Need Help? Get in touch, 24/7.
We're committed to providing the best customer service in the industry.

Black Box Brand Product Support                                           
Local Calls: 1300 734 455                                
International Calls: +61 3 9237 8100  

Black Box Tech Support
1300 735 566                                   

Or click "Talk With Us" in our top nav to chat with us or to have us call you.

Black Box Explains...Dry contacts

A dry contact, also called a volt-free contact, is a relay contact that does not supply voltage. The relay energizes or de-energizes when a change to its input has occurred. In other words, a dry contact simply detects whether or not an input switch is open or closed.

The dry contacts in the ServSensor Contact provide a simple two-wire interface that can be easily adapted to third-party sensors and devices. Because you define what the open or closed condition means, dry contacts are infinitely adaptable.

Use dry contacts to monitor alarms such as fire alarms, burglar alarms, and alarms on power systems such as UPSs. A very common use for dry contacts is to detect whether a cabinet door is open or closed.