{"product_id":"time-mark-a258b-3-phase-power-monitor-relay-440-480-vac-60hz","title":"Time Mark A258B 3-Phase Power Monitor Relay 440-480 VAC 60hz","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=\"682\"\u003eThe Time Mark Corporation A258B \u003ca href=\"https:\/\/plgautomation.com\/collections\/safety-components\"\u003e3-Phase Power\u003c\/a\u003e Monitor Relay is designed to monitor 440–480 VAC three-phase power systems for phase loss, phase reversal, and undervoltage conditions, helping protect motors and industrial equipment from damaging power abnormalities. Commonly installed in motor control centers, HVAC systems, pumps, compressors, conveyors, and manufacturing machinery where reliable three-phase voltage monitoring is essential. Maintenance teams, OEMs, and system integrators use the A258B for replacement, repair, retrofit, and preventive maintenance to improve system reliability and reduce unplanned downtime. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"684\" data-end=\"701\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"702\" data-end=\"1304\"\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 automatically de-energizes its output relay whenever phase loss, phase reversal, or undervoltage conditions occur. It is widely used in industrial automation, water and wastewater facilities, HVAC equipment, motor control panels, compressors, conveyors, and other critical industrial applications where dependable three-phase power protection minimizes equipment damage and production interruptions. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1306\" data-end=\"1335\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1336\" data-end=\"2314\"\u003e• Manufacturer: Time Mark Corporation\u003cbr data-start=\"1373\" data-end=\"1376\"\u003e• Manufacturer Part Number (MPN): A258B\u003cbr data-start=\"1415\" data-end=\"1418\"\u003e• Product Type: 3-Phase Power Monitor Relay\u003cbr data-start=\"1461\" data-end=\"1464\"\u003e• Series: 258 Series\u003cbr data-start=\"1484\" data-end=\"1487\"\u003e• Nominal Voltage: 440–480 VAC (480 VAC Class)\u003cbr data-start=\"1533\" data-end=\"1536\"\u003e• Voltage Adjustment Range: 380–480 VAC\u003cbr data-start=\"1575\" data-end=\"1578\"\u003e• Frequency: 60 Hz\u003cbr data-start=\"1596\" data-end=\"1599\"\u003e• Monitoring Functions: Phase Loss, Phase Reversal, Undervoltage Protection\u003cbr data-start=\"1674\" data-end=\"1677\" data-is-only-node=\"\"\u003e• Output Contacts: SPDT, 10 A at 240 VAC Resistive\u003cbr data-start=\"1727\" data-end=\"1730\"\u003e• Power Consumption: 3.7 W\u003cbr data-start=\"1756\" data-end=\"1759\"\u003e• Response Time: 50 ms\u003cbr data-start=\"1781\" data-end=\"1784\"\u003e• Repeat Accuracy: ±0.1% of Set Point\u003cbr data-start=\"1821\" data-end=\"1824\"\u003e• Dead Band: Approximately 2%\u003cbr data-start=\"1853\" data-end=\"1856\"\u003e• Reset: Automatic\u003cbr data-start=\"1874\" data-end=\"1877\"\u003e• Mounting: 8-Pin Plug-In Socket\u003cbr data-start=\"1909\" data-end=\"1912\"\u003e• Indicators: TRIP and NORM LEDs\u003cbr data-start=\"1944\" data-end=\"1947\"\u003e• Wye\/Delta Compatible: Yes (No Neutral Required)\u003cbr data-start=\"1996\" data-end=\"1999\"\u003e• Operating Temperature: -20°F to +131°F (-29°C to +55°C)\u003cbr data-start=\"2056\" data-end=\"2059\"\u003e• Enclosure Material: ABS Plastic\u003cbr data-start=\"2092\" data-end=\"2095\"\u003e• Certifications: UL Recognized, CSA Certified\u003cbr data-start=\"2141\" data-end=\"2144\"\u003e• Application: Three-phase motor protection, industrial control systems, HVAC, pumps, compressors, conveyors, and process equipment. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2316\" data-end=\"2340\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2341\" data-end=\"2398\"\u003e• Time Mark A258BM\u003cbr data-start=\"2359\" data-end=\"2362\"\u003e• Time Mark B258B\u003cbr data-start=\"2379\" data-end=\"2382\"\u003e• Time Mark A269\u003c\/p\u003e","brand":"Time","offers":[{"title":"Used Surplus - Excellent Condition","offer_id":51714028077358,"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_5e53b32e-1bd7-437c-88b7-cd4b2efc9cf4.jpg?v=1770414230","url":"https:\/\/plgautomation.com\/products\/time-mark-a258b-3-phase-power-monitor-relay-440-480-vac-60hz","provider":"PLG Automation ","version":"1.0","type":"link"}