Isolating switching amplifier, 1-channel, operating voltage 20,250 VAC / 20,125 VDC, two transistor outputs, short-circuit proof, potential-free and reverse polarity protected, total fault signal output, adjustable direction of action (operating current/quiescent current behavior), monitoring of the input circuits for wire breakage and short circuit (can be switched on/off), SIL 2, all-round galvanic isolation, input protected against reverse polarity, ATEX, IECEx, cUL, cFM, CSA, TR CU, NEPSI, KOSHA, TIIS, CCOE, INMETRO, use in zone 2