Safety isolating transformer, 24VA Primary AC 230V, 50Hz, Secondary 8V, 12V AC with PTC fuse, 3TE++ Safety isolating transformers provide a safety extra-low voltage to supply control circuits, switching relays or Insta contactors. These safety isolating transformers up to 63 VA provide a safety extra-low voltage to supply control circuits, switching relays or Insta contactors in continuous operation as an AC power supply for AC 8 V, 12 V, 16 V, 24 V and 32 V. Siemens safety transformers are protected against short circuit or moderate overload by a PTC resistor. Whether for infrastructure or industrial requirements, Siemens offers safety transformers for all applications and every field of use. The main features of Siemens power supplies are: 1. convenient and simple installation as well as connection technology. 2. reliable safety during installation thanks to standard protection against accidental contact. 3. integrated short-circuit and overload protection. 4. optimum.