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Safety transformers

  • General
  • Technical Table
  • Documentation

Applications
Going from supplying power to a bell circuit, to supplying power to the control circuit of impulse switches, relays or contactors for the control of lighting, heating, etc.


Features
Safety transformers have short-circuit protection and continuous nominal power. Bell transformers are recommended for intermittent use at the nominal power declared (50% for continuous use). Full power available at all secondary voltages. The safety terminals are equipped with captive Pozidriv screws and have IP20 protection degree.


Function
Reducing the voltage to a very low (safety) voltage used mainly as control-voltage in order to reduce the risk of electrocution due to environmental circumstances (I.e. high degree of humidity like out- doors, in a swimming pool complex, etc.).


Standards
IEC 61558-1-2-6: Safety transformer
IEC 61558-1-2-8: Bell transformer

Nominal primary voltage and frequency
230V 50Hz / 240V 60Hz
Secondary voltage at nominal primary voltage
12 or 24V
Maximum secondary voltage at zero load
1.5xUn sec.
Minimum secondary voltage at nominal load
0.85xUn sec.
Maximum load
Nominal power
Short-circuit protection
PTC
Operating temperature
-20...+40°C
Isolation voltage
4kV
Protection degree
IP 20
Screw
Pozidriv 1
Terminal capacity: min/max
1x1mm^2 / 1x16mm^2 or 2x6mm^2

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