CT Multilayer Varistors EPCOS CT Series Multilayer Varistors offer surge current up to 1200A, bidirectional protection, no derating up to +125ºC, and fast response (<,0.5ns). EPCOS CT Series Multilayer Varistors are suitable for lead-free soldering and are RoHS-compatible. Applications include ESD protection in mobile phones, cordless phones, accessories, data bus applications, control electronics, detectors and sensors, touch screens, plug-in cards, and remote controls.