What is modular transformer?

What is modular transformer?

Table of Contents

The significance of the modular transformer is to provide SELV protection in accordance with global international standards.

  • SELV: Separated Extra Low Voltage / safety extremely-low voltage Transformers provide power protection for SELV circuits for household, tertiary and industrial applications to ensure proper separation between circuits and protect the end user from accidental contact.

    After they are installed on DIN-Rail and integrated into the consumer unit, they can be used for continuous and discontinuous applications
    Modular transformers need to be combined with the load of a safety very low voltage (SELV) discontinuous power supply before they can be used.
Providing SELV protection for doorbells and bath buzzers in residential environments is the most common application
    DIN rail Bell transformers are suitable for loads that require intermittent power supply at a very safe low voltage (12 to 24 V). In addition to residential applications, its main use is a combination of bells and buzzers for public and tertiary acoustic signals.
    It is precisely because of the perfect isolation and isolation between the primary and secondary circuits that the Bell transformer guarantees a high degree of safety. In addition, the thermal protection device used in the TS transformer is integrated into the secondary, making it resistant to short-circuit current (non-intrinsic short-circuit protection)


How long can a bell transformer supply power? 

    The reference standard EN 61558-2-8 does not specify a specific time, but it points out that “bell transformers are usually used to supply power for household audio signal equipment and other similar equipment that use loads for a short period of time.”
    In addition, regarding the temperature test, it said that “the temperature test is determined in a 20-cycle cycle test, and each cycle test includes a 1-minute simulated full-load running test and a 5-minute simulated full-load running full-load test.” Therefore, a bell is used. The continuous use of the transformer determines that the temperature rise of the transformer may cause it to stop supplying power, unless the work/pause cycle allows the transformer to cool sufficiently.

Is it possible to degrade the power of the bell transformer to a certain extent to continue using it?

    The use of a transformer to provide a load power lower than the rated value reduces the power loss including the temperature rise of the continuous use of the bell-shaped transformer.
    However, a load lower than the nominal load will make the voltage output unstable. According to the standard, the tolerance is 15% at full load and 100% at no load!
    Since this relationship is not linear, a transformer operating under near no-load conditions may produce a voltage output that is 15% to 100% higher than the nominal secondary voltage, thereby endangering equipment that is sensitive to voltage changes.

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