4kV conducted immunity systems offer combination wave surges and electrical fast transients for compliant testing to IEC 61000-4-5 and IEC 61000-4-4. These test systems offer a variety different interfaces, coupling decoupling capabilities, and capabilities. These lower voltage surge systems provide testing solutions for a variety of standards and applications. Most of these systems include a built-in CDN providing 15 amps AC for equipment under test requirements.