Isolating switching amplifier, 2-channel, operating voltage 20,250 VAC / 20,125 VDC, two transistor outputs, adjustable operating direction (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, UL, CFMUS, CSA, TR CU, NEPSI, KOSHA, TIIS, CCOE, INMETRO, use in zone 2