the contacts in this series are touch proof and designed to prevent damage from arcing if disconnected under load. Ensuring fail-safe conditions for both the equipment and the operator. Speakon® meets the prevailing safety standards of IEC65, IEC348, CE, CSA and are UL rated (file #E135070). Connector type: Chassis connector/panel receptacle, 4-pole, "D" series style with air-tight seal.