Isolating switching amplifier. 4-channel. Ident. no.: 7541188. 5 relay outputs (NO). Output mode adjustable (NO/NC mode). Input circuits monitored for wire-break/short-circuit (ON/OFF switchable). Common alarm output. Complete galvanic isolation. Input reverse-polarity protected. ATEX, IECEx, UL, CFMUS, CSA, TR CU, INMETRO, TIIS, NEPSI. Installation in zone 2