Replacement control circuit board compatible with MasterTemp 200 250 300 400 400HD and StaRite MaxETherm SR200NA SR333NA SE400NA SR200HD SR333HD SR400HD control boards. Key benefits Reliable electrical insulation: quality substrate material provides strong dielectric performance to reduce the risk of leakage between circuit zones. Durable construction: Robust mechanical strength and heat resistance help the board withstand typical operating stresses in heating control systems. Efficient power transmission: Low impedance design minimizes energy loss and voltage drop during current flow, supporting stable circuit operation. Improved circuit protection: Effective isolation of separate circuit areas reduces the chance of short circuits and electrical faults, even under voltage or humid conditions. Direct compatibility: Designed as a replacement for the listed control board models, maintaining original form and function. What it does Functions as the main control circuit board in compatible pool and heater control units, providing signal routing, isolation, and reliable electrical connections required for normal operation. Material and performance highlights Substrate: quality material chosen for insulation, mechanical integrity, and thermal tolerance. Electrical: Low impedance to reduce losses and preserve consistent voltage across components. Environmental resilience: Maintains insulation and isolation performance in conditions involving elevated voltage or humidity. Typical use scenarios : a failed control board in a compatible pool heater after electrical damage or component failure to restore normal operation. Preventive maintenance: Swap an aging board showing intermittent faults or degraded performance to improve system reliability. Service and refurbishment: Use when rebuilding or refurbishing compatible heating control units to ensure consistent electrical behavior and reduce future failures. Compatibility Fits MasterTemp 200, 250, 300, 400, 400HD control boards and StaRite MaxETherm SR200NA, SR333NA, SE400NA, SR200HD, SR333HD, SR400HD control boards. Note Intended as a direct replacement part for the listed models. Verify model numbers before to ensure proper fit and function.