4-20mA Signal Splitter | 1 Input, 2 Isolated Outputs | 24V DC Powered | High Accuracy & Fast Response | DIN Rail Mount | ASI451124

The ASI451124 is a DIN rail-mounted 4-20mA signal splitter that accepts one 4-20mA (or 0–10V) analog input and replicates it as two fully galvanically isolated 4-20mA output signals. Powered by 24V DC (±10%) and drawing ≤60mA, the module provides 0.2% full-scale output accuracy at 20°C with a temperature drift of 0.05% FS per 10°C
and a response time of ≤100ms. Dielectric strength is rated at 1500V AC for one minute with insulation resistance of ≥100MΩ at 500V DC. Each output channel can drive a maximum load resistance of ≤300Ω. The compact 17.5mm wide housing (99 × 17.5 × 114mm) mounts to standard 7.5mm or 15mm DIN rail.

Designed for industrial process control, factory automation, and SCADA applications, the ASI451124 allows a single field transmitter to simultaneously drive two independent receiving devices — such as a PLC input card and a panel-mounted indicator — without voltage budget constraints or interference between circuits. Three-way galvanic isolation between the input, each output, and the power supply prevents ground loops and protects connected equipment. The module supports both loop-powered and non-loop-powered sensor connections and includes factory-calibrated Zero and Span adjustments on each output channel for field trimming flexibility.

WHAT DOES THIS PRODUCT DO?
The ASI451124 takes a single incoming 4-20mA signal and produces two separate, galvanically isolated 4-20mA output signals, so one field transmitter can feed two receiving devices at once without those devices interacting electrically.

WHAT PROBLEM DOES THIS SOLVE?
When a 4-20mA transmitter must feed both a PLC and a separate panel meter, recorder, or controller, connecting both receivers in series consumes available compliance voltage and can degrade accuracy or fail outright if the combined load exceeds the transmitter's drive capability. Running separate wiring back to the field transmitter adds cost and complexity. The ASI451124 solves this by accepting the transmitter signal at a single input and delivering two independent, galvanically isolated 4-20mA replica signals, each capable of driving its own receiving device up to 300Ω load. Because the input, outputs, and power circuits are fully isolated from one another, ground potential differences between devices cannot circulate as error currents, and a wiring fault on one output cannot propagate to the other.

KEY FEATURES & BENEFITS
• Splits 1 Input Into 2 Isolated 4-20mA Outputs for two downstream devices
• 0.5% F.S. Output Accuracy at 20°C for reliable signal replication
• Fast Response Time (≤100mS) suited to real-time monitoring and control
• 3-Way Isolation Between Input, Output, and Power Reduces Ground Loops
• Supports Loop-Powered or Non-Loop-Powered Sensor Wiring
• Compact 17.5mm Wide DIN Rail Housing Conserves Panel Space
• Factory-Calibrated Zero and Span Adjustments, Independent Per Output
• Wide Ambient Operating Range: -20°C to +60°C
• Accepts 20-14 AWG Wire for Straightforward Panel Wiring

APPLICATIONS
• Industrial Process Control Panels
• PLC and Remote I/O Signal Distribution
• SCADA Systems
• Factory Automation
• Machine Building / OEM Equipment
• Water and Wastewater Treatment Systems
• Multi-Point Analog Monitoring

WHY CHOOSE THIS PRODUCT?
The ASI451124 gives panel builders and integrators a straightforward way to duplicate a single 4-20mA transmitter signal for two receiving devices without splicing field wiring or risking ground loop interference between them. Isolation between the input, both outputs, and the power supply keeps each circuit electrically independent, protecting sensitive downstream instrumentation.

Its 17.5mm DIN rail footprint keeps panel space use low, and support for both loop-powered and non-loop-powered sensor configurations means the same module can be specified across a range of field device types rather than stocking separate versions for each wiring style.