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MI 3122 SMARTEC Z Line-Loop /RCD Tester

The MI 3122 SMARTEC Z Line-Loop / RCD designed specifically for live circuit testing perfect for preventative maintenance: Line & loop impedance & RCD testing, voltage & frequency measurements.

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557.04 incl. VAT)
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  • Competitive quote
  • Expert technical advice/demos
  • Trusted aftercare support




Metrel MI 3122 SMARTEC Z Line-Loop & RCD Tester

An ideal tester for professional electrical installers who perform RCD, loop, line, AC voltage, frequency and phase sequence tests required by the EN 61557 standard.

All the results can be quickly saved on the instrument with bright red and green PASS / FAIL lights and help screens for each measurement making handling of the instrument easy and clear.

These results can then downloaded for evaluation using the optional A 1291 EuroLink PRO or A 1290 EuroLink PRO Plus software designed for professional report building.

Online voltage monitoring system allows the operator to control what is happening on three simultaneous voltages in real-time.

Metrel MI 3122 Key Features:

  • Line impedance
  • Loop impedance
  • Loop impedance with Trip Lock RCD function
  • TRMS voltage and frequency
  • Phase sequence
  • RCD testing (general and selective, type AC and A)
  • Help screens: instrument comes complete with built-in help screens for referencing on site
  • LED Pass/Fail indicators: two LED indicators for PASS / FAIL evaluation of test results are placed on both sides of the LCD
  • Built-in fuse tables: this unique feature allows automatic evaluation of the line / loop impedance compared to the regulations
  • Online voltage monitoring: monitors all 3 voltages in real-time
  • Downloadable: downloads via RS232 or USB cable directly to the PC with the help of the optional software
  • Upgradeable: if changes occur to the regulations upgrades can be made to the firmware to keep the instrument up to date
  • Trip Lock function: Zs (RCD) function performs a loop impedance test without tripping the RCD
  • Built-in charger and rechargeable batteries: instrument has a built-in charging circuit and comes complete with a set of rechargeable NiMH batteries
  • RCD auto: automated RCD testing procedure significantly reduces test time
  • Easy to use: large bright LCD display and large buttons enable easy handling of the instrument (even while wearing gloves)
  • Magnetic holder: magnet for fixing instrument on metal surfaces enables hands-free operation

MI 3122 Perfect For:

  • Verification, maintenance and periodic testing of electrical installations
  • Evaluation of protective measures in LV-installations (fuse size, RCD operation)
  • Troubleshooting on live installations
  • Testing on CAT IV installations (distribution side of installations, LV-substations, industrial plants etc)

What comes with the MI 3122?

  • MI 3122 Smartec Z-Loop-Line / RCD tester
  • Soft hand strap
  • A 1003 Mains plug
  • A 1296 Test leads 3 x 1.5 m (brown, green, blue)
  • 12 V battery charging adapter
  • UK mains cable for charging adapter
  • A 1015 Test probe (blue)
  • A 1298 Test probe (brown)
  • A 1062 Test probe (green)
  • A 1310 Crocodile clip (blue)
  • A 1297 Crocodile clip (brown)
  • A 1309 Crocodile clip (green)
  • Short instruction manual
  • Instruction manual on CD
  • Calibration certificate


Comparison Chart for: Metrel MI 3122 SMARTEC Z Line-Loop /RCD Tester

MI 3121MI 3122MI 3123MI 3110MI 2088
Insulation / ContinuityZ Line-Loop / RCDEarth / ClampEurotestIMEarth Insulation
Insulation resistance
Test voltage (VDC)50 … 100050 … 1000
Insulation resistance measuring rangeup to 30 GΩ
Continuity and low resistance Measurement
Continuity of PE conductor with automatic polarity change, test current 200mA
Low resistance measurement (continuous measurement), test current 7 mA.
Line/Loop Impedance
Line impedance with Ipsc calculation
Loop impedance with Ipsc calculation
RCD Trip Lock loop impedance
Built-in fuse tables for PASS / FAIL evaluation
RCD Testing
Contact voltage without RCD tripping
RCD trip-out time
RCD trip-out current with rising test current
Automatic testing of RCDs
RCD type (general and selective)AC / A
Voltage Frequency
AC voltage measurement
Online voltage monitor
Frequency measurement
Phase Sequence
L1 - L2 - L3
Earth, Current Measurements
Earth resistance 3-(4-)wire method
Earth resistance 3-(4-)wire method with additional current clampOptionOption
Earth resistance measurement with 2 current clampsOptionOption
Specific earth resistanceYes (without ro adapter)
TRMS currentOption
TRMS leakage / load currentOption
IT Earthing System Specific Measurements
Insulation Monitoring Devices (IMD) testing (IT systems)
First fault leakage current (ISFL) measurement (IT systems)
Predefined mini Autosequences
Other Features
Varistor test
Nominal frequency range15 Hz ... 500 Hz15 Hz ... 500 Hz40 Hz ... 500 Hz14 Hz ... 500 Hz45 Hz ... 55 Hz
PASS / FAIL evaluation of test results
Touch electrode
Help menu
Communication Ports
Memory and SoftwareOption
Number of memory levels / memory locations2 / 15003 / 15003 / 15003 / 5002 / 1000
Professional PC SWOptionOptionOption
Advanced PC SWOptionOptionOptionOption
General Data
Safety categoryCAT III / 600 V CAT IV / 300 VCAT III / 600 V CAT IV / 300 VCAT IV / 50 VCAT III / 600 V CAT IV / 300 VCAT III / 300 V CAT II / 600 V
Batteries6 x AA6 x AA6 x AA6 x AA4 x CC
Built-in battery charger


Accessory Code Description Price (Ex VAT)
A1003 Mains Plug £51.72 ADD
A1013 Crocodile Clip Black £7.95 ADD
A1015 Test Probe Blue £6.89 ADD
A1016 Test Probe Red £6.89 ADD
A1018 High Accuracy Current Clamp £296.94 ADD
A1019 Current Clamp £301.86 ADD
A1055 Test Leads (Red; Black) £40.50 ADD
A1062 Test Probe Green £6.89 ADD
A1064 Crocodile Clip Red £7.95 ADD
A1153 20 m Test Lead Black £49.82 ADD
A1154 4 m Test Lead Black £26.50 ADD
A1160 6 Cell AA battery charger £146.28 ADD
A1164 50 m Test Lead Black £79.50 ADD
A1169 Fast charger for 12AA/ 6 C Type £305.28 ADD
A1191 Fuse Locator £224.82 ADD
A1297 Crocodile Clip Brown £7.95 ADD
A1298 Test Probe Brown £6.89 ADD
A1296 Test Leads (Brown; Green; Blue) £46.64 ADD
CS2099 Eurocheck Field Calibrator £307.40 ADD