What is a Solid-state relay?
A solid state relay is an electronic switching device that switches on or off when an external voltage is applied across its control terminals. It serves the same function as an electromechanical relay but has no moving parts, resulting in a longer operational lifetime.
BCH Electric Ltd. is one of the leading manufacturers and suppliers of solid-state relays in India. Our solid-state relay is reliable and more durable than others. As we manufacture our products by using high-quality and material that satisfies our customer's needs. BCH Solid State Relay is ideal for an application that requires high switching frequency and can be used in harsh environments like shock, vibration, and dusty environments.
BCH Solid State Relay is widely used in heating control, Motor control, capacitor switching and lighting control, solenoid, transformer control, and air conditioning applications.
Specification and Features Solid State Relay
- Range 12A to 125A
- Single-phase and three phases SSRs
- Slim SSR range (22.5mm) with current monitoring & temperature controller PID
- Input Voltage 3 to 32VDC, Other voltages on request
- High switching frequency and longer life
- Reliable and quite an operation
- Compact size
- Low-level output control is possible without interfacing
Solid State Relay Working -
The working of the solid state relay can be understood by categorizing the solid-state relays into two categories. One is the AC solid state relay, and the other is the DC solid state relay. It consists of one input and output terminal. The inputs and the output of the relay are attached to the specified terminals. When a specific control signal is provided to the input terminals of the solid-state relay, the ON and OFF function on the output terminal is performed accordingly. After attaining that function, the switching function of the relay is turned ON. Then, with the help of the coupling circuit in the solid-state relay, a channel is formed between the input and output of the relay.
This coupling circuit also performs the cutoff function in case of unwanted or uncertain situations, set initially before installing the relay. Optical couplers are used in the coupling circuit of the solid-state relay. The optical couplers have good sensitivity, higher response speed, higher input and output insulation levels. The load used in the solid-state relay is a LED used to match the level of the input signal. The output is either “0” or “1” in the solid-state relay. The output of the solid-state relay is connected with a computer for interfacing.
In the case of the DC solid state relay, there is no snubber circuit and zero-crossing control circuit. Instead, a transistor with a larger value is used for the switching of the solid-state relay. Another working principle for this relay is the same as the above working principle.
Applications of Solid State Relays
The most common application of the solid state relay is the load switching of AC load. A number of household circuits have solid state relay for AC load switching. Solid state relays have different applications with the power control, moreover, different solid state relay are used for heater controls.
- Furnaces (e.g., Baking furnaces)
- Machine tools
- Molding machines
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