M100-WT kWh


M100-WT kWh

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M100 kWh Transducer

M100-WTx Introduction

The M100-WTx kWh transducer comes in a 100mm case.
Its mechanical counter is 7 digits long and is non resetable.
When the counter exceeds 9999999 it rolls over to zero.
The M100-WTx can be supplied with a pulsed output allowing it to be connected to remote counters, PLCs data loggers and computers and a mA output proportional to the instantaneous power being measured.
1. Pulsed output.
2. Analogue output of instantaneous power
3. Non standard pulsed width.
4. Calibration at temperature other than 23 °C
5. Calibration at nominal Hz 35 ..... 450 Hz.

Product code:
100mm case with Mechanical Counter
Single Phase..............M100-WT1
3ph 3W bal. Load.....M100-WT2
3ph 4W bal. Load.....M100-WT3
3ph 3W unbal. Load..M100-WT4
3ph 4W unbal.load.....M100-WT9

Ordering Information Example
Product Code M100-WT4
C.T. ratio 500/5 AMP
Frequency 50Hz
Auxiliary Voltage 230V
Options Pulsed output


M100-WTx specification

Input (accuracy range)
Rated Un:
57V to 500V specify nominal voltage.
Range 80-120% Un
Burden <0.2VA per phase

Rated In:
1A or 5A
Range 10-120% In
Burden <0.5VA per phase

Overload 1.5 x Un continuous
4 x Un for 1 second
Overload 4 x In continuous.
50 x In for 1sec

Frequency - nominal range 50/60 Hz  (45/65Hz working)

Single phase
3 phase 3 wire balanced load
3 phase 4 wire balanced load
3 phase 3 wire unbalanced load
3 phase 4 wire unbalanced load

Active Energy 1% of reading (IEC1036)
Accuracy to IEC1036 Class 1 BS5685 (IEC521)

Auxiliary Voltage
115V AC or 230V AC or 400 V AC

Current And Voltage Ratios
Internally selectable

Analogue Output
Accuracy Class 1%
Rated value 0-1mA into <5 kOhm
Rated value 0-20mA into <250 Ohms

Test Voltage:
Test Voltage 4 kV RMS 50 Hz for 1 min (3kV if analogue output required)
Impulse Test:
Impulse Test EMC 5kV transient complying with IEC801/EN55020
HF interference:
EHF 2.5 kV 1MHz complying with IEC255-4
Class II complying with IEC348/BS4743 DIN57411/VDE 0411

Working Temperature 0 to +60 °C
Function Temperature - 25 to +70 °C
Storage Temperature -55 to +85 °C
Temperature Coefficient 0.01% per °C
Relative Humidity 0-95% non condensing
Warm up time 1 min.
Shock 30G in 3 planes

100mm Trans.case 100 x 70 x 112mm light grey polycarbonate complying with UL 94 VO
Fixing Snap on Din rail 35 x 7.5 mm complying with DIN 50022 BS 5584
Enclosure code Case IP50 / terminals IP 30 complying with IEC529 BS5490 DIN40050
Screw terminal for 2 x 0.5-3.5mm

Applied Standards
Designed to IEC1036 accuracy BS5685 (IEC521)

Output Relay
kW.h pulsed output.
Normally open volt free contact 50V 150mA 5W ac/dc
Pulse rate - standard 1 pulse per kW.h ( 1 pulse = 10 kW.h on higher CT & VT ratios)
Pulse duration - standard 250 ms (other values optional on request )
Led flash rate - 0.1 kW.h per flash