ABB ESM500-9999 Current Transducer — 500 A AC/DC Measurement with 4-20 mA Output

ABB ESM Series · Closed-Loop Hall-Effect Transducer · Panel / DIN-Rail Mount

The ABB ESM500-9999 is a closed-loop Hall-effect current transducer rated for primary currents up to 500 A, with an analogue 4-20 mA (or 0-10 V, depending on variant) output proportional to the measured AC or DC primary current. It is part of ABB's ESM family of panel-mount measurement devices, used in motor control centres, sub-metering cabinets, and process-power monitoring where a PLC or SCADA system needs an accurate, isolated current feedback that is galvanically separated from the power circuit.

At koeed.com we list the ESM500-9999 as a process-power measurement transducer. It is typically wired into an Allen-Bradley MicroLogix / CompactLogix analogue input, a Siemens ET 200SP AI module, or a Schneider Modicon TM3 analogue card, where the current loop is read as a scaled engineering value (A or kW) by the line PLC and surfaced on the HMI as a real-time load profile.

Key Specifications

Datasheet Highlights

• Closed-loop Hall-effect design gives excellent linearity and low temperature drift — important for energy-management applications where a 1 % error compounds into a 10 % billing error over a year.
• True AC + DC measurement (the same transducer handles rectified DC busses, battery currents, and variable-frequency inverter outputs).
• Galvanic isolation between primary power and the 4-20 mA loop protects the PLC analogue input from common-mode voltages and transients on the power conductor.
• Loop-powered 24 VDC operation means the same cabinet 24 VDC bus that feeds the PLC I/O can power the transducer — no separate aux supply needed.
• Wide primary window accepts large cables or busbars without re-termination — useful when the transducer is retrofitted into an existing MCC.
• Output scales directly into engineering units (A, kW), so the PLC scaling block is a single linear map from 4-20 mA → 0–500 A.

Typical Applications

• Motor load monitoring: closed-loop current feedback on large 3-phase induction motors, with the analogue signal wired into a PLC for load profile and overload pre-warning.
• DC bus measurement: battery, capacitor, or DC-link current on DC microgrids, EV charging stations, and solar inverters.
• Sub-metering & energy monitoring: branch-circuit current on a factory floor, with data logged into a SCADA package for ISO 50001 energy reviews.
• Welding & heat-treatment: welding-current feedback on resistance welding machines, where the transducer output is logged for weld-quality records.
• Process heating: heater-element current on electric furnaces and induction heaters, with a PLC interlock that drops the heater on loss of feedback.
• Plating & electrolysis lines: tank-current feedback on plating cells, with the loop powering a dosing controller that adjusts rectifier output.

Related Modules & Cross-Reference

A transducer swap is a good time to verify the matching PLC analogue card and the loop-power supply. KOEED can ship the ESM500-9999 with the AI module and the 24 VDC supply in one consignment:

Browse the KOEED sensors & measurement and PLC modules collections to bundle a full metering kit.

Warranty & Authenticity

Each ESM500-9999 is supplied as a brand-new, factory-sealed ABB ESM-series transducer. KOEED sources from authorised European and US distribution, and counterfeits / remarked devices are rejected at incoming inspection. A 12-month limited warranty covers manufacturing defects; KOEED handles return shipping and replacement from local stock at no charge.

Cross-reference: ESM500-9999 · ABB ESM current transducer · 500 A Hall-effect · 4-20 mA loop-powered · B2B industrial automation spares. KOEED Automation — independent distributor of industrial automation spare parts, including Allen-Bradley, Siemens, Mitsubishi, Omron, Schneider Electric, FANUC, Yaskawa, Panasonic, and Keyence.