Products

DescriptionIn advanced hardware engineering, mechanical wear and tear is the enemy of longevity. When designing automated lighting controls or an IoT smart box that needs to toggle AC mains hundreds of times a day, traditional clicking relays will eventually fail. The 5V Solid State Relay (G3MB-202P) solves this by using semiconductor technology to switch power completely silently, offering a massive lifespan upgrade for your custom PCBs.How Solid State Works (Optical Isolation)Instead of an electromagnet pulling a physical metal lever, an SSR uses light. When you apply 5V DC to the input pins, an internal microscopic LED illuminates. A light-sensitive semiconductor on the high-voltage side detects this and bridges the AC load circuit. This provides absolute galvanic isolation between your delicate logic board and the dangerous mains power, ensuring maximum safety.Zero-Cross Switching (Crucial Feature)AC power travels in a sine wave, constantly crossing zero volts. This specific G3MB-202P relay features a “Zero-Cross” switching circuit. When triggered by your microcontroller, it waits for the exact millisecond the AC voltage hits zero before turning the load on or off. This prevents massive electrical noise, sparking, and voltage spikes, keeping your other sensors reading clearly without interference.AC Load Warning (Important Design Note)This relay is for AC (Alternating Current) loads ONLY. Due to the internal TRIAC architecture, it cannot switch DC loads (like 12V DC motors or LED strips). Once triggered while connected to DC power, the internal switch will not turn off until the load voltage drops to zero—which never happens in a pure DC circuit! Use this exclusively for household AC appliances and mains-powered gear.Key Features:Completely Silent: No mechanical clicking, making it perfect for bedroom automation or quiet environments.Infinite Lifespan: Zero moving parts means no contact arcing or mechanical degradation over time.Logic Level Compatible: Directly triggerable from standard 5V logic pins with minimal current draw.Technical Specifications:Model: G3MB-202PInput Control Voltage: 4V to 6V DC (5V Nominal)Load Voltage Range: 75V to 264V ACMaximum Load Current: 2A (Requires derating if used in hot, enclosed environments)Isolation: Phototriac / OpticalPackage Type: 4-Pin SIP (Single In-line Package)Ideal Applications:Silent AC switching inside residential IoT smart boxesControlling household lamps, fans, and small AC water pumpsUpgrading mechanical relay boards for higher reliabilityInterfacing 5V logic controllers with 240V AC automation systemsRead more Technical Explanation for Solid-state Relays here in this  document.Document:Technical Explanation for Solid-state Relays