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Measurement functions Measuring range Display range Resolution Accuracy
Fault loop impedance
Fault loop ZL-PE, ZL-N, ZL-L 0,13 Ω…1999 Ω according to IEC 61557 0,00 Ω…1999 Ω from 0,01 Ω ±(5% of rdg. + 3 digits)
Fault loop ZL-PE in RCD mode from 0,5 Ω…1999 Ω according to IEC 61557 0,00 Ω…1999 Ω from 0,01 Ω from ±(6% of rdg. + 5 digits)
Measurement of RCD parameters
RCD trip test and measurement of tripping time tA test current 0,5 IΔn, 1 IΔn, 2 IΔn, 5 IΔn
RCD general and short-time delayed 0 ms…300 ms 0 ms…300 ms 1 ms ±(2% of rdg. + 2 digits)
RCD selective 0 ms…500 ms 0 ms…500 ms 1 ms ±(2% of rdg. + 2 digits)
Measurement of RCD tripping current RCD IA test current 0,3 IΔn…2,0 IΔn
with sinusoidal residual current (type AC) 3,0 mA…500 mA 3,0 mA…500 mA from 0,1 mA ±5% IΔn
with pulsating DC currents and with 6 mA DC bias (type A) 3,5 mA…420 mA 3,5 mA…420 mA from 0,1 mA ±10% IΔn
Insulation resistance
Product information

The Sonel MPI-506 is an ultra-compact yet fully equipped measuring device for testing electrical installations. Despite its handy size, it offers a variety of functions for comprehensive safety assessment of systems. Particularly noteworthy is the simple operability in combination with high precision – ideal for beginners and professionals alike.

Developed for daily use by professionals in the electrical and installation sector, the device is suitable for a wide range of environments – from construction sites to industry.


Central measuring functions

Loop impedance measurement

  • For supply networks with 220/380 V, 230/400 V, 240/415 V

  • Frequency range: 45…65 Hz | Operating voltage: 180…460 V

  • Display of resistance R and reactance X

  • 15 mA measurement for testing without RCD tripping

  • Max. current: 7.6 A (230 V), 13.3 A (400 V)

RCD testing (type AC & A)

  • Measurement of standard, delayed and selective residual current circuit breakers

  • Test currents: 10 / 15 / 30 / 100 / 300 / 500 mA

  • Determination of trip current (IΔn) and trip time (tA)

  • AUTO function for fully automatic RCD measurements

  • Testing of RE and UB without RCD tripping

Insulation resistance

  • Test voltages: 100 V, 250 V, 500 V

  • Ideal for assessing insulation quality

Protective conductor & equipotential bonding measurement

  • Testing in accordance with EN 61557-4 with ±200 mA

  • Auto-calibration for measuring leads of any length

  • Audible signal on successful continuity test

Phase sequence indication

  • Rapid identification of phase sequence for three-phase systems


Additional functions & operation

  • PE conductor test via contact electrode

  • Mains voltage & frequency measurement: 0…500 V

  • Memory for 990 measurement results

  • Bluetooth interface for wireless data transmission

  • Illuminated keys and display for comfortable working in low light


Simple handling & high efficiency

With the practical rotary selector switch, functions can be selected directly; further settings are made conveniently via front keys. All configurations remain stored – even when the battery is empty. The bright screen and illuminated controls make working in dark environments much more comfortable.

The generous internal memory eliminates the need for manual notes – ideal for quick on-site documentation.


Effective safety tests in record time

The MPI-506 is ideally suited for rapid safety assessment of electrical systems – whether in households, commercial premises or industry. Particularly advantageous:

  • RCD test in automatic mode

  • Accessory test via socket using optional WS adapter


Built for tough everyday construction site use

The robust IP67 housing reliably protects against dust and water – perfect for use under demanding conditions.


Software

Properties
electromagnetic compatibility (EMV): EN 61326-2-2, IEC/EN 61326-1
interface: Bluetooth
measurement category: CAT III 600 V, CAT IV 300 V
protection rating: Enclosure IP 67
Weight: 0.8 kg
Width: 102 mm
Height: 220 mm
Measurement functions Measuring range Display range Resolution Accuracy
Fault loop impedance
Fault loop ZL-PE, ZL-N, ZL-L 0,13 Ω…1999 Ω according to IEC 61557 0,00 Ω…1999 Ω from 0,01 Ω ±(5% of rdg. + 3 digits)
Fault loop ZL-PE in RCD mode from 0,5 Ω…1999 Ω according to IEC 61557 0,00 Ω…1999 Ω from 0,01 Ω from ±(6% of rdg. + 5 digits)
Measurement of RCD parameters
RCD trip test and measurement of tripping time tA test current 0,5 IΔn, 1 IΔn, 2 IΔn, 5 IΔn
RCD general and short-time delayed 0 ms…300 ms 0 ms…300 ms 1 ms ±(2% of rdg. + 2 digits)
RCD selective 0 ms…500 ms 0 ms…500 ms 1 ms ±(2% of rdg. + 2 digits)
Measurement of RCD tripping current RCD IA test current 0,3 IΔn…2,0 IΔn
with sinusoidal residual current (type AC) 3,0 mA…500 mA 3,0 mA…500 mA from 0,1 mA ±5% IΔn
with pulsating DC currents and with 6 mA DC bias (type A) 3,5 mA…420 mA 3,5 mA…420 mA from 0,1 mA ±10% IΔn
Insulation resistance