Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

SCR REC

Symbols

Thyristor phase-controlled rectifier

A phase-controlled rectifier uses thyristors instead of diodes, so the firing angle sets the average DC output voltage. Six-pulse bridges are widely used for large battery chargers, electrolysers, DC drives and older UPS rectifiers because they are robust and simple to control.

Drawing use: SLD / Schematic
Application: Microgrid systems
Reference family: IEC / IEEE / ANSI

A distinction that matters

A phase-controlled rectifier sets voltage by firing angle; an active front-end rectifier uses switched transistors and can run near unity power factor.

Full reference

SCR

Symbols

Silicon-controlled rectifier

An SCR is a thyristor with a gate-controlled triggering function in its documented circuit. Anode, cathode and gate connections must be distinguished to understand the control path.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

An SCR is not the same as a bidirectional TRIAC.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.