The vacuum encapsulation ensures excellent voltage resistance, secure network separation, and high electrical safety. Additionally, it offers robustness even in challenging operating conditions, optimal protection in harsh environments (moisture, vibrations, etc.), resulting in a long service life. All transformers are equipped with additional safety features. The 35 VA and 55 VA types have a self-resetting thermal switch (short-circuit and overload protection), while models from 100 VA onwards also include an externally replaceable glass tube fuse.