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5.50 General Catalogue • Modular Devices • Technical

Transformers

Safety Transformers

These transformers are designed to ensure personal safety, their

primary winding are electrically separated from their secondary

windings and they are intended to feed separated extra low voltage

circuits U 50V. A thermal overload, in the primary windings, ensures ≤

that if a short circuit or an overload occurs in the output it will not

damage the device.

Bell Transformers

Bell transformers are similar to safety transformers but the

secondary voltages do not exceed 24 volts, they are also similarly

protected against short circuits and overloads, by thermal protection

in the primary winding.

Compliance with the Standards

The bell and safety transformers conform with BS EN 61558.

Where transformers are to be used in a common enclosure with other

devices heat dissipation inserts LZ060 should be used.

Recommendation of Use

• To link only one secondary (never link both simultaneously)

• Do not connect (in series or in parallel) secondaries of different

transformers

24 V230 V

U1

U2

U3

Technical Specification

ST301 ST303 ST305 ST312 ST313 ST314 ST315

Nominal Power4VA8VA16VA 25VA 16VA 40VA 63VA

Designation BellBellBellSafety Safety Safety Safety

Primary Voltage230 Volts230 Volts230 Volts230 Volts230 Volts230 Volts230 Volts

Secondary VoltageU28 Volts8 Volts8 Volts12 Volts12 Volts12 Volts12 Volts

In = 0.5AIn =1AIn = 2AIn = 2.08AIn = 1.33AIn = 3.33AIn = 5.25A

U312 Volts12 Volts12 Volts24 Volts24 Volts24 Volts24 Volts

In = 0.33AIn = 0.67AIn = 1.33AIn = 1.04AIn = 0.67AIn = 1.67AIn = 2.63A

No Load U212 Volts15 Volts12 Volts14 Volts16 Volts14 Volts14 Volts

Secondary Voltage U318 Volts22 Volts19 Volts29 Volts30 Volts27Volts27 Volts

Galvanic Insulation4kV 4kV4kV4kV 4kV4kV 4kV

Max Functional Temperature35ºC 35ºC 35ºC 35ºC 35ºC 35ºC 35ºC

Overload and S/C ProtectionThermal cut out in the primary winding

Insulation ClassHHBBBBH

Produktspecifikationer