The CL-6B Control replacement options are designed for CPS voltage regulators - and all domestically manufactured, single-phase, 32-step regulators, regardless of size or capacity. Our universal mounting bracket mounts easily to your existing regulator. The CL-6B control replacement is available in three options. The Control Panel and the PRA fit into your existing Cooper, Siemens, GE, and Howard regulator control boxes. Control Replacement Assembly (CRA) includes control panel, back panel, and box. Panel Replacement Assembly (PRA) includes control panel, factory-assembled with mounting hardware and wiring harness. Control Panel only order the appropriate retrofit kit to install.