Phoenix Contact 2906779 This product provides surge protection with a built-in status indicator and knife disconnection for three signal wires sharing a common reference potential, making it suitable for high-frequency applications such as HF communications and telecommunications interfaces that operate without a supply voltage, supporting data transfer rates of up to 90 Mbps. Additionally, the device uses indirect grounding via gas discharge tube and is HART-compatible, allowing it to be used in safety-critical circuits up to SIL level 3.