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Time Mark B258B Three-Phase Power Monitor

This three-phase monitor relay detects phase loss, low voltage, and phase reversal, ensuring motor safety and reliable operation. It features a solid-state sensing circuit driving an electro-mechanical relay, which energizes under correct voltage and phase rotation. When faults occur, the relay de-energizes, providing a clear electrical signal. The device offers both automatic and manual reset options, does not require neutral connection, and is compatible with Wye or Delta systems. It is protected against transient voltage spikes up to 2500 V for 10 ms, and includes indicators for trip and normal conditions, making it vital for industrial power systems.

Authorized Distributors
Part No:B258B
Stock:7
Inv Date:06-11-2026
Price: Unit price: $142.26
Buy/RFQ:

Time Mark B258B Three-Phase Power Monitor Specifications:

  • Voltage Range: 110/120 VAC coil voltage
  • Contact Configuration: SPDT (1 Form C)
  • Contact Current Rating: Up to 10 Amps
  • Mounting: Plug-in 8-pin octal connector
  • Transient Voltage Protection: 2500 VAG for 10 ms
  • Response Time: 50 ms
  • Repeat Accuracy: +0.1% of set point
  • Operating Temperature: -40°F to 131°F
  • Enclosure Material: ABS plastic
  • Humidity Tolerance: 0-97% without condensation
  • Agency Approvals: UL Recognized and CSA Certified

Buy the Buy Time Mark Model 258B 3-Phase Monitor Part Number B258B Online

Purchase the Time Mark Model 258B online today for comprehensive three-phase power monitoring. Designed to detect voltage irregularities, phase loss, and reversals, it offers reliable protection for industrial motors and equipment. With a robust SPDT contact rated for 10 Amps, quick response time, and durable ABS enclosure, this device ensures safety and operational continuity. Easy to install via a plug-in 8-pin socket, the Model 258B also features manual and automatic reset options, backed by a five-year unconditional warranty for peace of mind in demanding environments.

Get Time Mark Model 258B today—reliable for phase loss detection, reversed phase detection, and low voltage monitoring with long-lasting durability.

Frequently Asked Questions

Where can I buy Time Mark B258B?

You can click on the BUY or RFQ button to purchase B258B from an authorized Time Mark distributor.

How do I troubleshoot issues or seek technical support for part B258B?

You can download the B258B datasheet or visit the Time Mark website for support.

Who is the manufacturer of B258B?

Time Mark

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