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+--- Thread: N20 CT Shorting terminal board (/showthread.php?tid=8883)
N20 CT Shorting terminal board - WestCoastXS - 01-05-2026
Generally current transformers should have the ability to be shorted in order to perform maintenance. Disconnecting a current transformer while it is installed on a current carrying conductor can result in damage, although at residential current levels this is not as likely.
Often shorting terminal strips are used but on a whim I've decided to make my own shorting terminal block tailored for my N20.
Components are almost all on hand.
Waiting for a DIN rail mounted pcb holder to arrive.
Once that shows up I'll confirm measurements and send the circuit board design for fabrication.
RE: N20 CT Shorting terminal board - admin - 01-05-2026
good job, thanks share your result.
RE: N20 CT Shorting terminal board - WestCoastXS - 01-18-2026
From render above to reality.
Will install soon. Should cleanup my N20 installation somewhat.
RE: N20 CT Shorting terminal board - admin - 01-18-2026
when "short", do you means the CT sensor + and - terminal will be short?
RE: N20 CT Shorting terminal board - WestCoastXS - 01-18-2026
(01-18-2026, 11:36 AM)admin Wrote: when "short", do you means the CT sensor + and - terminal will be short?
Yes. If a current transformer is still attached to the primary circuit when the secondary is disconnected it must be shorted.
Best case scenario nothing happens, worse case it burns itself out, worst case it starts a fire or explodes.
RE: N20 CT Shorting terminal board - Vega - 03-10-2026
(01-05-2026, 04:41 AM)WestCoastXS Wrote: Generally current transformers should have the ability to be shorted in order to perform maintenance. Disconnecting a current transformer while it is installed on a current carrying conductor can result in damage, although at residential current levels this is not as likely.
Often shorting terminal strips are used but on a whim I've decided to make my own shorting terminal block tailored for my N20.
Components are almost all on hand.
Waiting for a DIN rail mounted pcb holder to arrive.
Once that shows up I'll confirm measurements and send the circuit board design for fabrication.
How does it fit and work
Do you have in use photos?