Bell transformer, 18VA Primary 230-240 V AC, 50 Hz, secondary 8 V, 12 V AC With PTC fuse, 2MW++ Bell transformers for controlling bells, gongs, door openers or remote control switches. A typical application for these bell transformers is short-time use, as occurs with bells, gongs, door openers or remote control switches in residential buildings. The rated secondary voltages range from 4V to 24V AC. Siemens bell transformers are protected against short circuits and moderate overload by a PTC resistor. Whether for infrastructure or for industrial requirements, Siemens supplies bell transformers for all applications and every application area. Key features of the network devices from Siemens: 1. User-friendly and easy installation and connection technology. 2. Reliable safety during installation with standard touch protection. 3. Integrated short-circuit and overload protection. 4. Optimized safe power supply technology for your safety – only from Siemens.