Basler Electric SR4A1B07B3A – Solid‑State Static Voltage Regulator
The Basler Electric SR4A1B07B3A is a robust static voltage regulator engineered to provide precise excitation control for synchronous generators. With a continuous output current rating of 7 A, this regulator is well‑suited for medium‑sized alternators in industrial plants, marine installations, and standby power systems. Its solid‑state design ensures high reliability, fast transient response, and minimal maintenance.
Regulation and Control Features
The SR4A1B07B3A employs a pulse‑width modulated (PWM) power stage that delivers high efficiency and low harmonic distortion. The regulator continuously compares the generator terminal voltage with an adjustable reference and modulates the field current to maintain the setpoint within ±0.5% accuracy. Key adjustments include voltage setpoint (90–110% of nominal), stability control for matching generator dynamics, and droop compensation for parallel operation. Under‑frequency roll‑off protects the generator from overvoltage during overspeed conditions.
Input sensing: 120/240 V AC, 50/60 Hz
Output current: 7 A continuous (10 A surge)
Output voltage: up to 90 V DC
Regulation accuracy: ±0.5% of setpoint
Voltage adjustment range: ±10%
Droop adjustment: 0–5% for paralleling
Under‑frequency roll‑off: adjustable 45–60 Hz
Protections: over‑excitation limiting, loss of sensing, short circuit
LED indicators: power, regulation, and fault status
Mounting: panel or chassis with integral heat sink
Operating temperature: –20 °C to +60 °C
Typical Applications
This regulator is ideal for generator sets ranging from 50 kVA to 400 kVA, commonly found in data centres, hospitals, manufacturing facilities, and marine vessels. Its robust output stage supports both brushless and static excitation systems, providing dependable voltage support for motor starting and nonlinear loads.
Installation and Field Configuration
Mounting is straightforward using pre‑drilled holes, and all electrical connections are made via clearly labelled, pluggable terminal blocks. Front‑accessible trimpots allow rapid commissioning without specialised tools. An optional remote voltage adjustment input enables fine‑tuning from a control panel.
Durability and Compliance
Constructed with industrial‑grade semiconductors and conformal‑coated circuit boards, the SR4A1B07B3A withstands moisture, dust, and vibration. It complies with IEEE C37.90 and IEC 60255 standards, ensuring reliable performance over its extended service life.
In summary, the Basler Electric SR4A1B07B3A static voltage regulator combines precise control, robust construction, and flexible adjustment, making it a dependable solution for generator voltage regulation.
