{"product_id":"156070","title":"Model 258 Tester 258B Monitor","description":"\u003cp\u003e3phase Tester w\/industrial-grade 3-phase power monitor relay designed to continuously safeguard electrical motors and systems against abnormal power line conditions. It effectively detects faults such as phase loss, phase reversal, and low voltage\/under-voltage conditions, ensuring equipment remains undamaged by poor power quality.Core FunctionalityAdvanced Phase Sensing: Uses a solid-state voltage and phase-angle sensing circuit to protect equipment.Regenerated Voltage Detection: Detects complete phase loss on a loaded motor, even if the spinning motor recreates a ghost\/regenerated voltage on the missing phase.Relay Output: Drives an electromechanical Single-Pole Double-Throw (SPDT) relay rated for 10 Amps at 240VAC.Operation Behavior: The internal relay energizes under healthy power conditions and de-energizes (drops out) within 50ms when a fault occurs.Universal Compatibility: Requires no neutral connection and works seamlessly on both Wye and Delta configurations.Model Variations \u0026amp; SpecificationsThe 258 Series uses color-coded outer ABS plastic enclosures to represent different voltage and operating parameters.ModelNominal VoltageCase ColorFrequencyAdjustment RangeB258B \/ B258BM120 VACGray60 Hz85–120 VAC258B \/ 258BM208\/240 VACRed60 Hz160–240 VAC\u003c\/p\u003e","brand":"TIME MARK CORPORATION","offers":[{"title":"Default Title","offer_id":45782523805749,"sku":null,"price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0219\/7936\/5440\/files\/AP1GczO21hfn6CVk93RUXHLXjgQKZoaear6MOfqsk4OpwKadb1gquS7GK1f4lXBPl1H9rZl01K4XAjfZnki9utQ-9FU8veBwbeFuvrrzoed5kVsyaa4CZSTjlhjup_Xt4L9pcE0T7BIx9YYiSAf4TXu33-X1nA_w1584-h1584-s-no-gm.jpg?v=1784331033","url":"https:\/\/greenbrookonline.com\/products\/156070","provider":"Green Brook Online","version":"1.0","type":"link"}