Hi all,

I need an overcurrent relay with definite time characteristic taking a CT input for an LV application, ideally without breaking the bank and using a single function device (it's obviously possible with a multifunction protection relay but they're not cheap and the complexity may increase likelihood of misapplied setting). Application is to provide overload protection to a bus with multiple parallel sources (so summation CTs needed, hence not just using a normal device). For the scheme I'd prefer DT rather than IDMT, to discriminate with fault protection as applied to each incomer (the plan is to set relatively slow, but quite tight to the bar rating). I'm probably looking in the wrong place but would anybody recommend one / point me in the right direction?

Thanks,

Jam