Speed monitoring up to 40 kHz, 1 pre-select value with relay output and LED indicator, 2-, 3-, 4-wire and NAMUR sensors as well as rotary encoder connectable, Start-up delay, Menu driven operation via 4 front keys, Housing width: 40 mm, Rated voltage: 200 ... 230 V AC ; 100 … 130 V AC; 50/60 Hz20 VDC ... 30 VDC, Relay: 1 changeover contactNO, NC, COM