{"product_id":"uni-t-ut625a-ut625b-100a-200a-low-resistance-ohmmeter-circuit-breaker-contact-resistance-tester","title":"UNI-T UT625A \/ UT625B 100A \/ 200A Low Resistance Ohmmeter – Circuit Breaker \u0026 Contact Resistance Tester","description":"\u003cp class=\"isSelectedEnd\"\u003eThe UNI-T UT625A and UT625B High Current Low Resistance Ohmmeters are professional test instruments designed for accurate contact resistance, loop resistance and high-current connection resistance measurement in substations, switchgear, rail networks, renewable energy systems and industrial electrical installations.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eAvailable in 100A (UT625A) and 200A (UT625B) versions, these instruments inject a controlled high DC test current through the device under test and use a 4-wire Kelvin measurement method to accurately determine very low resistance values down to 0.1μΩ resolution.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eThey are particularly suited for testing low , medium- and high-voltage circuit breakers, switchgear contacts, busbar joints, cable connections and other high-current electrical connections where even a small increase in resistance can indicate deterioration, contamination, loose connections or contact damage.\u003c\/p\u003e\n\u003cp\u003eWith a 7-inch colour display, built in thermal printer, PASS\/FAIL comparison testing, 200-record storage and PC software connectivity, the UT625 series provides a complete field solution for commissioning, preventative maintenance and asset-condition testing.\u003c\/p\u003e\n\u003ch2\u003eDesigned for Circuit Breaker Contact Resistance Testing\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003eElectrical contacts within circuit breakers and switchgear carry very high currents during normal operation.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eOver time, contact resistance can increase due to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContact wear\u003c\/li\u003e\n\u003cli\u003eOxidation\u003c\/li\u003e\n\u003cli\u003eContamination\u003c\/li\u003e\n\u003cli\u003eMechanical deterioration\u003c\/li\u003e\n\u003cli\u003eLoose connections\u003c\/li\u003e\n\u003cli\u003eContact misalignment\u003c\/li\u003e\n\u003cli\u003eArcing damage\u003c\/li\u003e\n\u003cli\u003ePoor installation or assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003eAn increase in resistance can cause localised heating, power loss and potentially premature equipment failure.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eThe UT625A\/UT625B injects a controlled high DC current through the contact and measures the resulting voltage drop to accurately calculate the contact resistance.\u003c\/p\u003e\n\u003cp\u003eThis provides maintenance teams with a practical way to assess the condition of critical high-current electrical connections.\u003c\/p\u003e","brand":"CHK Shop","offers":[{"title":"100A","offer_id":44450908536897,"sku":"UT625A","price":2645.0,"currency_code":"AUD","in_stock":true},{"title":"200A","offer_id":44450908569665,"sku":"UT625B","price":4405.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0660\/6667\/7825\/files\/UT625A.png?v=1787207942","url":"https:\/\/www.chkshop.com.au\/products\/uni-t-ut625a-ut625b-100a-200a-low-resistance-ohmmeter-circuit-breaker-contact-resistance-tester","provider":"CHK Shop","version":"1.0","type":"link"}