Ac or dc electric strike?

[SUNRAY]

Have you tried disconnecting the strike (just one wire is adequate) and repeat the voltage measurements above?

A very quick google search for the resistance of the 203 strike comes up with 8 (or 17)Ω which would be 3(1.4)A at 24V, my guess is the PSU is incapable of providing 3(1.4)A.

Actually perhaps you should disconnect the strike and measure the voltage on the cable.

 

[Harry Bloomfield]

Actually perhaps you should disconnect the strike and measure the voltage on the cable.

Checking the voltage at both ends of the cable, with the release pressed, might give some better ideas.

 

[SUNRAY]

Checking the voltage at both ends of the cable, with the release pressed, might give some better ideas.

Yes I concur, however the bit we have seen isn't a 'bit of nothing' and OP says about 3m long.

EDIT: If it is a 24V 1A supply as indicated in the link I think it's looking like an obvious contender

 

[Harry Bloomfield]

Yes I concur, however the bit we have seen isn't a 'bit of nothing' and OP says about 3m long.

Which might be wired in phone wire.

 

[Daljit]

Supply to camera doorbell is 24v, but this is reduced to 12-15v which the manufacturer confirmed and multimeter shows once existing strike was removed. See pics.

All wiring from video monitor to doorbell to strike is 1mm2 two core flex.

Phew, got there in the end.

 

[sparkymarka]

Actually perhaps you should disconnect the strike and measure the voltage on the cable.

A very quick google search for the resistance of the 203 strike comes up with 8 (or 17)Ω which would be 3(1.4)A at 24V, my guess is the PSU is incapable of providing 3(1.4)A.

A bell systems 203 strike ( AC ) is 30ohms …a DC strike is around 8ohms but I’ve known DC strike to be as high as 70ohms failed locked and failed unlocked …