The opto-isolator isolates the input from the output. One of the main components of a solid state relay (SSR) is an opto-isolator (also called an optocoupler) which contains one (or more) infra-red light-emitting diode, or LED light source, and a photo sensitive device within a single case. This makes them ideal for microcontroller, PIC and Arduino interfacing as a low-current, 5-volt signal from say a micro-controller or logic gate can be used to control a particular circuit load, and this is achieved with the use of opto-isolators. Similar to an electro-mechanical relay, a small input voltage, typically 3 to 32 volts DC, can be used to control a much large output voltage, or current. However, solid state relays with very high current ratings (150A plus) are still too expensive to buy due to their power semiconductor and heat sinking requirements, and as such, cheaper electro-mechanical contactors are still used. Solid state relays can be bought in standard off-the-shelf packages ranging from just a few volts or amperes to many hundreds of volts and amperes of output switching capability. Solid state relays have no such limitations. While the solid state relay and electro-mechanical relay are fundamentally similar in that their low voltage input is electrically isolated from the output that switches and controls a load, electro-mechanical relays have a limited contact life cycle, can take up a lot of room and have slower switch speeds, especially large power relays and contactors. Solid state relays can be designed to switch both AC or DC currents by using an SCR, TRIAC, or switching transistor output instead of the usual mechanical normally-open (NO) contacts. Just like a normal electro-mechanical relay, SSR’s provide complete electrical isolation between their input and output contacts with its output acting like a conventional electrical switch in that it has very high, almost infinite resistance when nonconducting (open), and a very low resistance when conducting (closed). We are happy to help and advice.Unlike electro-mechanical relays (EMR) which use coils, magnetic fields, springs and mechanical contacts to operate and switch a supply, the solid state relay, or SSR, has no moving parts but instead uses the electrical and optical properties of solid state semiconductors to perform its input to output isolation and switching functions. Most competitive prices for Forbes & Lomax, Focus, Heritage, Hamilton. Please email us a list and we’ll do our best to find savings for you. Socket & Switches – let us surprise you with our prices. We’ll do our best to improve our already competitive prices where possible. “Add to quote” – this option allows to you gather items together and ask us for a no obligation quote. Returns – we are happy to accept returns. Our stock is improving regularly, and we keep adding new products to our website. Please let us know should you like to discuss anything and we’ll get you in touch with an electrician who can provide a professional advice! Our goal is to provide one stop place for electricians and electrical contractors, but we are happy to help other clients too. You can call, txt, what’s up or email us with all your enquiries. We are happy to help and get for you any information you require by contacting manufacturers and suppliers. With us you’ll get a personal and dedicated service whether you are looking for a large order or one item.
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