Basler Electric SSR 125-12 Static Voltage Regulator 9185900102

The Basler Electric SSR 125‑12 (part number 9185900102) is a solid‑state automatic voltage regulator designed for small to medium synchronous generators up to approximately 125 kVA. It provides tight voltage regulation of ±1% from no‑load to full‑load, ensuring stable power supply to sensitive loads. The regulator is simple to install and adjust, making it a popular choice for standby and portable generator sets.

Regulation and Control

The SSR 125‑12 uses a proportional‑integral control circuit with adjustable stability to accommodate different exciter and generator characteristics. It features a built‑in voltage setpoint potentiometer (90‑110% of nominal), and a stability control for damping. The regulator also includes an under‑frequency protection that reduces excitation when the frequency drops below 45 Hz, preventing motor over‑excitation.

Input and Output

Sensing input is 120‑240 VAC, single‑phase. The excitation output is up to 90 VDC at 12 A continuous, sufficient for most brushless exciters. The regulator derives its power directly from the sensing input, eliminating the need for a separate power supply. A field current monitor terminal allows connection to an external meter.

Protection Features

The SSR 125‑12 includes short‑circuit protection on the field output, over‑voltage clamping, and thermal overload. A red LED indicates a fault condition. The regulator automatically resets after fault clearing. A separate alarm output can be used to drive an external indicator.

Applications

Ideal for diesel generators, gasoline generators, and marine auxiliary sets, this regulator is also used in agricultural pumping, construction power, and telecommunication sites. Its compact size allows installation inside the generator terminal box.

Installation and Adjustment

Mount the regulator on a flat surface using the four mounting holes. Connect the AC sensing wires to the generator output and the field wires to the exciter. Adjust the voltage setpoint with a screwdriver while monitoring the generator output voltage. The stability control is set to achieve a stable response without hunting.

Reliability and Durability

Basler Electric’s SSR 125‑12 is built with high‑quality components and conformal‑coated PCBs to withstand moisture and dust. It operates reliably in ambient temperatures from –40°C to +65°C. With no moving parts, it offers long service life and minimal maintenance.

Conclusion

The Basler Electric SSR 125‑12 static voltage regulator (9185900102) is a dependable, cost‑effective solution for voltage control in small generator applications. Its straightforward design, robust protection, and easy adjustment make it a preferred choice for original equipment manufacturers and end users alike.