Power Factor Relay

A power factor relay, or APFC controller, is the brain of a PFI plant. It measures the power factor continuously and switches capacitor steps in and out through contactors to keep the power factor close to the target as the load changes.

Available ratings

6 Stages, 12 Stages

Where it is used

• Automatic PFI plants in factories
• Commercial buildings and shopping malls
• Hospitals and large apartment buildings
• Upgrading old manual capacitor panels

How to choose

• Number of steps: 6 or 12, depending on the number of capacitor stages.
• CT input: 1 A or 5 A.
• Target power factor and switching delay settings.
• Display and alarms: PF, voltage, current and harmonic alarms.

Why buy from Unique Quality Engineering

Since 2012 we have supplied genuine components from ABB, Schneider Electric, Siemens, Mitsubishi and Fuji Electric to panel builders, factories and contractors across Bangladesh. Our engineers help you choose the right rating and model, and we use the same parts in the panels we build ourselves.

Frequently asked questions

What target power factor should I set?

Most industries aim for 0.95 to 0.99, above the minimum level set in the utility tariff.

Why does the relay switch capacitors in and out often?

Steps that are too large, wrong CT position or short delay settings can cause hunting. Correct sizing and settings fix this.

Can I add a relay to an existing capacitor panel?

Yes. We can upgrade a manual or faulty PFI panel with a new automatic relay and contactors.

Need a price for a power factor relay? Request a quotation with the rating and quantity, or call or WhatsApp +8801992-389515.