"With delay to energise on a rising current". The output relay delays to energise for up to 10 secs when the monitored current rises above the set level as selected by the front potentiometer. It will de-energise when the current falls below the set level less a fixed hysteresis of 1 % against the set level. De-energisation will also occur if the auxiliary supply is lost.
The MOD-I can be used to monitor a 3 phase motor by passing one phase into terminal A1 and out on the relevant I., terminal to the load. The panel Neutral needs to be connected to terminal A2 even if the load does not have a Neutral connection.

The YRI-31 is a direct connected current proving switch in four different adjustable ranges, 01-1 A, 0.3-3A, 0.5-5A, 1-10A. External current transformers cannot be used with the YRI-31. The current is monitored on its own supply hence a separate auxiliary supply is not required.
On connection of the supply/load the green LED illuminates, should the load exceed the adjustable setpoint the SPCO relay output will energise and the red LED will illuminate. Should the load then fall below the set level, less than a nominal 1% hysteresis the output relay will de-energise and the red will be extinguised.