M850-LTHN-RS-PO

Digital Panel Meter, Backlight LCD, Multifunction, Current, Voltage, Frequency, Power, Energy,

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: HOBUT
Product type: Digital Panel Meters
No. of Digits / Alpha:-; Meter Function:Current, Voltage, Frequency, Power, Energy; Meter Range:-; Digit Height:-; Panel Cutout Height:92mm; Panel Cutout Width:92mm; Supply Voltage Min:2
SVHC: No SVHC (25-Jun-2025)
Meter Range: -
Digit Height: -
Product Range: -
Meter Function: Current, Voltage, Frequency, Power, Energy
Panel Cutout Width: 92mm
Supply Voltage Max: 330V
Supply Voltage Min: 28V
Panel Cutout Height: 92mm
No. of Digits / Alpha: -
Operating Temperature Max: 70°C
Operating Temperature Min: -20°C

Delivery and price
Units per pack	1
Price	104.04 €
Current stock	10+
Lead time	30 days

Datasheet

## **M850-LTHN POWER METERS** 

## **DESCRIPTION** 

The new range of Hobut power meters feature 96 x 96mm moulded cases and selectable three colour backlight LCD screens. The range is easy to use, features user-programmable CT & VT ratios, and can be used on any single or 3 phase system with any input voltage without re-programming. 

## **APPLICATION** 

The range is a cost effective replacement for traditional panel meters and is suitable for low, medium and high voltage control panels, gensets, building management systems, power management and more. 

**The user can select the colour screen preferred, either blue, green or white** 

## **RANGE** 

## **STANDARD FUNCTIONS:** 

|**STANDARD FUNCTIONS:**||
|---|---|
|Phase Voltage (V)|Instantaneous Amp Demand|
|Phase to Neutral Voltage (V)|Instantaneous Watt Demand|
|Phase Current (I)|Instantaneous VA Demand|
|Frequency (Hz)<br>Active Power (W)|Maximum Amp Demand<br>Maximum Watt Demand|
|Active Energy (kWh)|Maximum VA Demand|
|Reactive Power (VAr)|Neutral Current|
|Apparent Power (VA)|THD Current|
|Reactive Energy (VArh)|THD Voltage|
|Power Factor (PF)||



## **PROGRAMMABLE FUNCTIONS** 

|All models feature the|• AC or DC AUX|
|---|---|
|following user-programmable<br>functions:|• Single or 3 phase system<br>• Input voltage range 28-570V|
|• Selectable Screen Colour|• RS485 address, 1-247|
|• Current Transformer Ratio|• Security code access for|
|• Voltage Transformer Ratio|programming|
|• Baud Rate, Parity, Stops||



## **ORDERING INFORMATION** 

|**M850-LTHN**||~~**RS-PO**~~||~~**1**~~||~~**D**~~||~~**MV**~~||~~**BAC**~~|~~**BAC**~~|
|---|---|---|---|---|---|---|---|---|---|---|---|
|||~~**RS-PO**~~||~~**1**~~||~~**D**~~||~~**MV**~~||~~**BAC**~~||
|||||||||||||



## **CONTROLS AND PROGRAMMING** 

**CONTROLS:** 4 front buttons are used for scrolling through parameters and programming 

**DISPLAY:** A unique large custom LCD, with 3 user-programmable colour options 

**COMMUNICATIONS:** An optional RS485 port allows communication via Modbus RTV or BACNET (MSTP) protocol 

**PULSED OUTPUT:** A relay output can be assigned to either W.h or Var.h 

**INSTALLATION:** Supplied with installation guide or download complete installation manual and RS485 Modbus register address at www.hobut.co.uk/power-meters 

## **M850-LTHN POWER METERS** 

**==> picture [105 x 71] intentionally omitted <==**

## **SPECIFICATIONS** 

## **ACCURACY** 

Volts/Amps:             0.5% of reading Frequency:               0.1 Hz Active Power:           1% of reading Apparent Power:      1% of reading Power Factor:           1% of range Energy:                    IEC 1036 Class 1 

## **INPUT** 

Rated Un:                28-330V LN, 48-570V L-L Overload:                 800V continuous Burden:                    0.5VA per phase Rated In:                  0.5-6A (5A nominal) Overload:                 10 In for 1 sec Burden:                    0.5VA per phase Auxiliary:                  100-440V AC / 100-420V DC (or 10/70V DC) Frequency:               45/65Hz **DISPLAY** 

Digits:                      4 lines 9999 Custom LCD 

Brightness:               User adjustable **OUTPUT RELAY** 

Wh or VArh:            SPNO rated 50V Pulse output:           150mA 5W AC/DC Pulse duration:         Programmable from 40msec-200msec 

## **INSULATION** 

Installation category:                           III (480 V AC ph/ph) Degree of pollution:                            2 

Rated impulse withstand voltage:        IEC 60947-1-V imp: 4kV Meters front:                                       Class II Electrical security:                                IEC 61010-1 Inputs + Aux to case:                          4kV rms 50Hz for 1 min Inputs + Aux to RS485 port:               3kV rms 50Hz for 1 min Inputs + Aux to relay output:              1k5V rms 50Hz for 1 min Low voltage dc Aux to Inputs:             1k5V rms 50Hz for 1 min 

## **ELECTROMAGNETIC COMPATIBILITY** 

Immunity to: 

electrostatic discharges:                 IEC 61000-4-2-Level III radiated radio-Hz fields:                IEC 61000-4-3-Level III electrical fast transient/brusts:       IEC 61000-4-4-Level III impulse waves:                              IEC 61000-4-5-Level III conducted disturbances:                IEC 61000-4-6-Level III voltage dips & short interruptions: IEC 61000-4-11 Emissions to: 

conducted and radiated:               CISPR11-Class A 

## **ENVIRONMENT** 

Working temp:                                    -20 to +70ºC Storage temp:                                     -40 to +85ºC Relative humidity:                                0-95% non condensing Shock:                                                 30G in 2 planes 

## **ENCLOSURE** 

Black polycarbonate case to UL94V0 Weight:                                               0.3kg IP Rating:                                            IP52 (front) 

## **CONNECTION DIAGRAM** 

**==> picture [165 x 105] intentionally omitted <==**

**----- Start of picture text -----**<br>
L+ N-<br>AUX UH N L3 L2 L1<br>L3 L2 L1<br>l k l k l k<br>L1<br>L K<br>L2<br>L K<br>L3<br>L K<br>N<br>**----- End of picture text -----**<br>


**VOLTAGE             CURRENT L1    L2    L3     N    L1    L2    L3** 1ph                 3 **- -** 3     3 **- -** 1ph 3W              3     3 **-** 3     3     3 **-** 3ph 3W              3     3     3 **-** 3 **-** 3 3ph 4W              3     3     3     3     3     3     3 3ph 3W BAL          3     3     3 **-** 3 **-      -** 3ph 4W BAL          3 **-      -** 3 3 **-      -** Unused Voltage terminals are internally connected Secondary of CTs must be connected to earth 

## **DIMENSIONS (mm)** 

**==> picture [407 x 122] intentionally omitted <==**

**----- Start of picture text -----**<br>
96 19 61<br>92 (+0.8)<br>96 92 (+0.8)<br>Panel cut out<br>**----- End of picture text -----**<br>


Our policy is one of continuous development and therefore specifications may change without notice. 

## **HOWARD BUTLER LTD** 

CROWN WORKS, LINCOLN ROAD WALSALL WS1 2EB ENGLAND 

Tel: 01922 640003 Fax: 01922 723626 International Tel: +44 1922 640003   E-mail: sales@hobut.co.uk Web: www.hobut.co.uk

Updated at June 9, 2026

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