Basler SSR 125-12 Static Voltage Regulator – Compact and Reliable AVR
The Basler SSR 125-12 (9185900102) is a versatile static voltage regulator designed for generators up to 150 kVA. It accepts a wide AC sensing input of 120, 240, or 480 VAC, making it suitable for various global voltage standards. The regulator provides smooth, precise voltage control with minimal harmonic distortion.
Main Features
Selectable sensing voltage: 120/240/480 VAC via easy jumper settings
Continuous output current: 5 A, peak 10 A for 10 seconds
Regulation accuracy: ±1% of nominal voltage
Built-in over-excitation and under-frequency protection
Droop adjustment for parallel operation (0–10%)
Compact footprint: 150 x 120 x 80 mm
Control and Tuning
The SSR 125-12 features three potentiometers: Voltage setpoint, stability, and droop. The stability control is critical for damping oscillations, and the manual provides a simple tuning procedure using a multimeter. The regulator also includes a remote voltage trim input (0–5 VDC or 4–20 mA) for external setpoint adjustment.
Protection Circuits
An internal under-frequency roll-off reduces the output voltage when the generator speed falls below 95% of nominal, protecting loads from low-frequency operation. The regulator also limits the field current to prevent overheating of the generator rotor.
Installation
This regulator is designed for wall or panel mounting with four screws. All connections are on the front terminal strip, labeled clearly for sensing, field output, and auxiliary inputs. The unit is rated for operation in ambient temperatures of -40°C to +65°C and is humidity protected by conformal coating.
Application Scenarios
Ideal for diesel generator sets in construction, agriculture, and telecom applications, where compactness and reliability are key. It can also be used in marine auxiliary generators and small hydro plants.
Maintenance
With no moving parts and solid-state components, the SSR 125-12 requires minimal upkeep. Visual inspection and cleaning of ventilation slots are recommended annually.
Conclusion
The Basler SSR 125-12 Static Voltage Regulator combines simplicity, affordability, and robust performance, making it an excellent choice for OEMs and retrofit projects.
