Maker Pro
Maker Pro

Solid State relays

K

karthik

Jan 1, 1970
0
I am using Solid state relays to On/Off heaters so as to control
temperature.
In case if heaters get short,immediately the Solid state relays ( SSR )
also gets short and
I need to change new one.Even though I have Fuse protection the SSR and
Fuse gets blown.
Since the Cost of SSR is high,I have so many troubles.

So any one Please suggest some ideas to prevent SSR failure.Is there
any protection like
Varistors , RC circuit to prevent this
 
J

JeffM

Jan 1, 1970
0
I am using Solid state relays to [turn] On/Off heaters
so as to control temperature.
[When the] heaters get [shorted]
karthik
What is causing that? Deal with that first.
..
..
immediately the Solid state [relay] ( SSR ) also...[shorts]
and I need to change [it for a] new one.
Even though I have Fuse protection[,]
the SSR and Fuse gets blown.
If you aren't shorting out the load (see above),
and are simply running the devices near their limit,
such that they get too hot:
http://www.google.com/images?q=Solid-state-relays+OR+Solid-state-relay+heatsink
..
An obvious source of problems:
Are the SSRs too small or is the fuse too big?
Have you tried a smaller fuse with a time-delay characteristic?
Have you measured the surge current of the heaters when they are cold?
..
..
Varistors , RC circuit to prevent this
Won't help if the load is just resistive (heaters).
 
Top