SEW Logo

● 3 ½ digit LCD (2000-count).
● Backlight function.
● 15mA loop measurement which will not trip ELCBs.
● Convenient and easy for users to measure the loop impedance directly without bypassing the wires.
● Wiring check function.
● Over temperature protection.
● Over voltage protection.
● Built-in voltmeter.
● Built-in earth tester.
● Built-in loop/psc tester.
● Includes the TNT-EL Mains Lead
● Safety standard :
EN 61010-1 CAT III 300V
EN 61326-1

Authorised Australian Distributor

PDF Logo     SEW 8025LP Datasheet

Buy Now small


If you would like more information regarding this product, simply email us here.
  • This field is for validation purposes and should be left unchanged.
SKU: SEW 8025LP Tags: , ,

SEW 8025LP Earth fault loop impedance testing

Earth fault loop impedance is the path followed by fault current when a low impedance fault occurs between the phase conductor and earth, i.e. “earth fault loop”. Fault current is driven round the loop by the supply voltage. The higher the impedance, the lower the fault current will be and the longer it will take for the circuit protection to operate.

To make sure the protection operates fast enough, the loop impedance must be low. Every circuit must be tested to make sure that the actual loop impedance does not exceed that specified for the protective device concerned.

Prospective short circuit current (PSC) testing

The prospective short circuit or fault current at any point in an electrical installation is the current that would flow in the circuit if no circuit protection operated and a complete (very low impedance) short circuit occurred. The value of this fault current is determined by the supply voltage and the impedance of the path taken by the fault current. Measurement of PSC can be used to check that protective devices within the system will operate within safety limits and as per the safe design of the installation. PSC is normally measured between the phase and neutral.

8025LP Layout

The TNT-EL mains lead supplied with SEW 8025LP

SEW 8025LP Specifications:
Loop Impedance



Nominal test current at 0 Ω external loop


20 Ω

0.00~19.99 Ω

23A / 40ms

(2%rdg + 4dgt)

200 Ω

0.0~199.9 Ω

2.3A / 40ms

2000 Ω

0~1999 Ω

15mA / 400ms

Prospective Short-circuit Current



Nominal test current at 0 Ω external loop


20 KA

0.00~4.00 KA

23A / 40ms

Consider accuracy of loop impedance

2000 A

0~1999 A

23A / 40ms

200 A

0.0~199.9 A

2.3A / 40ms

Voltage Display      

Measuring range



150~260 V

(2%rdg + 4dgt)

at 0 Ω external loop

Temperature 0 ~ 40 °C
System voltage 230V +13%
System frequency  50Hz
None Battery system voltage 150V ~ 260V
Over Temperature Protection When overheating,the ”  ”  symbol will show on the LCD, and the 8025LP stop measuring.
Wiring check P-E LEDs illuminate when the wiring polarity of circuit under test is correct
N-E LED is light when P and N are reversed or the Earth is not connected.
15mA Loop measurement  Loop impedance 2000Ω range measurement is carried out with low test current (15mA).
The current will not cause tripping out for ELCBs.


There are no reviews yet.

Be the first to review “SEW 8025LP LOOP & PSC TESTER”