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The MZC203 instruments are cost effective, portable and easy to usemeters for testing electrical installations with overcurrent circuit breakers. The instrument measures short-circuit (L-PE, L-N or LL) loop resistance and prospective short-circuit loop current. The meter belongs to the MZC200 Series which consists of four types of instruments (MZC-200, MZC- 201, MZC-202 and MZC-203), each for different nominal line voltage.

MZC-200,201,202,203 Technical Specifications

Short circuit loop resistance measurement:
- short circuit loop phase-to-phase(L-L) and phase-to-PE(N) measurement, neutral L-PE(N),
- automatic calculation of prospective short-circuit loop current,
- selectable test leads length 1,2m; 5m; 10m; 20m,
Test for coutinuity of protecting wires and equalizing connection.
AC voltages measurement.
Autoranging.
Memory of the last measurement.
AUTO-OFF function.
Versions available:
- MZC-200: operate in mains voltage 220/380 V or 230/400 V,
- MZC-201: operate in mains voltage 290/500 V,
- MZC-202: operate in mains voltage 100/170 V,
- MZC-203: instrument, manufactured at special order for any chosen mains voltages, less than 500V, allows short circuit loop impedance measurement.
Meter meets the requirements of the standard EN 61557.

The range of voltages in the short circuit loop resistance measurement:

MZC-200: 180...440V
MZC-201: 240...550V
MZC-202: 85...190V
MZC-203: upon request, up to 500V

rated frequency: 45...65 Hz

Short-circuit loop measurement resistor:

MZC-200: 15 Ω
MZC-201: 22 Ω
MZC-202: 6,8 Ω
MZC-203: selected according to the rated voltage

Maximal test current:

MZC-200
for 230V:     15,3A (10ms)
for 400V:     26,7A (10ms)
MZC-201
for 290V: 13,2A (10ms)
for 500V: 22,7A (10ms)
MZC-202
for 100V:     14,7A (10ms)
for 170V:     25,0A (10ms)
MZC-203
selected according to the rated voltage

Short circuit loop resistance measurement:
measuring range according to IEC 61557 for voltages196...440V, and a phases angle 0...180°
and 1,2m long test leads: 0,24...200Ω

Range	Resolution	Accuracy
0,00...9,99Ω	0,01 Ω	±(2,5% m.v. + 5 digits)
10,0...99,9Ω	0,1 Ω	±(2,5% m.v. + 3 digits)
100...200Ω	1 Ω	±(3% m.v. + 3 digits)

AC voltages measurement

Meter type	Range	Resolution	Accuracy
MZC-200	0...440 V	1 V	±(2% m.v. + 2 digits)
MZC-201	0...550 V
MZC-202	0...250 V
MZC-203	(max. 500 V)

?voltmeter input resistance ≥200 kΩ
?frequency 45...65Hz

Prospective of the short circuit loop current (calculated R_s and U_n)

Range	Resolution	Accuracy
0...9,99A	0,01A	accuracy of the current indication computed, respectively, with the use of resistance measurement
10,0...99,9A	0,1A
100...999A	1A
1,00...9,99kA	0,01kA
10,0 ... ***kA	0,1kA