MZC-304
Catalog index: WMGBMZC304
Fault Loop Impedance Meter
Measurement of fault loop and more
Get to know the Sonel MZC-304 compact short circuit loop impedance meter with many measurement functions.
The presented model is one of the smallest instruments available on the market intended for short circuit loop impedance measurements in 230/400 V networks and continuity of protective and equipotential connections measurements. The MZC-304 meter performs short circuit loop measurements with a resolution of 0.01 Ω, also in the case of measurements in networks protected with RCD switches. With a backlit keyboard and display, the device can be used even in low light. The device has a sealed casing with IP67 protection, which is characterised by excellent resistance and ensures smooth operation even under adverse environmental conditions.
The device meets the requirements set out in standard EN 61557.
Capabilities
- Fault loop impedance measurement with 0.01 Ω resolution.
- Low-current impedance measurement in circuits protected by RCD ≥ 30mA with 0.01 Ω resolution (range of 180...270 V)
- Operates in networks with voltages 220/380 V, 230 V/400 V, 240/415 V (operating range 180...460 V)
- Operating voltage range: 180…270 V (for ZL-PE and ZL-N) and 180…460 V (for ZL-L).
- Maximum measuring current: 7.6 A for 230 V (3x10 ms), 13.3 A for 400 V (3x10 ms).
- Operating frequency 45…65 Hz
- Calculation of Ik fault current.
- Measurement with swapped L and N conductors.
- Measurement of resistance (RS) and reactance (XS) components.
- Low-voltage measurement of continuity of circuit and resistance.
Additional features
- Contact electrode - quick testing of proper connection of PE conductor.
- Voltage measurement 0...500 V.
- Frequency measurement 45.0...65.0 Hz.
- Memory of 990 measurement results, ability to transfer the data to a PC via Bluetooth.
- Power supply: batteries (4 x LR14) or rechargeable batteries (4 x NiMH).
Application
The instrument is dedicated to personnel performing measurements in single and multi-family buildings, office buildings, industrial plants and any other places equipped with low voltage electrical systems. In addition, the meter is intended for maintenance personnel working on objects, where fault currents reach 4.4 kA (measured according to EN 61557). MZC-304 is also a great tool for checking circuits additionally protected by residual current devices.
Specification
Short circuit loop impedance ZL-PE,ZL-N,ZL-L , resistance and reactance measurement
Short circuit loop impedance ZS
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,01 Ω | ±(5% m.v. + 3 digits) |
| 20,0…199,9 Ω | 0,1 Ω | |
| 200…1999 Ω | 1 Ω |
- nominal work voltage UnL-N / UnL-L: 220/380 V, 230/400 V, 240/415 V,
- voltage range 180…270 V (for ZL-PE i ZL-N) and 180…460 V (dla ZL-L),
- nominal network frequency fn: 50 Hz, 60 Hz,
- frequency range: 45…65 Hz,
- maximum measurement current 7,6 A for 230 V (3 x 10 ms), 13,3 A for 400 V (3 x 10 ms),
- PE terminal connection correctness check with the help of touch electrode (ZL-PE, ZL-PE(RCD)),
- short circuit current calculation for nominal voltage
Short circuit loop resistance RS and reactance XS
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,01 Ω | ±(5% m.v. + 5 digits) wartości ZS |
| 20,0…199,9 Ω | 0,1 Ω |
calculated and displayed for ZS<200 Ω
Short circuit loop impedance ZL-PE RCD measurement – without tripping the circuit breaker
Short circuit loop impedance ZS measurement
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,01 Ω | ±(6% m.v. + 10 digits) |
| 20,0…199,9 Ω | 0,1 Ω | ±(6% m.v. + 5 digits) |
| 200…1999 Ω | 1 Ω |
- No RCD reaction for I?n≥30 mA,
- nominal work voltage Un: 220 V, 230 V, 240 V,
- voltage range: 180…270 V,
- nominal network frequency fn: 50 Hz, 60 Hz,
- frequency range: 45…65 Hz,
- PE terminal connection correctness check with the help of touch electrode
- short-circuit current calculation for nominal voltage
Short circuit resistance RS and reactance XS display range (for ZL-PE RCD)*
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,01 Ω | ±(6% m.v. + 10 digits) of ZS value |
| 20,0…199,9 Ω | 0,1 Ω | ±(6% m.v. + 5 digits) of ZS value |
*ocalculated and displayed for Zs<200 Ω
Low voltage resistance measurement
Measurement of continuity of equipotential bondings and protective conductors with ±200 mA current
| Range | Resolution | Accuracy |
| 0,00…19,99 Ω | 0,01 Ω | ±(2% m.v. + 3 digits) |
| 20,0…199,9 Ω | 0,1 Ω | |
| 200…400 Ω | 1 Ω |
- open terminals voltage: 4…9 V DC,
- output current at R<2 Ω: min 200 mA (ISC: 200…250 mA),
- test leads resistance compension,
- measurement for both current polarization
Low current resistance measurement
| Range | Resolution | Accuracy |
| 0,0…199,9 Ω | 0,1 Ω | ±(3% m.v. + 3 digits) |
| 200…1999 Ω | 1 Ω |
- open terminals voltage4…9 V DC
- output current ISC< 8 mA,
- accustic signal for measured resistance < 30 Ω ± 50%,
- test leads resistance compensation.
AC voltage measurement
| Range | Resolution | Accuracy |
| 0,0 V…299,99 V | 0,1 V | ±(2% m.v. + 6 digits) |
| 300 V…500 V | 1 V | ±(2% m.v. + 2 digits) |
- frequency range 45…65 Hz,
- test result refreshing: twice per second
Frequency measurement
| Range | Resolution | Accuracy |
| 45,0 V…65,0 Hz | 0,1 Hz | ±(0,1% m.v. + 1 digit) |
- voltage range: 50… 500 V
Electrical safety:
- type of insulation: double, according EN 61010, 61557:2007 – 01
- measurement category: III 600 V (CAT IV 300 V)
- protectin class acc. to EN 60529: IP67
Other technical data:
- power supply: package of batteries (AA, 4 pcs.)
- batteries performance (short-circuit loop): min.5000 measurements
Rated operational conditions:
- operating temperature: 0…+50°C
- humidity: 20 – 80%
- rated mains voltage: 220/380 V, 230/400 V, 240/415 V
“m.v. = measured value”
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