What’s the difference? Low-level triggered will allow the current to go through the power line when the control signal is below a certain voltage. High-level triggered will allow the current to go through the power line when the control signal is above a certain voltage.

What is high trigger relay?

It is a HIGH-level trigger relay, apply to Arduino and Raspberry Pi. Relays are suitable for driving high-power electronic devices such as lights, electric fans, and air condition. A relay can be used to control high voltages with a low voltage by connecting it to an MCU.

Will 5V trigger a 12v relay?

You cannot activate a 12Vdc relay with 5V.