Contact Resistance Tester – Critical Testing of Electrical Connections
“Where every micro-ohm counts. Measure, verify and secure your electrical connections.”
Why Is It Important to Measure Contact Resistance?
In medium- and high-voltage electrical installations, the contact resistance of circuit breakers, disconnect switches, busbars, splices or connectors directly affects the efficiency, safety and service life of the system. A high-resistance connection can cause:
- Overheating at connection points
- Localized voltage drops
- Arc flash or short-circuit failures
- Energy losses and high operating costs
- Noncompliance with electrical safety regulations
Accurately measuring this resistance is critical for failure prevention and for ensuring the reliability of the electrical system.
What Is a Contact Resistance Tester?
A contact resistance tester (also called a micro-ohmmeter) is a high-precision instrument designed to measure extremely low resistances (in the micro-ohm or milli-ohm range) by applying a high test current.
This equipment is essential for maintenance, commissioning and diagnostic testing of electrical substations, transformer stations and power switchboards.
What Is It Used For?
✅ Verifying the quality of connections in power circuit breakers, disconnect blades, and moving and fixed contacts
✅ Detecting oxidation, dirt or poor mechanical tightness in electrical splices
✅ Ensuring the integrity of grounding (earthing) systems and equipotential bonds
✅ Performing predictive maintenance in substations and load centers
✅ Confirming the good condition of busbars, terminals and high-current splices
Benefits of Using a Contact Resistance Tester
- Accurate measurement in the µΩ to mΩ range
- High test current (up to 200 A or more) to simulate real load conditions
- Stable readings immune to electrical noise
- Ideal for testing power circuit breakers, disconnect switches and main contacts
- Helps prevent catastrophic failures and financial losses
- Portable, rugged instrument that is easy to operate in the field
- Compliance with IEEE and NETA standards for electrical testing
Main Applications
- Electrical substations and transformers
- Power circuit breakers, disconnect switches and reclosers
- Busbar joints and power cable splices
- Medium- and high-voltage equipment
- Grounding (earthing) systems and high-current industrial installations
Contact Resistance Testers
|
Model |
Brand |
Max. Current |
Resolution |
Measurement Range |
Weight |
Ideal For |
|
DLRO200 |
Megger |
200 A DC |
0.1 µΩ |
0.1 µΩ – 400 mΩ |
14.5 kg |
Substations, circuit breakers |
|
FRAX101 Micro Ohmmeter |
Fluke |
100 A DC |
1 µΩ |
1 µΩ – 250 mΩ |
10 kg |
Light/medium industry |
|
Micro Junior 200 |
ISA |
200 A DC |
0.1 µΩ |
0.1 µΩ – 500 mΩ |
9.8 kg |
Power equipment testing |
|
MPK-203e |
DV Power |
200 A DC |
0.1 µΩ |
0.1 µΩ – 200 mΩ |
8 kg |
Mobile substations |
|
Micro Ohm 100 |
Raytech |
100 A DC |
0.5 µΩ |
0.5 µΩ – 300 mΩ |
12 kg |
Maintenance testing |
Why Choose Creativeit Group as Your Technical Supplier?
Specialized field advice – We help you choose the ideal instrument for your application
Nationwide delivery
Complete solutions in electrical measuring equipment
With more than 30 years of experience, we are your technical partner for acquiring reliable, accurate and certified instruments.
Request Your Personalized Quote
Contact us to find the ideal model for your application, special volume pricing and immediate delivery options.
Creativeit Group – Precision That Protects Your Power.
We measure. We diagnose. We solve.
