Amund:
It's all about speed. If your network has a slow inductive rise time them use
the cheaper MOV. If the little spikes will propagate, as they would in a
capacitive network, then use best to use the transorbs. For your 8/20us pulse
quoted I'd use the transorbs. Also it may be necessary to add some low values
resistors to slow things down and limit current.
Fred Townsend,
DC to Light
Amund Westin wrote:
24VDC port shall be protected against 1kV (line-earth 10ohm) and 500V
(line-line 2ohm). (ref.IEC61000-4-5 8/20us pulse)
Should I go for MOVs or tranzorbs?
I have good experience with MOVs on 230VAC ports, but have not done any
work
on DC ports.
#Amund
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