MZC-320S Earth fault loop impedance tester (WMGBMZC320)

MZC-320S Earth fault loop impedance tester (WMGBMZC320)

  • MZC-320S Earth fault loop impedance tester (WMGBMZC320)
    MZC-320S Earth fault loop impedance tester (WMGBMZC320)
    • Index: WMGBMZC320
    • Category: Earth fault loop impedance tester
    • Condition: New
    • Mains voltage up to max. 550V
      • Price (Net):
      • EUR 2233.00
      • Availability:
      • on request
      • Select quantity:
Description

Is the MZC-320S the right earth fault loop impedance tester for me?

Choosing the right loop impedance tester primarily depends on the intended area of application. Before purchasing, it’s important to clearly define what you need the tester for.

Start by asking yourself: What is the maximum system voltage the device needs to support? Are you working on 400 V, 690 V, or 800 V systems?

The MZC-320S supports measurements on systems with voltages up to 550 V.

Next, consider the minimum and maximum loop impedance values the tester must be capable of measuring.

The MZC-320S operates within the following measurement ranges: 7.2 mΩ – 1999 mΩ (four-wire measurement) and 0.13 Ω – 199.9 Ω (two-wire measurement)/p>

You can calculate the required minimum loop impedance in an installation based on the circuit breaker’s tripping characteristic, its rated current, and the system voltage. This ensures that, in the event of a short circuit, the protective device will trip as expected. Ideally, your measured loop impedance will be even lower. This calculation gives you a good idea of the measurement range your tester must support.

To help you make the right decision, this product page provides all essential information—including datasheet specifications, standard compliance, and a complete list of standard and optional accessories.

Measuring touch voltage with the MZC-320S

In addition to measuring fault loop and line impedance, the MZC-320S is also capable of measuring touch voltage, with readings of up to 100 V. This measurement can be performed in two variants:

  • Touch voltage (voltage between conductive parts during simultaneous contact)
  • Shock (touch) voltage (voltage between a conductive part and the ground, using a special measuring probe)

What can be measured with the MZC-320S earth fault loop impedance tester?

Die nachstehende Tabelle soll dir eine schnelle Übersicht über die möglichen Messungen und Funktionalitäten unseres MZC-320S Schleifenimpedanz-Messgeräts geben.

  • Legend:
    • check
    • Measurement possible (accessory required)
    • check
    • Measurement possible (accessory included)
    • close
    • Measurement not possible
Measurement MZC-320S
Loop impedance
Loop impedance (Four-wire measurement) check
Loop impedance (Two-wire measurement) check
Prospective short-circuit current (calculated) check
Voltage
Voltage measurement check
Frequency measurement check
Touch voltage measurement check
Shock (touch) voltage measurement check

Scope of delivery at a glance

The following graphic shows the standard scope of delivery for the MZC-320S. You can find the individual items included with the loop impedance tester listed in the detailed scope of delivery section.

Scope of delivery MZC-320S (WMGBMZC320)

Scope of delivery MZC-320S (WMGBMZC320)
Technical data

Datasheet values MZC-320S

The following table provides a detailed list of the technical specifications of the MZC-320S.

If you would first like to get an overview, we recommend our comparison chart of the MZC series earth fault loop impedance testers. There, you can quickly compare the devices side by side.

Measurement function Measurement range Display range Resolution Accuracy
Mains voltage
AC mains voltage 0 – 550 V 0 – 550 V 1 V ±(2% of m.val. + 2 digits)
Frequency
Frequency 45 – 65 Hz 45 – 65 Hz 0.1 Hz ±(0.1% of m.val. + 1 digits)
Loop impedance (Four-wire measurement) max. 300 A: 280 A (500 V), 220 A (400 V), 130 A (230 V)
Loop impedance (ZS) 7.2 mΩ - 1999 mΩ
acc. to IEC 61557-3		 0.0 – 199.9 mΩ 0.1 mΩ ±(2% of m.val. + 2 mΩ)
200 – 1999 mΩ 1 mΩ
Resistance (R) 0.0 – 1999 mΩ 0.0 – 199.9 mΩ 0.1 mΩ ±(2% of m.val. + 2 mΩ) of ZS
Reactance (X) 200 – 1999 mΩ 1 mΩ
Short-circuit current (IK) 57.5 A – 15.9 kA
UN = 115 V		 115 A – 199.9 A 0.1 A Calculated from the error of the loop impedance
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 kA – 199.9 kA 0.1 kA
200 kA – 500 kA 1 kA
115.0 A – 32.9 kA
UN = 230 V		 115 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 kA – 199.9 kA 0.1 kA
200 kA – 500 kA 1 kA
200 A – 55.5 kA
UN = 400 V		 115 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 kA – 199.9 kA 0.1 kA
200 kA – 500 kA 1 kA
250 A – 69.4 kA
UN = 500 V		 115 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 kA – 199.9 kA 0.1 kA
200 kA – 500 kA 1 kA
Touch voltage
Touch voltage 0 – 100 V 0 – 100 V 1 V ±(10% of m.val. + 2 digits)
Shock (touch) voltage
Loop impedance (Two-wire-measurement) max. 27 A (500 V), 21 A (400V), 24 A (230V)
Loop impedance (ZS) 0.13 Ω - 199.9 Ω
(Test lead 1.2m)
acc. to IEC 61557-3		 0.00 – 19.99 Ω 0.01 Ω ±(2% of m.val. + 3 digits)
20.0 – 199.9 Ω 0.1 Ω ±(3% of m.val. + 3 digits)
0.15 Ω - 199.9 Ω
(Test lead 5m)
acc. to IEC 61557-3		 0.00 – 19.99 Ω 0.1 Ω ±(2% of m.val. + 3 digits)
20.0 – 199.9 Ω 0.1 Ω ±(3% of m.val. + 3 digits)
0.19 Ω - 199.9 Ω
(Test lead 10m)
acc. to IEC 61557-3		 0.00 – 19.99 Ω 0.1 Ω ±(2% of m.val. + 3 digits)
20.0 – 199.9 Ω 0.1 Ω ±(3% of m.val. + 3 digits)
0.25 Ω - 199.9 Ω
(Test lead 20m)
acc. to IEC 61557-3		 0.00 – 19.99 Ω 0.1 Ω ±(2% of m.val. + 3 digits)
20.0 – 199.9 Ω 0.1 Ω ±(3% of m.val. + 3 digits)
Resistance (R) 0.00 – 199.9 Ω 0.00 – 19.99 Ω 0.01 Ω ±(2% of m.val. + 3 digits) of ZS
Reactance (X) 20.0 – 199.9 Ω 0.1 Ω ±(3% of m.val. + 3 digits) of ZS
Short-circuit current (IK),
UN = 230V		 1.150 A – 1849 A
(Test lead 1.2m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.001 A Calculated from the error of the loop impedance
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
1.150 A – 1539 A
(Test lead 5m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
1.150 A – 1262 A
(Test lead 10m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0,1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
1.150 A – 924 kA
(Test lead 20m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
Short-circuit current (IK),
UN = 400V		 2.00 A – 3.21 kA
(Test lead 1.2m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.001 A Calculated from the error of the loop impedance
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
2.00 A – 2.67 kA
(Test lead 5m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
2.00 A – 2.19 kA
(Test lead 10m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA
2.00 A – 1607 A
(Test lead 20m)
acc. to IEC 61557-3		 1.150 A – 1.999 A 0.1 A
2.00 A – 19.99 A 0.01 A
20.0 A – 199.9 A 0.1 A
200 A – 1999 A 1 A
2.00 kA – 19.99 kA 0.01 kA
20.0 – 40.0 kA 0.1 kA

Table: Datasheet values MZC-320S

Conformity to standards of the MZC-320S

The MZC-320S loop impedance tester complies with the applicable EU standards, which are derived from IEC standards and EU directives and are incorporated into national regulations such as the BS standards.

Below, we list two tables showing the standards the MZC-320S conforms to. The first table outlines compliance with the relevant measurement methods. The second table shows the standards that apply to the device itself.

Standards compliance of the MZC-320S: measurement methods
IEC 61557: Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures
BS EN IEC 61557-3 Part 3: Loop impedance

Standards compliance of the MZC-320S: measurement methods
Standards compliance of the MZC-320S: the tester
Electromagnetic compatibility (EMC 2014/30/EU)
BS EN IEC 61326-1 Electrical equipment for measurement, control, and laboratory use – EMC requirements. Part 1: General requirements
BS EN IEC 61326-2-2 Electrical equipment for measurement, control, and laboratory use – EMC requirements. Part 2-2: Particular requirements – Test configurations, operational conditions and performance criteria for portable test, measuring and monitoring equipment used in low-voltage distribution systems
Low voltage directive (LVD 2014/35/EU)
BS EN IEC 61010-1 Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 1: General requirements
BS EN IEC 61010-2-030 Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 2-030: Particular requirements for testing and measuring circuits
BS EN IEC 61010-2-033 Safety requirements for electrical equipment for measurement, control, and laboratory use. Part 2-033: Particular requirements for hand-held multimeters and other meters for domestic and professional use, capable of measuring mains voltage
Radio equipment directive (RED 2014/53/EU)
ETSI EN 301489-1 Electro Magnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common technical requirements; Harmonised Standard for ElectroMagnetic Compatibility
ETSI EN 301489-17 Electro Magnetic Compatibility (EMC) standard for radio equipment and services; Part 17: Specific conditions for Broadband Data Transmission Systems; Harmonised Standard for ElectroMagnetic Compatibility
ETSI EN 300328 Wideband transmission systems; Data transmission equipment operating in the 2,4 GHz band; Harmonised Standard for access to radio spectrum
BS EN 62479 Assessment of the compliance of low power electronic and electrical equipment with the basic restrictions related to human exposure to electromagnetic fields (10 MHz to 300 GHz)

Standards compliance of the MZC-320S: the tester
Download

User manual MZC-320S

User manual MZC-320S download

Datasheet MZC-320S

Datasheet MZC-320S download

Declaration of conformity MZC-320S

Declaration of conformity MZC-320S download
Scope of delivery
  • Legend:
    • check
    • Accessory is included in the scope of delivery
    • close
    • Accessory is not included in the scope of delivery
Scope of delivery MZC-320S
Two-wire test lead, 3m, (12/32A) U1/I1 (WAPRZ003DZBBU1I1)
check
Two-wire test lead, 3m, (12/32A) U2/I2 (WAPRZ003DZBBU2I2)
check
Test lead 1.2 m, yellow, 1kV (WAPRZ1X2YEBB)
check
Test lead 1,2m, black, 1 kV (WAPRZ1X2BLBB)
check
Kelvin test probe, 1 kV (WASONSPGB1)
check
Kelvin clamp, 1 kV, 25 A (WAKROKELK06)
check
Crocodile clip, black, 1 kV, 32 A (WAKROBL30K03)
check
Test probe, black (WASONBLOGB1)
check
Test probe, yellow (WASONYEOGB1)
check
Z-19 Battery charger (WAZASZ19)
check
Power supply cable 230 V (IEC-C7 plug) (WAPRZLAD230)
check
Carrying case L-14 (WAFUTL14)
check
USB cable (WAPRZUSB)
check
Factory calibration certificate (WADOKCK)
check

List of items included with the MZC-320S
Accessories

Here you'll find an accessories list for the MZC-320S loop impedance tester, which we recommend for certain applications or situations based on our own experience.

Accessory Description
Two-wire test lead, 6m, (10/25A) U1/I1 (WAPRZ006DZBBU1I1)

The two-wire test lead has a length of 6 m (U1/I1). It is used for four-wire measurements of earth fault loop impedance.

Helps with: Measurements on electrical installations where longer test leads facilitate loop impedance testing.
Two-wire test lead, 6m, (10/25A) U2/I2 (WAPRZ006DZBBU2I2)

The two-wire test lead has a length of 6 m (U2/I2). It is used for four-wire measurements of earth fault loop impedance.

Helps with: Measurements on electrical installations where longer test leads facilitate loop impedance testing.

Recommended accessory for the MZC-320S earth fault loop impedance tester

Complete accessory list for the MZC-320S earth fault loop impedance tester

Below you will find the complete list of accessories for the MZC-320S Z-loop impedance tester. The list is organized by index.

Index Description

Two-wire test lead, 6m, (10/25A) U1/I1

Two-wire test lead, 6m, (10/25A) U2/I2

Test lead 5m, gelb, 1kV

Test lead 10m, gelb, 1 kV

Test lead 20m, gelb, 1 kV

Carrying case L-4

Backpack L-7

Sonel Reader: Free software for transferring data from the tester to a PC

Sonel Reports Plus: Software for creating test documentation

Accessory list for the MZC-320S earth fault loop impedance tester (by index)