Contacts Resistance Tester

  • JYL Circuit Breaker Contact Resistance Tester
JYL Circuit Breaker Contact Resistance Tester

JYL Circuit Breaker Contact Resistance Tester

  • suitable for switchgear and HV circuit breaker contact resiatnce testing
  • built-in lithium battery test 500 times by one charge
  • can be used in 1000kV substations
  • 100A output current
  • Product description: suitable for vacuum,SF6, solid circuit breaker and switchgear contact resistance testing,transformer bushing,welding joints,bus-bar joints, relay and switchgear contact resistance testing

As a high current passes through a pair of mechanically independent metallic contacts, the contact resistance must be as low as possible.Increasing the contact resistance of the contact often causes a large voltage drop on the contact, which reduces the input power of the load equipment. If the contact resistance of one or two contacts becomes large, the three-phase voltage of the load equipment will be unbalanced, causing phase loss operation. If the contact resistance is too large, great heat will be generated, which can make the metal discolor or even melt, damage the insulation layer, cause equipment failure, and even fire of flammable materials.So we need to make regular measurements of the dynamic and static contact resistance of the contacts to ensure that the contacts being tested are in good contact.

High contact resistance will lead to equipments burn out.

JYL Circuit breaker contact resistance tester is a new generation of contact resistance tester based on IEEE C57.09-1999(5.15) and got ILAC.MAR calibration certification, the tester is just 1.9kgs with built-in rechargeable battery, so it is suitable for site testing work. JYL can satisfy the measurement of contact resistance such as high-voltage switchgear , SF6 & Vacuum circuit breaker, medium voltage CT, transformer bushing joints, GIS cabinet, bus-bar joints, earth leading contact, cable termination connection, welding joints, relay metal contact resistance and so on.

JYL's main application range:

Distribution Cabnit Contact Resistance breaker Testing:

High Voltage Circuit Breaker Contact Resistance Testing:

Medium Voltage Testing & Cable Terminal Testing:


1. Built-in blue tooth communication function.

2. The output current is up to 100A which is suitable for most of the contact resistance items.

3. Test contact resistance rang:0.1 µΩ to 5mΩ

4. Tester 's shell has the function of insulation, anti creep, anti-wind, and anti-sand.

5. Anti-power frequency interference that can make sure the test precision in high frequency circumstances .

6. Equipped with highlight 5.6 inch color touch screen, so the tester can be used both indoor and outdoor.

7. With the function of monitoring and protecting the Battery power and the temperature of tester.

8. Flash disk interface for exporting data.

9. With data storage function, it can store 100 sets of testing data.

10. With function of automatic shutdown(shutdown without operation exceeding 5 minutes).

13. JYL circuit breaker contact resistance tester has built-in lithium battery(12V/5.2AH,Charging time is about 3 hours using special charger JS-042203(DC4.2V/2A*3 sets), not need AC power supply, so JYL contact resistance tester is suitable for field contact resistance testing.

JYL select series NEC Microprocessor to make sure high testing accuracy

Technical specification:


JYL Handheld contact resistance tester

Output current



Test range




±(reading*0.5% ± 1μΩ)

Current accuracy

± 5%

Minimum resolution


Output voltage

about 2.0V

Testing Time

quick10 S20 S30 S40 S50 S60 S (optional)

Testing times

>500 times (100A “quick” mode with 10 mΩ load by one charge)

resistance of special test cable


Temperature in operation

-20℃ ~40℃

Relative humidity

≤80%, No dew

Volume / Weight

L210mm x W150mm x H70mm / 1.9kg

CALIBRATION CERTIFICATE FROM ILAC.MRA(The world's most stringent calibration testing agency)

All KRI tests will adopt international express to reach any corner of the world as fast as 72 hours