Basler Electric SR4A-2B05A3E – Compact Static Voltage Regulator
The Basler Electric SR4A-2B05A3E (also designated SR4A2B05A3E) is a reliable static voltage regulator designed for small to medium‑sized synchronous generators. It provides precise, stable excitation control with adjustable voltage setpoint, stability, and under‑frequency compensation, making it a versatile choice for a wide range of power generation applications.
Regulation Features
This regulator utilises a solid‑state PWM power stage to achieve high efficiency and low heat dissipation. The sensing circuit accepts 120/240 V AC inputs and delivers a regulated DC output to the generator field. The SR4A-2B05A3E includes an adjustable voltage reference (90–110% of nominal), a stability trimpot to match generator dynamics, and an under‑frequency roll‑off function that reduces excitation during overspeed, preventing overvoltage.
Input sensing: 120/240 V AC, 50/60 Hz
Output current: 5 A continuous (7 A surge)
Output voltage: up to 90 V DC
Regulation accuracy: ±0.5% of setpoint
Voltage adjustment: ±10%
Stability adjustment: continuous trimpot
Under‑frequency roll‑off: adjustable 45–60 Hz
Protections: over‑excitation limiting, short circuit
LED indicators: power and regulation status
Mounting: panel or chassis, with heat sink
Operating temperature: –20 °C to +60 °C
Applications
This regulator is ideal for generator sets up to 500 kVA in industrial plants, marine vessels, construction sites, and backup power systems. Its simple design and proven reliability make it a popular choice for OEMs and retrofits.
Installation and Calibration
Mounting is quick with four screws, and all connections are made via screw terminals. Two trimpots—voltage and stability—allow straightforward field tuning. The regulator also supports remote voltage adjustment via an external potentiometer.
Durability and Compliance
Built with high‑grade components and conformal coating, the SR4A-2B05A3E withstands moisture, dust, and vibration. It complies with CE and RoHS standards, ensuring environmental safety and long‑term reliability.
In summary, the Basler Electric SR4A‑2B05A3E static voltage regulator offers robust, accurate excitation control in a compact package, making it a dependable solution for diverse generator applications.
