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Alstom MAE99-04
Alstom MAE99-04

ABB M4A-AT

Product Introduction:​
The ABB M4A-AT is part of ABB’s M4 panel-mounted analog measurement and monitoring family, often used as a programmable transducer or annunciator in switchgear and control panels. It accepts AC/DC analog inputs (current/voltage) and provides scaled outputs, setpoint alarms, or display functions depending on configuration.
Category:
Description
Typical Specifications (representative):
  • Manufacturer:​ ABB (Control Products / Installation Materials Division)
  • Series:​ M4 (M4A = Analog version)
  • Input Signals:​ Programmable — AC/DC current (0–1 A / 0–5 A) or voltage (0–10 V / 0–100 V / 0–500 V AC)
  • Auxiliary Supply:​ 24 VDC / 110–240 VAC (model-dependent)
  • Outputs:​ Scaled analog retransmission (4–20 mA / 0–10 V) — on -AT variants; optional alarm relays
  • Display:​ 3½ digit LED or bargraph (depending on model)
  • Accuracy:​ ±0.5% of reading
  • Operating Temp:​ –10 °C to +55 °C
  • Mounting:​ Panel cutout (96×48 mm DIN 43700 standard for M4 series)
  • Protection:​ Front panel IP54; rear IP20
  • Certifications:​ CE, UL recognized
Functional Features:
  • Programmable scaling, alarm setpoints, hysteresis
  • True RMS measurement for AC inputs
  • Password-protected parameter setup via front keys
Application Scenarios:
  • Generator / transformer analog monitoring in MV switchgear
  • Motor control center (MCC) current/voltage display & alarm
  • Retrofit analog metering in legacy panels
Installation & Notes:
  • Verify CT/PT ratios are correctly programmed during commissioning
  • Use screened cable for low-level analog inputs
  • Observe segregation of analog and digital/AC power wiring
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