Single channel simple magnetic relay for PCB mount. this module is in line with international safety standard, control areas and load area have the isolation groove; blue KF301 terminal line more convenient. USES the loose quality goods relay; dc or ac signal control, can control 220 v ac load; have power and relay operation instructions, and bright, disconnect the dawn; signal input signal, the public end and will often start conduction; can be used as a microcontroller development board module, can be used as a home appliance control; and one often opened a normally closed contact;