Ventilation Plates for Schneider Electric Modular Contactors When modular contactors are installed with more than two adjacent units they need to be spaced apart to ensure adequate cooling, to achieve this, the ventilation plate must be used Schneider Electric Modular Contactors Low noise a.c. compact modular contactors and accessories are ideal for heating lighting and building service type applications. The units are designed for mounting in control panels or cabinets on symmetrical DIN rail or they may be housed in modular enclosures.