PURPOSE:To secure safety by facilitating the discrimination of the level of a discrimination current by discriminating and displaying the level of the discrimination current stepwise and activating a display means intermittently when the discriminated level exceeds a maximum value. CONSTITUTION:A table tap includes an insertion plug 1, lines 2 and 3 where a load current flows, and loading outlets 4 and 5, and the plug 7 of a load 6 is connected, flowing a current. Then, the level of a current to be discriminated is discriminated by discrimination levels at a level discriminating circuit consisting of comparators COM1-COM4 and resistances R7-R11, and LED-LDs 1-4 are activated selectively by the output of the discriminating circuit corresponding to the discriminated level. Then, when the current to be discriminated exceeds the maximum value of discrimination levels, the LDs 1-4 are activated intermittently in response to the level discrimination output.
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