Contact Resistance Testers — 100 A

Download HVEX 100 A Contact Resistance Tester datasheet (English, PDF)

Request a Quote50 A and 100 A contact-resistance testing for electrical connections. Atlas Energy supplies the HVEX 100 A micro-ohmmeter for measuring low resistance in circuit breaker contacts, disconnect switches, reclosers, busbars, and other conductive connections. Measurements support commissioning and maintenance by helping identify loose, contaminated, corroded, or deteriorated contacts that can contribute to heating and energy loss.

Four-wire measurement

The tester applies a controlled current and measures the resulting voltage drop to calculate contact resistance. A four-wire connection separates current injection from voltage sensing, minimizing the effect of test-lead resistance on the result. The measured resistance is calculated and displayed automatically.

Verified specifications

• Selectable test current: 50 A or 100 A.

• Resistance measurement range: 1–9,999 µΩ.

• Resolution: 0.01 µΩ.

• Published accuracy: 0.5% ±0.5 µΩ.

• Maximum output voltage: 5 V.

• Power supply: 220 V AC ±10%, 50/60 Hz.

• Power consumption: ≤500 W.

• Operating temperature: −20 to +40 °C (−4 to +104 °F).

• Relative humidity: ≤80%, without condensation.

Applications

• Routine and maintenance tests on circuit breakers and disconnect switches.

• Contact and connection checks on reclosers and busbars.

• Comparison of measured resistance before and after connection maintenance.

• Field and laboratory testing with a portable case and straightforward controls.

Select the appropriate test setup

HVEX lists ABNT NBR 6814, IEC 60228, IEC 60947-2, IEC 62271-100, IEC 62271-102, and IEC 62271-111 among the product application references. Define the test current, connection method, and acceptance limits for the equipment being evaluated. Contact Atlas Energy to confirm the HVEX test set, leads, and supply requirements for your application.