Reed switch

[bromleybysea]

Hi folks. I am repairing a small Plastimo dan-buoy light that is operated by a small reed switch, which is broken.. Maplin list four as below:

MicroMin Reed Sw N/O
Micro Reed Sw N/O CL37S 95 1.29
Mini Reed Sw N/O CL38R 90 1.29
Micro Reed Sw C/O


Can someone tell me which one I need? What is the signifgicance of N/O and C/O? Thanks.

 

[mainmarine]

NO = normally open, switch is off when not magnetised
NC = normally closed, switch is on when not magnetised

 

[cpedw]

CO = Changeover - it has 2 outputs, one on and one off, changing when activated.

 

[colvic987]

is it acually broken or just stuck in the off position, i had problems with my switch but it was fixed easily, just a quick tap will release the switch and should start working as it should again...