Zener Diode Barrier Dimensions Series 51-SY 41 51-SYE100-A 12.5 115 110 R Barrier Safe Z728.H Hazardous Area/ Ex-Berelch X3 7 8 2 1 5 6 7 8 1 2 3 4 >PC< Safe Area/ Nicht Ex-Bereich Unspecified equipment V 250V Terminal No. indication (Non-hazardous side) Barrier input: 24 VDC ±10% Terminal for ground (2 parts) (M3 Round head combination screw) Examination certificate emblem (Examination certificate No. TC14452) Terminal No.8: + Terminal No.7: . Terminal No. indication (Hazardous side) Terminal No.1: + Terminal No.2: . Terminal: No.2 Terminal: No.1 Terminal: No.7 Terminal: No.8 DIN rail mountable (width: 35 mm, recommended thickness: 1.2 mm) Manufacturer: Pepperl+Fuchs Note) See P+F’s catalog for options. Terminal No. 2, No. 7 and the DIN rail mounting bracket on the bottom part of the barrier or terminal for grounding are short circuit connected. Caution Zener diode 240 Ω Fuse 1 2 8 7 Internal circuit diagram 51-SYE100-B 61.5 7.5 7.5 49.2 25 14.2 93.5 85 Hazardous area tmnls 3 4 2 1 728P+ 2 1 728P+ MTL 728P+Shunt-diode safety barrier Haz Safe 4 3 2 1 Terminal No. indication (Non-hazardous side) Barrier input: 24 VDC (21.6 to 24.5 VDC) +2% .10 Terminal No.1: + Terminal No.2: . Terminal: No.1 Terminal: No.2 11.5 Terminal: No.3 Terminal: No.4 Terminal No. indication (Hazardous side) Terminal No.3: + Terminal No.4: . Examination certificate emblem (Examination certificate No. TC14453) Terminal for ground (with M nut) (Terminal for earth bus bar mounting) Manufacturer: Measurement Technology Ltd. Note) See MTL Instruments' catalog for options. A