protronic Innovative Steuerungselektronik GmbH designs and builds control electronics for Feststellanlagen — hold-open systems for fire doors and gates — and motor controls for smoke and fire curtains, including its RZ3 fire safety control system, all manufactured in Bennewitz, Saxony. The company is a supporting member of the RAL-Gütegemeinschaft Rauch- und Wärmeabzugsanlagen and operates under RAL quality assurance alongside DIN EN ISO 9001 certification. Its hold-open control range supports the DIN 14677 servicing regime carried out by RWA specialist firms.