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HF-WC-629 Switch Contact Resistance Tester
Switch Contact Resistance Tester adopts DC four-wire testing method to accurately measure contact resistance of circuit breakers, disconnectors and high-voltage switches. It effectively detects contact oxidation, poor contact and loose joints, widely used for factory acceptance, substation commissioning and routine maintenance of power equipment.
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HF-WC-629 Switch Contact Resistance Tester is a high-precision digital testing instrument independently developed in compliance with relevant standards and national specifications. Adopting sine wave inverter and high-power constant-current switching power supply technology, it measures micro-ohm level contact resistance. It is widely used to test contact resistance of switches and electrical appliances, loop resistance, cable wire resistance and welding seam contact resistance.
Performance Features
- Large test current, meeting national standards for contact resistance testing.
- High output voltage with complete measuring range.
- High-precision high-current constant current source, no manual adjustment required, enabling rapid and accurate measurement.
- Four-terminal wiring method effectively eliminates the influence of test lead resistance on measuring results.
- Fast testing speed with high measurement precision and stability.
- Equipped with 800×480 resolution color capacitive touch LCD screen, all operations displayed in Chinese for easy operation.
- Supports real-time printing of test data.
- Built-in clock and data storage function for convenient query and management of test records.
Technical Specifications
| Item | Parameter |
|---|---|
| Test Current | 4 selectable gears: 50A / 100A / 150A / 200A |
| Measuring Range | 0 ~ 50mΩ |
| Resolution | Minimum 0.1μΩ |
| Accuracy | ±(0.5%FS + 2 digits) |
| Measurement Mode | Quick / Timed measurement (Quick: 2s, 4s, 6s) |
| Working Power Supply | AC220V±10%, 50Hz |
| Operating Temperature | -10 ~ 40℃ |
| Relative Humidity | ≤80%, no condensation |
Applications
The Contact Resistance Tester is used to measure micro-ohm contact resistance of high-voltage circuit breakers, disconnectors, busbar joints and welding seams. It detects poor contact, oxidation and loose connections, widely applied in substation commissioning, power equipment overhaul and factory acceptance tests.
Adopting the four-terminal Kelvin measurement method, it eliminates interference from test lead resistance and delivers stable and precise readings. Multiple test current options and flexible timing modes satisfy various on-site test requirements. Equipped with data storage and real-time printing functions, this HF-WC-629 model offers intuitive touch operation for efficient field diagnosis of power switching equipment.
Packing List
| Description | Qty | Unit |
|---|---|---|
| HF-WC-629 Switch Contact Resistance Tester Main Unit | 1 | Pc |
| High Current Test Cables & Clamps | 1 | Set |
| AC Power Cord | 1 | Pc |
| Operation Manual (Chinese & English) | 1 | Copy |
| Factory Calibration Certificate | 1 | Copy |
| Export Protective Foam & Carton | 1 | Set |
FAQ for Contact Resistance Tester
Q1: What measuring principle does this tester adopt?
A: It uses the DC four-terminal (Kelvin) testing method, which effectively removes the resistance interference from test leads and ensures accurate micro-ohm measurement.
Q2: What current ranges are available for selection?
A: Four adjustable current gears: 50A, 100A, 150A and 200A, complying with relevant national test standards for contact resistance.
Q3: What is the measurement range and resolution?
A: Measuring range: 0~50mΩ; minimum resolution: 0.1μΩ, suitable for precise testing of low-resistance contacts.
Q4: Can the instrument store and print test data?
A: Yes. It supports real-time data printing, and comes with clock & data storage functions for convenient record inquiry and management.
Q5: What devices can this tester be used to test?
A: It applies to circuit breakers, disconnectors, busbar joints, cable connections and welding seams to check contact defects such as oxidation and loose joints.
Q6: Are multiple measurement modes supported?
A: It provides quick measurement and timed measurement options with selectable durations of 2s, 4s and 6s to meet different testing requirements.
Q7: What power supply does the instrument require?
A: Working power supply: AC220V±10%, 50Hz. Operating temperature ranges from -10℃ to 40℃, humidity ≤80% without condensation.
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