MZC-310S

The MZC310S is a professional portable meter for testing electrical installations with over-current circuit breakers. The instrument measures short-circuit L-PE, L-N and L-L loop and prospective short-circuit loop current. A measurements can be done either with low testing current (up to 42 A) with 2-pole method or high testing current (up to 280 A) with 4-pole method that enables measurements with very high accuracy and resolution. The results can be stored in the internal memory and send to a computer via serial interface.

Measurement of very low short circuit loop impedances (with resolution 0,1 mΩ) with a current of 150 A at 230 V; maximum 280 A at 440 V or measurement with a current of 23 A at 230 V; maximum 42 A at 440 V.

• measurements in installations with rated voltages between: 220/380 V and 230/400 V and frequencies 45…65 Hz,
• ability to perform measurements in short circuit system: phase-phase, phase-protective, phase-neutral,
• differentiation between the phase voltage and the inter-phase voltage while calculating the shortcircuit current,
• Ability to change the length of test leads (measurement 23/42 A),
• four-pole method, test leads do not require calibration (measurement 150/280 A).

Touch voltage and touch shock voltage measurement (with resistor 1 kΩ).

AC voltage measurement in range 0…440 V.

Memory for 999 measurement results with an ability to transfer the data to a PC.

Meter meets the requirements of the standard EN 61557.

Electric security:

• type of insulation: double, according to EN 61010 – 1 and IEC 61557
• measurement category: CAT IV 300 V acc. to EN 61010 – 1
• protection class acc. to EN 60529: IP20

Other technical data:

• power supply alkaline batteries LR14 (C) (5 pcs.)
• resistor limiting the current:
• for measurement 4p: 1,5 Ω
• for measurement 2p: 10 Ω
• number of short circuit loop measurements (alkaline batteries): min. 2000 (4/min.)
• temperature coefficient: ±0,1% of measured value /°C

Rated operational conditions:

• operating temperature: 0…+40°C

Voltages measurement (True RMS)

• frequency range: DC, 45…65 Hz
• input impedance of the voltmeter: >200 kΩ

Frequency measurement (for voltages within the range 50…440 V)

Short circuit loop parameters measurement using high current (4p, I_max=280 A)

High-current of measurement of short circuit loop impedance Z_S:
measuring range according to IEC61557: 7,2 mΩ…1999 mΩ

Short circuit resistance R_S and reactance X_S display range

Prospective short circuit loop current
measuring range according to IEC 61557:

• for U_n = 230 V 115,0 A…32,0 kA
• for U_n = 400 V 200 A…55,7 kA

• * 230 kA for U_L-N
• 400 kA for U_L-L

Measurement of short circuit loop using standard current (2p, I_max=42 A)

Touch voltage measurement U_ST (shock voltage U_T)

Short circuit loop impedance Z_S measurement:
measuring range according to IEC61557: 0,13 Ω…199,9 Ω for 1,2 m long test leads

Short circuit resistance R_S and reactance X_S display range

Prospective short circuit loop current

„m.v.” – measured value