Optocoupler Relay Modules and PhotoMOS Relays
Compare optocoupler-equipped electromagnetic relay boards and compact optically controlled solid-state relay components. This collection includes one-, two-, four-, six-, eight- and sixteen-channel board listings, alongside KAQY SOP-4 and AQZ/AQ SIP-4 optocoupler relay part-number menus. These are different switching technologies: a board with input optocouplers and mechanical relay contacts is not a bare photo-relay IC.
Multi-channel mechanical relay boards
Board listings offer selected 5V, 12V or 24V supply versions and channel counts; the available combinations vary by product. One sixteen-way listing offers 5V or 12V variants despite mentioning 24V in its heading. A fixed four-channel board and fixed single-channel 5V board are also listed. The single-channel board description distinguishes its 5V module supply from its 3–5.5V control logic signal. Other sellers describe active-low triggering, optocoupler inputs, NO/COM/NC contacts or separate logic and relay supplies, but these details and ratings are model-specific, not guarantees for every board. Match the exact variant's supply voltage, channel count, control polarity, control-current requirement, contact configuration, physical dimensions and documented load rating. Labels such as “Size,” “Color” and “Current Range” often select channel count, voltage or pack quantity rather than their literal meanings.
Individual optical relay components
KAQY210S, KAQY212S, KAQY213S, KAQY214S, KAQY216A and KAQY212A are offered as selectable codes in a five-piece SOP-4 listing. A separate one-piece SIP-4 menu offers AQZ202, AQZ202D, AQZ202G, AQZ205, AQZ207, AQZ207D, AQZ404, AQZ107 and AQ205D selections. These are component-level optical switching devices, not ready-to-wire multi-channel electromechanical modules. Select the exact code, compare its package drawing, input drive, output topology, on-state behavior and off-state limits against its manufacturer datasheet; similarly named suffixes do not establish interchangeability.
Quantity and safety boundaries
Several board menus select one board, while some options explicitly specify 3, 5, 10 or 20 pieces. A heading listing multiple voltages or channel counts does not ship every version. Seller-supplied certifications, originality claims and numerical contact ratings are not verified across this collection. Optical input coupling alone does not certify a finished board's insulation, safe clearance or suitability for mains switching; verify the exact product documentation and have hazardous-voltage work reviewed by a qualified professional.
Frequently asked questions
Is a KAQY relay the same as an eight-channel optocoupler relay board?
No. A KAQY variant is a small SOP-4 component; an eight-channel board is an assembled controller with multiple relays and support circuitry.
Does a 24V heading mean every relay board accepts 24V?
No. Check the selected voltage variant. Some listings offer only 5V or 12V, and control-signal voltage can differ from board supply.
Does “5V 1 channel 5PCS” mean five channels?
No. It indicates a one-channel model offered as a five-piece selection in that listing. Check channel count and quantity separately.
Can I use an optocoupler input as proof of mains safety?
No. Confirm isolation spacing, ratings, protective design and applicable requirements for the complete board and application.
