ECNT43 B & R Automation
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The ECNT43 is a power supply from B & R Automation and is part of the ECN PLC Power Supplies series. It features a nominal input voltage of 24 VDC and delivers output voltages of +8 V, +15 V, and -30 V with a total power output of 100 W. The unit also has a fuse rating of 10 A at 250 V and includes varistor protection.
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Product Description:
The ECNT43 power module is produced by B&R Automation for the ECN PLC Power Supplies series. It functions as the centralized DC source for I/O racks and controller electronics, distributing multiple regulated rails so peripheral cards can operate from a common supply. In automated assembly lines or packaging equipment, the module converts an external industrial 24 V bus into stabilized voltages that keep logic sections and field relays within their intended operating ranges. Mounting the module on the same DIN rail as the CPU simplifies wiring and reduces the number of discrete converters required.
The unit is designed for a nominal input of 24 VDC, and it tolerates input voltages from 18 V to 32 V without losing regulation. Inrush energy is buffered by an internal storage bank that provides 6000 µF of input capacitance, while an additional single-phase bridge reservoir rated at 6800 µF and 35 V filters rectified power. Continuous current draw should not exceed 7 A. A replaceable 10 A, 250 V, slow-blow fuse protects upstream cabling against fault currents. When fully loaded, the converter can deliver a total output of 100 W. Overvoltage spikes at the input are clamped by a varistor to protect downstream circuits from damaging transients.
The module feeds three secondary rails rated at +8 V, +15 V, and -30 V, which supply analog sensors, digital logic, and negative-bias components, respectively. Relay contacts associated with these circuits can switch up to 2000 VA of apparent load or a resistive load of 150 W. Electrical isolation is maintained by a dielectric strength of 4000 Vrms between the relay coils and contacts. The insulation also withstands transient events up to 250 Vrms without breaking down. The available capacitance provides short-term energy storage during brief input voltage drops, helping the connected control electronics remain stable. The fuse interrupts sustained fault current, while the varistor limits short voltage surges before they can reach the secondary power rails.
