The SR4A Retrofit Voltage Regulator is an economical, direct replacement

for existing Basler Electric SR4A voltage regulators. Designed for brush

and brushless synchronous generators, it delivers accurate voltage

regulation, dependable excitation control, and fast response times while

fitting within the same mounting footprint as the original regulator. 

The retrofit package incorporates a modern AVC63-12 voltage regulator

and, where required, an internal sensing module, making installation

quick and straightforward.

Engineered for reliable operation in demanding power generation

environments, the SR4A Retrofit supports single- or three-phase sensing,

reactive droop compensation, line drop compensation, underfrequency

protection, and integration with power factor controllers, excitation limiters,

and auto synchronizers. Its rugged construction, ease of installation, and

compatibility with existing generator systems make it an ideal solution for

extending equipment life and improving voltage regulation performance.

The SR and SSR Retrofit Voltage Regulators are designed as economical,

direct replacement solutions for legacy Basler SR and SSR voltage regulators.

Engineered for quick installation, these retrofit kits fit into the existing

mounting space and utilize terminal-to-terminal wiring to simplify field

replacement. Integrated CT input burden matching supports paralleling

systems with cross-current compensation, while accessory inputs provide

compatibility with var/power factor controllers and excitation limiters.

The SR and SSR Retrofit series delivers the same dependable performance

as the original regulators while helping extend the life and reliability of

generator excitation systems.