Is it possible to substitute an SCR power controller with a relay/contactor?

Thread Starter

Rahulk70

Joined Dec 16, 2016
521
Hi folks,
I have an SCR SSPC controller that I got recently. This is the first time I actually got to play properly with an SCR controller.

The specs of the SCR SSPC are:
WATLOW DB20-24CO-0000
Input trigger : Pin 7&8 @ 4-32VDC
Mains Input: Pins 1,2,3(3-phase)/ 1&2 or 2&3 (single phase)
Mains output: Pins 4,5 &6.
Rated current :25 Amps
Input voltage: 100~240V

The input trigger I've used is a fully charged Li-ion cell at 4.17V at PINS 7&8. According to these specs, we can obtain a small and higher current relay which is smaller or even a contactor. The SPC is very bulky and heavy with all the metal sink.

So, is there any advantage of using an SCR SSPC over a relay? Also is an SCR SSPC same as an Solid State Relay?
Thanks.
 

Attachments

MaxHeadRoom

Joined Jul 18, 2013
24,235
That's not your average SSR, that is for switching 3ph with back-to-back SCR's for 3ph loads motors etc.
SSR is Solid State Relay. SSRPC Solid State Power Controllers.
The one advantage that I can see is that you do not get contact arcing or degradation.
These are very similar to solid state soft starters for 3 ph motors.
Max.
 
Last edited:
Top