Reed Relays remain an attractive solution for switching applications. Having a metallic path, they do not suffer from the relatively high and non-linear contact resistance together with the high off-state leakage current usually associated with solid state relays.
High voltage reed relays are intended for applications where the voltages are beyond the capabilities of conventional reed relays. They use vacuum reed switches to maximise the voltage rating for a given blade separation and to manage arc duration as the contacts open or close.
Any loss of seal will rapidly degrade the switch operation so reed switches have to be carefully managed as they are packaged into reed relays, using suitable encapsulation materials and Pickering’s SoftCenter® technology. The relay design must ensure there is adequate clearance distance both internally and externally for the rated voltages, something which also needs to be considered for the PCB layout.