Overview
Manuals
Primary Operational Application
Working principle limited
Features:
- Intrinsically Safe (IS) System Power Supply Unit
- Redundant, regulated 12 VDC output bus
- It can be directly plugged into a dedicated Emerson IS system power carrier to distribute logic-side power to adjacent isolation modules
The Emerson KJ4110X1-EA1 12P1878X032 is an intrinsically safe system power module designed for DeltaV distributed control systems (DCS). In hazardous industrial environments such as petrochemical, natural gas, and pharmaceutical plants, it can serve as a core power hub, primarily responsible for converting unstable, wide-voltage DC inputs (18.5 to 36 VDC) into high-precision, clean 12 VDC (5 amps).
As a core electrical barrier separating safe and hazardous areas, this module's circuit design features superior overcurrent, overvoltage, and short-circuit protection, fully meeting the high redundancy requirements of the DeltaV system. The module's front panel is equipped with intuitive hardware LED indicators for seamless integration with the DeltaV control network.
The KJ4110X1-EA1 12P1878X032 Emerson DeltaV System Power Supply Unit may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Emerson KJ4110X1-EA1 12P1878X032 System Power Supply Unit INFO(manual), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
The sole purpose of this module is to provide a highly regulated, electrically isolated, and redundant 12V DC 5A power supply to downstream DeltaV intrinsically safe I/O cards. This module is particularly useful when field instruments (such as temperature sensors, control valves, or NAMUR switches) are located in potentially explosive environments where standard current could trigger an explosion.
Isolation Barrier Power: It powers the local bus logic side of the IS carrier board, ensuring that overvoltages (up to 250V) on the main power supply will not be transmitted to the field lines under any circumstances.
System Redundancy: Two modules are mounted in pairs on the carrier board, using a diode or parallel configuration. If one power supply fails, the backup module immediately takes over the 5A load without interrupting the controller or I/O channels.
The Emerson KJ4110X1-EA1 12P1878X032 operates primarily based on high-frequency switching power supply (SMPS) rectification technology and a stringent intrinsically safe energy limiting mechanism. When the external main power distribution system inputs a conventional 24V (or 18.5-36V) DC power supply to the module, its onboard high-frequency inverter circuit first converts the DC power to high-frequency AC power, then performs physical isolation and voltage reduction through a high-frequency isolation transformer, and finally outputs a highly stable 12VDC voltage through a high-speed rectifier and filter circuit.
During this process, the module's internal special RC and energy limiting networks (such as Zener diode safety barriers and high-speed current-limiting electronic switches) monitor in real time, ensuring that even if an electrical signal output to a hazardous location is accidentally short-circuited or open-circuited at the front-end cable, the released instantaneous electrical spark energy or thermal effect will not ignite surrounding explosive gases.
This achieves a highly safe power supply, forming a closed loop of power conversion, physical isolation, and safe energy limiting.
