Load switch cannot store energy

How does a load switch operate with an inductive load?

Application diagram of operating a load switch with an inductive load When an inductive load is connected to a power supply and the switch is closed, the current flows through the coil and generates a magnetic field.

What is a load switch?

The load switch is a kind ofswitching device between the circuit breaker and the isolating switch. It has a simple arc extinguishing device, which can cut off the rated load current and a certain overload current, but cannot cut off the short circuit current.

What happens when a switch is opened?

When the switch is opened, the current is interrupted and the magnetic field changes in strength and collapses. This induces current flow in the opposite direction, according to Lenz’s Law. A negative potential is created where there was once a positive potential, and vice versa. This is commonly known as fly-back behavior.

What is a low voltage load switch?

And the role of electric power. The low voltage load switch is also called theswitch fuse group. It is suitable for AC power frequency circuit to manually switch on and off the load circuit manually; it can also be used for line overload and short circuit protection.

What happens if inductive load is not protected?

Operating inductive loads without protection can severely damage switches and greatly shorten any product’s service life. To avoid this, a diode – to prevent unwanted fly-back operation – placed in parallel with the inductive load is recommended. An additional output capacitor can be added, but, in this case, circuit fall time increases.

What is transfer current in a load switch?

To the load switch. When the fuse and the load switch are switched off, thesymmetrical current is called "transfer current". Obviously, the value of the transfer current is related to the fuse's amp-second characteristic and the load switch fixed breaking time. The transfer current value can be determined by reference to the IEC-420 standard.