Triac Output Overvoltage (Output Off)

What does TRIAC-OVERVOLT-OFF mean?

Excessive voltage is applied to the load when the triac output is in the OFF state. This happens because the load internally performs half-wave rectification, charging an internal capacitor (C). When the supply polarity changes, this charged voltage combined with the line voltage is applied across an internal diode (D1), potentially reaching approximately 2.2 times the supply voltage, risking D1 deterioration or fire.

• Internal half-wave rectification within the connected load (e.g., solenoids) in combination with AC supply polarity changes.
• Overvoltage stress on internal diodes (D1) due to additive voltage effects during the OFF state.
• Risk of diode deterioration or fire if conditions persist.

Click steps to track your progress.

1. 1

   Connect a resistor (several tens to hundreds of kΩ) in parallel across the load terminals. This dissipates excess voltage and protects the internal components of the load from overvoltage during the OFF state.