When using an inductive load such as a relay, always connect a diode (voltage
resistance 100V or more, 100mA or more) in parallel to the load.
(Note 2) When using a capacitive load such as a lamp, always connect a protective resistor
(R=150Ω ) serially to the load to suppress rush currents. (Make sure that the current
is less than the above tolerable current including the momentary current.