Dry contacts (also called potential-free contacts) are relay contacts that are completely isolated from the device's own power supply. Here's what this means:
Regular relay contacts: The switch contacts are connected to the device's internal power circuits
Dry contacts: The switch contacts are completely separate - like a mechanical switch with no electrical connection to the device itself
Why this matters for you:
- You can switch any voltage through the contacts (within rating limits)
- The contacts can break both live AND neutral lines safely
- No risk of electrical interference between your load circuit and the device's control circuit
- Perfect for true 2-pole switching applications