Basler 125-12 Static Voltage Regulator

The Basler 125-12 is a solid‑state static voltage regulator designed for brushless synchronous generators. This compact regulator provides precise automatic voltage regulation (AVR) for small to medium‑sized generator sets in standby, prime power, and mobile applications. The 125‑12 is a reliable, cost‑effective solution for maintaining stable generator output voltage under varying load conditions.

The regulator features solid‑state construction with basic protection functions including over‑excitation limiting and V/Hz protection. It includes a potentiometer for voltage adjustment, a stability control, and LED indicators for status monitoring. The 125‑12 is designed for easy panel mounting with screw terminals for all connections.

Technical Specifications

• Model: 125-12

• Control mode: AVR (automatic voltage regulation)

• Voltage sensing: 120/240 V AC (single‑phase)

• Field output: Up to 5 A continuous

• Regulation accuracy: ±1% of setpoint

• Protection: Over‑excitation, V/Hz, loss of sensing

• Adjustments: Voltage setpoint, stability (gain)

• Power supply: Self‑excited from generator sensing

• LED indicators: Power ON, excitation ON, fault

• Operating temperature: -40°C to +70°C

• Dimensions: 130 x 100 x 50 mm

• Certifications: CE, UL, RoHS

Functional Features

• Precise voltage regulation: Maintains output voltage within ±1% of setpoint.

• Voltage build‑up: Self‑excitation from residual voltage ensures reliable startup.

• Protection: Over‑excitation and V/Hz limiters protect the generator.

• LED indicators: Visual status of power and fault conditions.

Typical Applications

• Small diesel gensets: Standby and prime power for commercial and residential applications.

• Portable generators: Mobile power for construction and events.

• Agricultural generators: Power for irrigation and farm operations.

Installation and Configuration

Mount the 125-12 in the generator control panel. Connect the voltage sensing wires to the generator output, the excitation leads to the exciter field, and the power supply (if separate). Adjust the voltage potentiometer to the desired output, and adjust the stability control for smooth regulation.

Compliance

Complies with EMC standards, CE and UL approved, RoHS compliant.

Conclusion

The Basler 125‑12 provides reliable, cost‑effective voltage regulation for small to medium generators, offering essential AVR functionality and protection.