What this module does 30A relay module with normally open interfaces designed to switch current AC or DC loads safely and reliably. Maximum load: AC 250V / 30A, DC 30V / 30A. Key benefits (why you need it) load capacity: handles up to 30A for heavy appliances, motors, heaters, or lighting without the need for additional relays. Reliable isolation: SMD optocoupler isolation protects the control circuit from switching transients and improves driving stability. Low drive requirement: trigger current only 5mA, reducing the burden on the controller's output pins. Flexible control logic: jumperselectable or lowlevel triggering makes the module compatible with different control signal conventions. Safe default behavior: faulttolerant design ensures the relay will not operate if the control line is broken, reducing the risk of unintended switching. Visual status: green power indicator and red relay state indicator provide quick, clear feedback during installation and operation. Compatibility and performance Available in 5V, 12V, and 24V versions to match common control voltages. Designed for lowvoltage digital control signals with a 5mA trigger current requirement. Normally open contacts suitable for switching circuits that should remain open until actively driven closed. Practical applications (examples) 1. Home automation: control AC pumps, water heaters, or power lights from a central controller while keeping the controller isolated from mains. 2. Industrial equipment: switch motors or heating elements up to 30A using PLCs or other lowvoltage control systems with jumperselectable trigger logic. 3. Prototype and test benches: safely drive and monitor heavy loads during development with clear power and relay state indicators. What's included in operation Jumper to select level or lowlevel trigger. SMD optocoupler isolation for improved drive and stability. Power indicator (green) and relay state indicator (red) for status monitoring. This module provides a compact, robust solution for switching current AC or DC loads while protecting and easing the job of your control electronics.