A. Product Overview

The Autonics MT4W-AA-41 AC Ammeter Digital Panel Meter belongs to the Autonics MT4W series of multi-panel meters. It is primarily designed to monitor AC current while also supporting frequency measurement.

The meter uses a clear 4-digit 7-segment LED display with a character height of approximately 14.2 mm, allowing operators to easily view measurement values from the front of a control panel.

It supports several AC current input ranges, including:

0 to 5 A
0 to 2.5 A
0 to 1 A
0 to 500 mA
0 to 250 mA
0 to 100 mA
0 to 50 mA

The MT4W-AA-41 can perform both average value and RMS measurement depending on configuration. It also includes HI, GO and LO relay outputs, allowing the meter to perform basic monitoring and alarm functions based on preset current limits.

Key Features

Brand: Autonics
Model: MT4W-AA-41
Product Type: Digital Panel Meter and AC Ammeter
Measurement: AC Current and Frequency
Display: 4-digit 7-segment LED
Maximum Display Range: minus 1999 to 9999
Maximum AC Current Input: 5 A
Power Supply: 100 to 240 VAC, 50 or 60 Hz
Main Output: HI, GO and LO relay outputs
Sampling Cycle: Approximately 16.6 ms
Mounting: Panel Mount
Panel Size: Approximately 96 x 48 mm
Panel Cutout: Approximately 92 x 45 mm
Protection: IP56 front protection
Operating Temperature: minus 10°C to 50°C

B. Working Principle

The Autonics MT4W-AA-41 digital AC ammeter receives an AC current signal from the electrical circuit being monitored.

The meter converts the incoming analog electrical signal into digital measurement data using its internal analog-to-digital conversion system.

The measured current value is then displayed on the 4-digit LED display.

For example, if the MT4W-AA-41 is configured for a 0 to 5 A input and the measured current is 3.2 A, the panel meter processes the signal and displays the corresponding current value.

The user can also configure preset limits.

For example:

HI: 4.5 A
GO: Normal operating range
LO: 1.0 A

If the measured current exceeds or falls below the configured limits, the corresponding relay output can operate. This allows the meter to be connected with alarms, contactors, PLC inputs or other control devices.

The meter can also display AC frequency when configured for frequency measurement.

C. Why Is the Autonics MT4W-AA-41 Used?

The MT4W-AA-41 is used when operators need a clear digital indication of AC current inside an electrical or automation panel.

Compared with a basic analog ammeter, a digital panel meter provides easier reading, better monitoring capability and configurable alarm outputs.

It can be used for:

AC current monitoring:
Monitor electrical current drawn by motors, heaters, machines and other AC loads.

Electrical panel indication:
Provide operators with a clear current reading directly on the control panel.

Overcurrent monitoring:
Configure a high limit so that the relay operates when current exceeds a specified value.

Low current monitoring:
Detect situations where current consumption falls below the required operating level.

Machine monitoring:
Monitor the electrical load of motors, pumps, fans, compressors and production machines.

Frequency measurement:
Display the frequency of the connected AC signal when frequency mode is selected.

Automation systems:
Use the HI, GO and LO relay outputs as signals for alarms, interlocks or control logic.

D. Suitable Buyers

The Autonics MT4W-AA-41 AC Ammeter Digital Panel Meter is suitable for:

Electrical Panel Builders

Useful for control panels, MCC panels, distribution panels and machine control panels where digital AC current indication is required.

Industrial Automation Companies

Suitable for automation systems requiring AC current monitoring along with relay-based limit indication.

Machine Manufacturers

OEM manufacturers can install the meter in machinery to display electrical load and monitor current conditions.

Motor Control Panel Manufacturers

Useful for monitoring motor current in pumps, compressors, blowers, conveyors, fans and industrial machinery.

Maintenance Departments

Plant maintenance teams can use digital current indication to identify abnormal electrical loads and operating conditions.

System Integrators

Automation and electrical system integrators can use the MT4W-AA-41 where current measurement and configurable relay outputs are required.

Process Industries

Suitable for factories and process plants where operators need continuous AC current monitoring from the front panel.

HVAC and Utility Panels

Can be used for monitoring fans, blowers, pumps, compressors and other electrical equipment used in HVAC and utility systems.

Frequently Asked Questions

1. What is the Autonics MT4W-AA-41?

The Autonics MT4W-AA-41 is a 4-digit digital panel meter designed mainly for measuring AC current and frequency in industrial electrical panels.

2. What is the maximum current input of the MT4W-AA-41?

The meter supports AC current measurement up to 5 A.

3. What current ranges are supported?

The MT4W-AA-41 supports multiple ranges including 0 to 50 mA, 0 to 100 mA, 0 to 250 mA, 0 to 500 mA, 0 to 1 A, 0 to 2.5 A and 0 to 5 A.

4. Can the MT4W-AA-41 measure frequency?

Yes. The Autonics MT4W-AA-41 can measure and display AC frequency in addition to AC current.

5. What is the power supply of the MT4W-AA-41?

The meter operates on a 100 to 240 VAC, 50 or 60 Hz power supply.

6. Does the MT4W-AA-41 have relay outputs?

Yes. The model provides HI, GO and LO relay outputs for comparative value monitoring.

7. What are HI, GO and LO outputs?

HI indicates that the measured value is above the configured high limit. LO indicates that the value is below the configured low limit. GO indicates that the measured value is within the selected acceptable range.

8. Can the relay output be used for an alarm?

Yes. The relay outputs can be connected to suitable external alarm circuits, PLC inputs, indicator lamps or control systems according to the application and electrical design.

9. What is the display type?

The MT4W-AA-41 uses a 4-digit 7-segment LED display with approximately 14.2 mm character height.

10. What is the panel size?

The meter is approximately 96 x 48 mm, making it suitable for standard industrial panel mounting.