Schneider Electric / Eurotherm 025451 900 EPC PSU Board

The Schneider Electric/Eurotherm 025451 900 EPC PSU Board is a dedicated power supply unit for Eurotherm 900 series controllers and associated modules. It delivers stable, reliable power to industrial process control systems managing temperature, pressure, and flow applications. This board forms part of the Eurotherm 900 EPC Programmer Controllers range, engineered for high stability and accuracy across diverse environmental and operational conditions.

Technical Specifications

• Up to 4 isolated control outputs supporting multiple output types


• Triac outputs: 264V, 0.75A maximum into resistive load; 85V RMS minimum; 2 mA leakage at 264V AC 50 Hz


• Logic outputs: 20 mA at 18V minimum


• Relay outputs: 264V, 2A maximum (3A for paired configuration) into resistive load with spark suppression; 50V RMS or 24V DC minimum switching voltage; 2 mA leakage at 264V AC 50 Hz


• On/off and time proportional operation modes Alarm Capabilities


• Up to 8 isolated relay alarms with 264V, 2A rating (3A paired); 50V RMS or 24V DC minimum switching voltage


• Hysteresis: 0.1% to 50% of parameter span


• Alarm types: Full Scale High/Low, Deviation High/Low, Band High/Low, Rate of Change of PV and Output, Sensor Break, and custom parameter/controller failure detection


• Alarms configurable across complete instrument range Programmer Functions


• Maximum 20 separate programs (50 in programmer plus variant)


• Up to 450 program segments with free-format allocation


• Ramp rate: 0.01°C/hr resolution; settable per hour, minute, or second (one display unit to span)


• Dwell time: Hours (9999.9), minutes (9999.9), or seconds (9999.9) Input Processing


• Thermocouple standards: BS4937(1973), DIN43710, ASTM E230(1972)


• Thermocouple linearization accuracy: ±0.2°C


• Cold junction compensation: Internal or external, 0–100°C variable range

Key Features

• Multiple isolated control and alarm outputs for flexible system configuration


• Precision thermocouple input linearization and CJC support


• Extensive programming capability with 450-segment capacity


• Wide voltage switching range accommodates AC and DC loads

Typical Applications Industrial process control systems requiring multi-output control, alarm management, and programmable temperature profiling across manufacturing, thermal processing, and laboratory environments.

Compatibility & Integration Designed for integration with Eurotherm 900 series controllers and EPC Programmer Controllers. Supports isolated relay, triac, and logic outputs for direct load control and alarm signaling.