When changing to the case when I do level change of an electric signal and a mechanical movement, an organization part of the electromagnetic system is used. A relay, a motor and a solenoid move by an inductor both. An inductor causes the back electromotive force with the big energy by opening and shutting of a drive circuit. When an opening and shutting circuit is a ari point of arrangement, a spark occurs to a point of tact and a radio wave will be the cause which brings and gives interference to an electronic circuit. It itself also consumes and transforms solvent welding in an interface remarkably by a spark, and a point of arrangement makes them reduce the point of tact life expectancy. A used circuit is being called spark quench circuit and an inserted part is being called a spark killer to stop the reverse electromotive pressure and a point of tact spark.
(a) it's inserted during a point of arrangement and a spark of a point of tact is prevented.
(b) it's installed near the source of the reverse electromotive pressure and noise radiation from a lead line is stopped.
(c) insulation breakdown of a semiconductor is protected.

 

Since putting it in the automatic control system of the factory which invades the power supply which invades a power supply, prevents the lead noise which flows and prevents a system failure, prevents the lead noise which flows and prevents a system failure, it's established to prevent a malfunction accident by the noise I invade from a power supply line. There is also a purpose of preventing the noise which generates the equipment inside itself preventing leaking in a power supply line and affecting to other equipment. A coil, a condenser and ferrite can be named as the electronic component and the data used for a noise filter.

 

A surge makes the thunder, the electromagnetic induction and the static electricity a source, and has very high occurrence voltage more than noise and moreover I possess high current. A recent electrical appliance comes to have a high gate density remarkably for becoming multifunctional, and I have the fault that they're weak in a miniaturized other side surge. We assume that a surge invades an electronic circuit in an instant, and an electronic component is destroyed. A surge absorber and a surge protector are something necessary as the measure which protects an electronic circuit from these surges.