Image not available
Illustrative purposes only
APM-MAX-M21-NU-4B
Panel Meter, Current/Frequency/Power/Voltage/PF, 4 Digits and Graph, 240 V, Negative LCD, TCP/IP/RTU
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: TRUMETER
- Product type: Digital Panel Meters
- SVHC: No SVHC (04-Feb-2026)
- Meter Range: 0VAC to 600VAC / 0VDC to 600VDC / 0mVDC to 500mVDC / 0A to 5A / 0Hz to 400Hz
- Digit Height: 14.5mm
- Product Range: APM-MAX Series
- Meter Function: Current, Frequency, Power, Voltage
- Panel Cutout Width: 68mm
- Supply Voltage Max: 240VAC
- Supply Voltage Min: 100VAC
- Panel Cutout Height: 68mm
- No. of Digits / Alpha: 4
- Operating Temperature Max: 60°C
- Operating Temperature Min: -10°C
| Delivery and price | |
|---|---|
| Units per pack | 1 |
| Price | 209.3 € |
| Current stock | 10+ |
| Lead time | 30 days |
## **APM-** MAX ## **M21 and M23** **==> picture [542 x 438] intentionally omitted <==** **----- Start of picture text -----**<br> M21 and M23 EVALUATION KIT AVAILABLE Contact us to request yours<br>e@ 3 x<br>16 million colors<br>Programmable RGB backlight<br>for user alerts.<br>60<br>Segment curved<br>bar graph display Programmable scale<br>(=) ge oS<br>Combined digital and<br>bar graph display<br>2<br>Alarm set points<br>Programmable 4 digit Modbus [®]<br>starburst display. Custom RTU/TCP/IP Connectivity<br>messages & annunciators<br>PLC =. _spaggil t Qc sr s<br>(HLLmn Ce U USB port for custom user settings » —<br>via the free easy-to-use software<br>2 digital outputs<br>1 analog output<br>108mm x 108mm;<br>only 64mm deep<br>and fits in 4”<br>Selectable to measure diameter circular<br>cutout<br>. WIDE age VOLT voltage, current, |<br>frequency or watts<br>Full 4 digit readout for<br>accuracy<br>E<br>RA<br>E Y<br>R<br>E<br>N<br>R<br>A<br>A<br>T<br>H<br>W Y<br>T R<br>**----- End of picture text -----**<br> **Designed for a wide range of power monitoring applications, the APM-MAX combines the instant visual representation of an analog meter with the speed and accuracy of a digital meter for instant recognition and precision measurement. The large 81.5mm x 66mm display features a two-line display, programmable scale, alarm set-points and colorchanging, full color RGB backlight for instant alerts.** **APM-MAX-M21:** for high voltage applications; configurable as an ammeter, volt meter, frequency meter or power monitor (Watts, VA & Power Factor). **APM-MAX-M23:** for low voltage applications; configurable as a process meter or to be used in conjunction with a shunt. Both models feature digital and analog outputs and serial MODBUS[®] RTU as standard (ethernet MODBUS[® ] also available) for communication with other components in a system as well as an IP65 rating and our industry leading three-year warranty. **Go to www.trumeter.com/apm for further information** ## Specifications ## Large multi-format display that incorporates: - 60 segment bar graph display ## **MEASUREMENT** Input range (V1) Current Input range (Direct) Current Input range (w/shunt) Frequency (AC) Power Measurement Accuracy (Frequency) Accuracy (Voltage) Display modes ## **ENVIRONMENTAL** Temperature - operating Temperature - storage IP rating (from the front) ## **M21** 0-600V DC/AC 47-63Hz 0–5A DC/AC 45-65Hz 0-500mV DC/AC 45-65Hz 0–400Hz Watts, VA & Power Factor 0.1% 0.5% RMS -10 to +60°C -40 to +70°C IP65 ## **M23** 0–10V DC 0–50mA DC 0-500mV DC 0–400Hz - - Large 4 digit display - Separate Starburst display area for annunciators, custom messages and alarm info - Full color RGB dynamic backlight for user alerts ## Programmable: - Scaling and Range (min and max) - Custom annunciators - User selectable backlight color and intensity - Two independent alarm set-points - Two independent outputs - 4-20mA analog monitor output ## Visibility: - The largest display of any APM - User adjustable RGB backlight provides an almost infinite range of colors for different requirements or environmental conditions. - Wide viewing angle (both horizontal and vertical) - Custom annunciators **POWER SUPPLY** Universal (AC) Low Voltage (DC) 100–240V AC (50-60Hz) 12-24V DC (50-60Hz AC) **DISPLAY** Number of digits 4 Digit height 14.5mm [0.57”] Digit height of annunciator 6.8mm [0.27”] Number of message characters 4 Full RGB backlight and White Positive or Negative Backlight colors LCD display ## Part Numbers ## **Standard Models - Modbus RTU** **APM-MAX-M21-PU-4R** Positive LCD, volt, amp, freq or power monitor, RTU **APM-MAX-M23-PU-4R** Positive LCD, process or shunt meter, RTU **APM-MAX-M21-NU-4R** Negative LCD, volt, amp, freq or power monitor, RTU **APM-MAX-M23-NU-4R** Negative LCD, process or shunt meter, RTU **APM-MAX-M21-PL-4R** Positive LCD, low voltage, volt, amp, freq or power monitor, RTU **APM-MAX-M23-PL-4R** Positive LCD, low voltage, process or shunt meter, RTU **APM-MAX-M21-NL-4R** Negative LCD, low voltage, volt, amp, freq or power monitor, RTU **APM-MAX-M23-NL-4R** Negative LCD, low voltage, process or shunt meter, RTU ## **OUTPUTS** ## **Standard Models - Modbus TCP/IP and RTU** Max voltage 34V Max current 500mA Analog output 4-20mA or 0-10V **COMMUNICATION** Modbus[®] RTU and/or TCP/IP **CERTIFICATION** UL and cUL, CE, UKCA **APM-MAX-M21-PU-4B** Positive LCD, volt, amp, freq or power monitor, TCP/IP and RTU **APM-MAX-M23-PU-4B** Positive LCD, process or shunt meter, TCP/IP and RTU **APM-MAX-M21-NU-4B** Negative LCD, volt, amp, freq or power monitor, TCP/IP and RTU **APM-MAX-M23-NU-4B** Negative LCD, process or shunt meter, TCP/IP and RTU **APM-MAX-M21-PL-4B** Positive LCD, low voltage, volt, amp, freq or power monitor, TCP/IP and RTU **APM-MAX-M23-PL-4B** Positive LCD, low voltage, process or shunt meter, TCP/IP and RTU **APM-MAX-M21-NL-4B** Negative LCD, low voltage, volt, amp, freq or power monitor, TCP/IP and RTU **APM-MAX-M23-NL-4B** Negative LCD, low voltage, process or shunt meter, TCP/IP and RTU Dimensions: **==> picture [241 x 96] intentionally omitted <==** **----- Start of picture text -----**<br> 3.210 2.541 3.376<br>81.5 64.5 85.7<br>4.269 1.756<br>108.4 44.60<br>Panel cutout: Square: 68mm x 68mm [2.7” x 2.7”] Circle Diameter: 96mm [3.8”]<br>4.269 108.4 2.596 65.9 3.376 85.7<br>**----- End of picture text -----**<br> ## **Options** |**Options**||| |---|---|---| |**DESCRIPTOR**|**DEFINITION**|**OPTIONS**| |-**?**X-XX|LCD Type|P - Positive| |||N - Negative LCD also available| |-X**?**-XX|PSU Type|U – Universal 100–240V AC 50-60Hz| |||L – Low Voltage 12-24V DC / 50-60Hz AC| |-XX-**?**X|Analog Output|4 – 4 to 20mA / 0 – 20mA switchable| |||_1 - 0 to 10V DC also available*_| |-XX-X**?**|Communications|R – Modbus®RTU| |||B – Modbus®TCP/IP and Modbus®RTU| |**024569-21**|**024569-21**MAX Meter Evaluation Kit|MAX Meter Evaluation Kit| **Trumeter (The Americas) Trumeter (Europe)** 6601 Lyons Rd, Suite H-7 Pilot Mill Coconut Creek, Florida Alfred Street FL 33073, Bury, USA BL9 9JR Tel: +1 954 725 6699 Tel: +44 161 674 0960 Email: sales.usa@trumeter.com Email: sales.uk@trumeter.com **Innovative Design Technologies Sdn. Bhd** Lot 5881, Lorong Iks Bukit Minyak 1 Taman Perindustrian Iks, 14000 Bukit Tengah Penang, Malaysia Web: www.idtworld.com Tel: + 604 5015700 Email: sales.my@idtworld.com **www.trumeter.com** APM-MAX-DS-v.2.6 2/2023
Updated at June 9, 2026
About Novapart
Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 410,000+ components from 500+ manufacturers.
Learn more →Stock Shortage Specialist
When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.
Request a quote →Compliant Alternatives
We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.
BOM Analysis service →