Meters -EL357N-C Optocoupler Isolation Module Signal Level Convert PNP 3.3V Highlights Generic Brand EL357N-C Optocoupler Isolation Module Signal Level Convert PNP 3.3V Description: A mini optocoupler isolator , signal level conversion module. The 24V side can be connected with the long wire button, the output side connected to the MCU IO pin. Suitable for general level conversion, such as 24V. With entry indicator. Specification: Size: 7.4 x 25 mm / 0.3 x 1 inch Optocoupler: EL357N Working Frequency: <2K Hz Signal Output: PNP Input Signal Voltage: 24V Output Signal Voltage: 3.3V, 5V , 12V, 24V Operating temperature: -40~85 Input reverse connection protection diode: Yes When input without signal, output high level When input with signal, output low level Package includes: Module 1 Piece Optocoupler Isolation Kit