Basler Electric SR4A-2B15B3A – Static Voltage Regulator for 120 V Systems

The Basler Electric SR4A-2B15B3A is a rugged static voltage regulator designed for generators with 120 V AC sensing. It provides a continuous output current of 15 A, making it suitable for alternators in the 150–800 kVA range. This regulator combines Basler’s proven solid‑state technology with flexible adjustment features, delivering reliable voltage control for industrial, marine, and standby applications.

Key Features

The regulator uses a PWM power stage for high efficiency and low harmonic distortion. Voltage setpoint, stability, and droop are all field‑adjustable via front‑panel trimpots. Under‑frequency roll‑off protects against overvoltage during overspeed, while over‑excitation limiting safeguards the field winding. An optional remote voltage adjustment input provides additional operational flexibility.

• Input sensing: 120 V AC ±10%, 50/60 Hz

• Output current: 15 A continuous (20 A surge)

• Output voltage: up to 150 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, fault

• Mounting: panel or chassis with heat sink

• Operating temperature: –20 °C to +60 °C

Applications

This regulator is commonly used in generator sets for data centres, hospitals, and industrial facilities. Its robust output stage supports both brushless and static excitation systems, providing stable voltage for motor starting and nonlinear loads.

Installation and Maintenance

Mounting is straightforward with four screws, and all connections are made through pluggable terminal blocks. The regulator requires minimal maintenance; periodic inspection of connections and cooling fins is recommended.

Durability and Compliance

Built with industrial‑grade components and conformal‑coated boards, the SR4A-2B15B3A withstands harsh environments. It complies with CE and RoHS standards, ensuring safe and reliable operation.

In summary, the Basler Electric SR4A‑2B15B3A static voltage regulator delivers high‑current excitation control with precision and reliability, making it a versatile solution for a wide range of generator applications.