Metz Connect Control Relays Threshold switch 623071 - Metz Connect 110666, The Metz Connect 110666 is a threshold switch designed to operate with 24 V AC or DC. It features one change-over contact suitable for various monitoring relay applications. Metz Connect 110666 is typically used for reliable monitoring and control in electrical systems. Metz Connect 110666 Threshold Switch 24 V AC/V DC 1 Change-Over Relay