Eaton MTL4541AS

Product Name:​ MTL4500 Series 4/20 mA Passive Input Isolator / Current Repeater with HART® Passthrough (Sinking Version)
  • Brief Introduction:​ An intrinsically safe (IS) galvanic isolator barrier that accepts a 4–20 mA signal from a 2- or 3-wire transmitter located in a hazardous area (Zone 0/Div.1) and repeats it as a 4–20 mA output in the safe area. The “AS” variant acts as a current sink rather than sourcing into the safe-area load. Supports bidirectional HART digital communication superimposed on the analog loop.
Category:
Description
  • Technical Specifications:
    • Channels:​ 1 (single channel)
    • Hazardous-Area Input:​ 4–20 mA (under/overrange 1–21.5 mA); terminals 1–2
    • Input Impedance (for HART):​ > 230 Ω
    • Safe-Area Output:​ 4–20 mA passive (current sinking); load resistance typically ≤ 600 Ω
    • Supply Voltage (Safe Side):​ 20–35 V DC (typically 24 V DC from backplane/power bus)
    • Power Dissipation (unit internal):​ approx. 1.1 W @ 24 V DC, 20 mA signal
    • Safety Parameters (IS side):​ Uo ≤ 28 V, Io ≤ 93 mA, Po ≤ 0.65 W; Um = 253 V rms
    • Hazardous Area Certification:​ ATEX / IECEx Ex ia IIC T4–T6; FM / CSA Div. 1 Groups A–D
    • SIL Rating:​ SIL 2 capable (HFT=0), SIL 3 in redundant configuration (HFT≥1) per IEC 61508
    • Mounting:​ 16 mm or 22.5 mm DIN rail (MTL4500 series housing)
  • Features:​ HART protocol transparent; LED indicators on some variants; high noise immunity; galvanic isolation between HA and SA sides.
  • Applications:​ Connecting IS-located 4–20 mA transmitters (pressure, temp., flow) in petrochemical, oil & gas, pharmaceutical plants to DCS/PLC analog input cards.
  • Installation Notes:​ Install in safe area only (Zone 2 / non-hazardous); verify IS calculation (loop approval) before commissioning; do not mix IS and non-IS wiring in same termination block; observe polarity on HA terminals 1(+), 2(–).
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