• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Gas discharge tube based mains transient protector......upstream of mains input fuse?

Not open for further replies.


Well-Known Member

We have designed a 40W non-isolated , offline, 230VAC LED lamp.

For transient protection, we have a 470V gas discharge tube (Bourns, 2051-47-SM-RP-LF) in series with a 270V “surge absorber” (Panasonic, ERZVF2M271).

ERZVF2M271 datasheet:

2051-47-SM-RP-LF datasheet:

This transient “block” sits across live and neutral, just downstream of the fuse. The fuse is the first thing after the mains input connector.

Our contractor tells us that because the Gas Discharge Tube will always fail open circuit, we should therefore move the fuse downstream of the Gas discharge tube based transient protector. –This way, when the gas discharge tube flashes over due to a transient, the fuse will not blow , and so the product will stay functional for longer.

Do you agree? Should we do this?
Not open for further replies.

Latest threads

EE World Online Articles