil current" to switch large loads.

Shock & Vibration Resistant: Solid state switching solutions are not susceptible to erratic or unreliable operation when operating under tough environments.

Ideal for Harsh Environments: Solid state relays do not generate sparks or electric arcs and do not bounce either electrically or mechanically

High Compatibility with Control Systems: DC controlled SSRs can be switched by digital systems such as µC based systems. AC controlled SSRs can be driven by limit switches and sensors carrying AC control signals.

Reduced Weight: Solid state relays are much lighter than equivalent electromechanical versions; depending on the power can be up to 70%.

Position Insensitive: Suitable for mounting in either vertical or horizontal position, "dead bug" position and adjacent mounting.

Fast Switching: Instantaneous turn-on solid state relays and contactors respond to a control signal in less than 100 µs.

Magnetic Noise Immunity: Magnetic fields have little effect on solid state relays and contactors since, unlike electromechanical contactors, they don't use a magnetic coil to switch the load.

Reduced Energy Cost: Energy savings are achieved from switching the load off when it is not required, using automation to ensure maximum system efficiency.


  • Heating Control: Applications include professional food equipment, plastic moulding/extrusion machinery, HVAC&R and soldering equipment.
  • Motion Control: Includes conveyor systems, solar trackers, fans, solenoid, valve control, elevators, lifts, hoists, and exercise equipment.
  • Power Control: Includes power supplies, transformers, regulators, inverters, converters, UPS systems, etc. as well as any load that is not specifically for heating, lighting or motion control.
  • Lighting Control: These applications are usually broken down into three categories: theatrical, warehouse and commercial. Many of the products used in this segment are custom designed.

SSR Types:
1) DC to AC,
2) AC to AC,
3) DC to DC

Standard Products:
1) Panel Mount SSR.
2) DIN Rail Mount SSR.
3) PCB Mount SSR.
4) SSR Timers.
5) SSR Accessories
6) SSR Heatsink.
7) Control Relays.
8) Power Modules

Basic types of SSR as per Mounting:

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