Bell transformers are optimized for short-term use, as occurs with bells, gongs, chimes, and door openers in residential areas. Safety transformers are suitable for continuous operation. All transformers meet the highest environmental protection requirements, are tested according to EN61558, and have certification. They are suitable for installation in electrical distribution boards and flat distributors. The fail-safe transformer meets the highest environmental protection standards and is tested according to EN61558-2-8:2011. It is certified and marked with the ENEC symbol for use throughout Europe. In the event of improper use, permanent failure may occur.