Self or Dual-Powered Supply for Protection Relay, MCCBs & ACBs Ref Design


Design files


This power supply solution for Protection Relays & MCCBs handles both the current input from a Current Transformer (CT) or input from an Auxillary (Aux) source. The "self-powered" capability comes from being able to harness the power available in the grid through the CT. The flexibility of this solution's "dual-power" input comes from the ability to also handle the Aux input - which is often a battery source.

  • Higher shunt regulation voltage reduces power loss and improves efficiency
  • Provides option for customer to use a CT with lower VA to reduce size of the product/transformer
  • Excellent load transient performance and very sharp turn-on characteristic
  • Simple and cost-effective electrical surge-protection circuitry for a wide range of applications
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU304.PDF (1903 K)

Reference design overview and verified performance test data

TIDR841.PDF (370 K)

Detailed schematic diagram for design layout and components

TIDR842.PDF (107 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDR843.ZIP (1524 K)

Files used for 3D models or 2D drawings of IC components

TIDC499.ZIP (819 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.


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Isolated DC/DC converters & modules

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

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Technical documentation

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Type Title Date
* Design guide Self/Dual-Powered (Current or Auxiliary DC) Supply for MCCB/ACB/Protection Relay Apr. 28, 2014
Technical article What are the experts saying about TI's reference design for Self / Dual-Powered Supply for Relays and Circuit Breakers? Sep. 25, 2014

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