Panasonic ASCT1F46E manual

4.Load, electrical life

22.Contact protective circuit

Use of contact protective devices or protection circuits can suppress the counter emf to a low level. However, note that incorrect use will result in an adverse effect. Typical contact protection circuits are given in the table below.

Also, note that release time will slow down due to sneak in the circuit and may cause the electrical life to shorten and slight-welding.

			Diode circuit
	Circuit

			The diode connected in parallel causes the energy stored in the coil
			to flow to the coil in the form of current and dissipates it as joule
	Features/Others		heat at the resistance component of the inductive load. This circuit
			delays the release time. (2 to 5 times the release time listed in the
			catalog)
			Use a diode with a reverse breakdown voltage at least 10 times the
			circuit voltage and a forward current at least as large as the load
	Devices Selection		current or larger.
	Devices Selection		In electronic circuits where the circuit voltages are not so high, a

			diode can be used with a reverse breakdown voltage of about 2 to 3
			times the power supply voltage.

			Diode and zener diode circuit

	Circuit

	Features/Others		It is effective in the diode circuit when the release time is too long.

	Devices Selection		Use a zener diode with a zener voltage about the same as the power
	Devices Selection		supply voltage
			supply voltage

In the actual circuit, it is necessary to mount the protective device (diode etc.) in the immediate vicinity of the load. If it is mounted too far away, the effectiveness of the protective device may diminish. As a guide, the distance should be within 50cm.

Avoid using the protection circuits shown in the figures below.

Although it is usually more difficult to switch with DC inductive loads compared to resistive loads, use of the proper protection circuit will raise the characteristics to that for resistive loads.


Although it is extremely effective in arc	Although it is extremely effective in arc
suppression as the contacts open, the	suppression as the contacts open, the
contacts are susceptible to welding since	contacts are susceptible to welding since
energy is stored in C when the contacts open	charging current flows to C when the
and discharge current flows from C when the	contacts close.
contacts close.

ASCT1F46E specifications

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delays the release time. (2 to 5 times the release time listed in the

ASCT1F46E specifications