GLOSSARY

Safety transformer

Safety transformer definition

The safety transformer is a transformer for supplying SELV circuits. Safety transformers can be used to fulfill the “safety extra-low voltage” protective measure. Safety transformers are designed to supply a device or distribution circuits with voltages up to 50 V AC or smoothed DC voltage up to 120 V (no-load and load) in order to prevent impermissibly high and dangerous touch voltages in the event of a fault.

Maximum rated values

Input voltage: ≤ 1100 V
Output voltage: ≤ 50VAC or ≤ 120VDC
Frequency: ≤ 500 Hz
Maximum power for single-phase transformers: 10 KVA
Maximum power for three-phase transformers: 16 KVA