A41 All-4-One™ International Transformers Bel Signal Transformer A41 All-4-One™ International Transformers are designed to provide the high isolation, creepage, and clearance necessary to comply with international safety standards. Bel Signal Transformer A41 transformers feature 25VA to 175VA power and 400VRMS hipot dielectric strength. The series offers solder lug or quick-connect terminal types and has serial or parallel dual secondaries.