BH 5903 emergency stop module with mains failure detectionIdeal for systems that should restart automatically when voltage is present again following a mains failure, e.g. in compressor control applications, hydro-engineering and wastewater engineering. Monitors the actuating time of the on switch. Will not start if the actuating time is longer than 3 s Safety category 4 in accordance with DIN EN 954-1 for 1 emergency stop circuit with 2 channels Also for 2 emergency stop circuits with 1 channel Cross-fault detection Detects contact between wires and wire breakage on all inputs **Input** |   ---|--- Nominal voltage UN: | 24 Vdc Voltage range: | 0.85 → 1.15 UN Control voltage/current: | 23 Vdc @ UN / per 4.5 mA @ N Device protection: | Internal with PTC **Output** |   Contact assignment: | 2 NO, 1 NC (for one detection signal) Typical switch on time @ UN: |   Manual start: | max. 45 ms Automatic start: | max. 800 ms if voltage failure > approx. 150 ms   | max. 7 s if