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5 hours ago, sixwheeledbeast said:

SCB where designed that way.

Tamper return will be +ve if the HO is +ve, you can see the tamper link is still fitted

I thought SCBs were the ones that had the voltage going directly to the bell box and when the alarm sets off, the hold off is cut sounding the bell using its own battery and SABs were the ones that had the trigger voltage?

3 hours ago, Jack b said:

I thought SCBs were the ones that had the voltage going directly to the bell box and when the alarm sets off, the hold off is cut sounding the bell using its own battery and SABs were the ones that had the trigger voltage?

You mean scb mode uses internal battery to activate sounder and hold off is just charging

 

And sab mode draws power from panel hold off when bell activated

 

 

Both have a separate trigger 

 

Or something like that

21 minutes ago, al-yeti said:

You mean scb mode uses internal battery to activate sounder and hold off is just charging

 

And sab mode draws power from panel hold off when bell activated

 

 

Both have a separate trigger 

 

Or something like that

Yep

Self Contained Bell, uses it's own lead acid battery to sound the siren when triggered from panel.

Self Activating Bell, uses the panel voltage to sound the siren when trigger is low, or "hold off" voltage is removed which "self activates" the bell from it's NiCd. Many modern SAB's have a SCB style mode.

11 minutes ago, sixwheeledbeast said:

Self Contained Bell, uses it's own lead acid battery to sound the siren when triggered from panel.

Self Activating Bell, uses the panel voltage to sound the siren when trigger is low, or "hold off" voltage is removed which "self activates" the bell from it's NiCd. Many modern SAB's have a SCB style mode.

You'd find SCBs in chubbs, AFAs, brocks and all that and you'd find SABs in thorns, Abels, modern alarms, etc.

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