Help Center Technology Pulse transformer technology ISO 9001-2015 Declarations REACH & RoHS Approvals Derating and protection Load and installation limits by temperature Protecting relays from overloading and short- circuits MTTF -values MTTF-values for SL-relays MTTF-values for EX-relays High- and inductive DC-loads (e.g. solenoid valves) How to control high voltage DC How to control inductive loads Ex certificates IECEx ATEX Code of Conduct Troubleshooting Problems relating to electromechanical relays and optocouplers Find a solution on a chart (pdf)