Hager General Catalogue

5.51

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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 V

230 V

Technical Specification

ST301

ST303

ST305

ST312

ST313

ST314

ST315

Nominal Power

4VA

8VA

16VA

25VA

16VA

40VA

63VA

Designation

Bell

Safety

Primary Voltage

230 Volts

Secondary Voltage

U2 8 Volts

8 Volts

12 Volts

In = 0.5A In =1A

In = 2A

In = 2.08A In = 1.33A In = 3.33A In = 5.25A

U3 12 Volts

12 Volts

24 Volts

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

No Load

U2 12 Volts

15 Volts

12 Volts

14 Volts

16 Volts

14 Volts

Secondary Voltage

U3 18 Volts

22 Volts

19 Volts

29 Volts

30 Volts

27Volts

27 Volts

Galvanic Insulation

4kV

Max Functional Temperature

35ºC

Overload and S/C Protection

Thermal cut out in the primary winding

Insulation Class

Modular

Devices