How to replace a mechanical relay with a solid-state equivalent circuit?

hkBattousai

Member

• Feb 2, 2011

• #1

The problem:
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The mechanical relay which is to be replaced:
**broken link removed**

Can you suggest me an equivalent solid-state circuit?

 

blueroomelectronics

Well-Known Member

• Feb 2, 2011

• #2

A typical SSR would work.
**broken link removed**

 

hkBattousai

Member

• Feb 2, 2011

• #3

Hmm, I never expected to solve this problem with a single element like this. Very good.
If there is a solid-state relay, why people keep using old mechanical relays? Are they cheaper?

 

C

cowana

New Member

• Feb 2, 2011

• #4

Often cheaper, more resistant to interference, high voltage spikes, overload etc.

 

crutschow

Well-Known Member

Most Helpful Member

• Feb 2, 2011

• #5

Mechanical relays are especially cheaper for multi-pole, double-throw devices.

 

cr0sh

Member

• Feb 2, 2011

• #6

Also - larger SSRs (not like the posted image) controlling larger currents require heatsinks, which adds to the cost. Something to check out is the various documents, faqs, etc at Omron's site:

Overview of Solid-state Relays | OMRON Industrial Automation
Solid-state Relays - FAQ | OMRON Industrial Automation

Lotsa good stuff there...

 

K

KMoffett

Well-Known Member

• Feb 3, 2011

• #7

Also AC SSR's do not break the circuit completely. There can be a very small amount of leakage current when they are off. In most line voltage applications this is irrelevant, but in some applications it can be important.

Ken