{"product_id":"time-mark-corp-a258b-phase-monitoring-relay-380-480vac-10a-spdt-240vac-8-pin","title":"Time Mark Corp A258B Phase Monitoring Relay 380-480VAC, 10A, SPDT, 240VAC 8 Pin","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\" class=\"PDq2pG_selectionAnchorContainer\"\u003eDescription:\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp data-start=\"17\" data-end=\"675\"\u003eThe Time Mark Corporation A258B Phase Monitoring Relay is designed to continuously monitor 380–480 VAC three-phase power systems for phase loss, phase reversal, and undervoltage conditions to protect motors and critical industrial equipment. Commonly installed in motor control centers, pumps, compressors, HVAC systems, conveyors, and manufacturing machinery where reliable three-phase power monitoring is essential for safe operation. Maintenance teams, OEMs, and system integrators use the A258B for replacement, repair, retrofit, and preventive maintenance to minimize equipment damage and reduce unplanned downtime. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"677\" data-end=\"694\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"695\" data-end=\"1291\"\u003eThe Time Mark A258B is a solid-state three-phase monitoring relay that continuously supervises Wye or Delta power systems without requiring a neutral connection and de-energizes its output relay whenever phase loss, phase reversal, or undervoltage conditions are detected. It is widely used in industrial automation systems, water and wastewater facilities, motor control panels, compressors, conveyors, HVAC equipment, and process machinery where dependable three-phase power monitoring helps prevent costly electrical failures and production interruptions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1293\" data-end=\"1322\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1323\" data-end=\"2192\"\u003e• Manufacturer: Time Mark Corporation\u003cbr data-start=\"1360\" data-end=\"1363\"\u003e• Manufacturer Part Number (MPN): A258B\u003cbr data-start=\"1402\" data-end=\"1405\"\u003e• Product Type: 3-Phase Monitoring Relay\u003cbr data-start=\"1445\" data-end=\"1448\"\u003e• Nominal Voltage: 380–480 VAC (Phase-to-Phase)\u003cbr data-start=\"1495\" data-end=\"1498\"\u003e• Voltage Adjustment Range: 380–480 VAC\u003cbr data-start=\"1537\" data-end=\"1540\"\u003e• Frequency: 60 Hz\u003cbr data-start=\"1558\" data-end=\"1561\"\u003e• Power Consumption: 3.7 W\u003cbr data-start=\"1587\" data-end=\"1590\"\u003e• Phase Sensing: Phase Loss and Phase Reversal\u003cbr data-start=\"1636\" data-end=\"1639\" data-is-only-node=\"\"\u003e• Voltage Protection: Undervoltage Monitoring\u003cbr data-start=\"1684\" data-end=\"1687\"\u003e• Output Contacts: SPDT, 10 A at 240 VAC Resistive\u003cbr data-start=\"1737\" data-end=\"1740\"\u003e• Mounting: 8-Pin Plug-In Socket\u003cbr data-start=\"1772\" data-end=\"1775\"\u003e• Automatic Reset: Yes\u003cbr data-start=\"1797\" data-end=\"1800\"\u003e• Repeat Accuracy: ±0.1% of Set Point\u003cbr data-start=\"1837\" data-end=\"1840\"\u003e• Response Time: 50 ms Dropout\u003cbr data-start=\"1870\" data-end=\"1873\"\u003e• Dead Band: Approximately 2%\u003cbr data-start=\"1902\" data-end=\"1905\"\u003e• Enclosure Material: ABS Plastic\u003cbr data-start=\"1938\" data-end=\"1941\"\u003e• Operating Temperature: -20°F to +131°F (-29°C to +55°C)\u003cbr data-start=\"1998\" data-end=\"2001\"\u003e• Certifications: UL Recognized, CSA Certified\u003cbr data-start=\"2047\" data-end=\"2050\"\u003e• Application: Three-phase motor, compressor, pump, conveyor, HVAC, and industrial equipment protection. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2194\" data-end=\"2218\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2219\" data-end=\"2278\"\u003e• Time Mark A258BM\u003cbr data-start=\"2237\" data-end=\"2240\"\u003e• Time Mark EX258B\u003cbr data-start=\"2258\" data-end=\"2261\"\u003e• Time Mark A257B\u003c\/p\u003e","brand":"Time","offers":[{"title":"New","offer_id":51714028536110,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_0bb55be2-6501-4e13-a374-f91f28e7b6eb.jpg?v=1770414244","url":"https:\/\/plgautomation.com\/products\/time-mark-corp-a258b-phase-monitoring-relay-380-480vac-10a-spdt-240vac-8-pin","provider":"PLG Automation ","version":"1.0","type":"link"}