ST-4-28

Power Transformers Overview

The Signal Transformer ST-4-28 is a laminated core power transformer with a 6VA rating. It features a single primary winding rated for 115V and dual secondary windings supporting parallel (14V, 400mA) or series (28V, 200mA) configurations. The unit utilizes through-hole mounting with PC pin termination. Key electrical specifications include a 2500Vrms isolation voltage and operation at 50/60Hz frequencies.

Power Transformers Feature Summary

• Dual secondary winding architecture enabling flexible parallel or series output connections
• Laminated core construction designed for standard 50/60Hz line frequency applications
• Through-hole mounting style with PC pin termination for secure board integration

Power Transformers Applications

• General purpose AC to DC power supply circuits
• Industrial control panel power distribution
• Electronic equipment requiring isolated low-voltage DC rails

Power Transformers Procurement Notes

Verify the specific manufacturer designation, as the component is associated with both Signal Transformer and Bel Fuse branding. Confirm that the required secondary configuration matches the available parallel or series options. Ensure the PCB layout accommodates the through-hole pin spacing and physical dimensions specified in the official datasheet before finalizing procurement.

Power Transformers Selection Notes

Select this model when a 6VA capacity is sufficient for the load requirements. Choose the parallel secondary configuration for higher current needs at lower voltage, or the series configuration for higher voltage at reduced current. Ensure the application environment supports the thermal characteristics of a laminated core transformer without forced air cooling.

Power Transformers Part Context

This component belongs to the ST series of power transformers from Signal Transformer. The series offers various power ratings and voltage combinations tailored for different industrial and commercial applications. The ST-4-28 specifically addresses the need for moderate power isolation with versatile secondary output options.

Power Transformers Replacement Considerations

The ST-4-28 has a direct substitute part number listed as PSS4-28. Verify compatibility with alternative models such as F28-200 if minor parameter deviations are acceptable within the system design constraints.

Power Transformers FAQ

What is the maximum isolation voltage of the ST-4-28?

The transformer provides an isolation voltage of 2500Vrms between the primary and secondary windings.

Can the secondary windings be used independently?

Yes, the dual secondary windings can be connected in parallel for increased current or in series for increased voltage.