Phase Sequence Relay for Three-Phase Power Safety [Instant Fault Detection]

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Phase Sequence Relay: Three-Phase Power Safety Monitor for Phase Sequence and Fault Detection

Phase Sequence Relay: Three-Phase Power Safety Monitor for Phase Sequence and Fault Detection

The phase sequence relay detects the phase sequence of three-phase power supplies, sending signals or cutting off circuits when phase sequence errors (reversed phases) or phase loss occur. It ensures correct motor rotation direction and prevents equipment damage from phase sequence issues in three-phase motor systems, power transformers, and industrial equipment. This relay is essential for three-phase power safety, avoiding operational failures and accidents caused by phase-related faults.
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Advantages

Instant Phase Fault Detection

Identifies phase sequence errors or loss within 200ms, triggering alarms or shutdowns to prevent motor reverse rotation and damage.

Self-Calibrating Phase Detection

Automatically adapts to different voltage waveforms, eliminating the need for manual configuration in diverse power environments.

Dry Contact Outputs

Provides NO/NC relay contacts for easy integration with PLCs, HMIs, or alarm systems, enabling remote monitoring of phase status.

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These 3-phase phase failure relays are dedicated to 3-phase motor protection. They are micro-processor based and detect phase loss, unbalance, and reverse sequence. With adjustable trip settings, thermal memory, greater than or equal to 2s rapid fault response time, and Modbus, they are guaranteed to comply with IEC 61557-8, ensuring critical applications like water treatment plants are protected.

Frequently Asked Questions

How quickly does a phase sequence relay detect phase faults?

A phase sequence relay identifies phase sequence errors or loss within 200ms, triggering alarms or shutdowns to prevent motor reverse rotation and damage. This rapid detection is critical for protecting three-phase motors in industrial equipment and power systems.
The phase sequence relay supports universal three-phase voltage systems (200-500V AC), making it compatible with global power standards (220V/380V/440V). This versatility allows seamless use in international projects or multi-voltage environments.
No, the phase sequence relay features self-calibrating phase detection, automatically adapting to different voltage waveforms without manual configuration. This simplifies installation in diverse power environments, reducing setup time and errors.
The phase sequence relay provides dry contact outputs (NO/NC relay contacts) for easy integration with PLCs, HMIs, or alarm systems. This enables remote monitoring of phase status and centralized control in smart industrial networks.
The phase sequence relay features a compact DIN rail mount with a 35mm width, saving space in control panels. This design is ideal for retrofitting into existing three-phase motor systems or optimizing panel layouts in new installations.

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Customer Reviews

David Chen
Critical for Preventing Motor Damage

"In our manufacturing plant, a phase sequence error once caused a motor to run backward, damaging expensive machinery. These relays now alert us instantly to any phase issues, with both visual alarms and circuit shutdowns. The self-calibrating feature worked seamlessly when we upgraded our power supply from 380V to 440V, and the compact DIN rail design saved space in our crowded switchgear. Essential for three-phase motor protection."

James Anderson
Essential Phase Sequence Relay for Equipment Safety

The phase sequence relay is vital for ensuring the correct phase sequence in our three-phase power systems. It quickly detects phase errors and missing phases, preventing equipment damage. Its simple setup and reliable performance give us peace of mind. A must-have for any system using three-phase power.

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Compact Din Rail Mount

Compact Din Rail Mount

35mm width for space-saving installation in control panels, ideal for retrofitting into existing three-phase motor systems.
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Yueqing Huilong provides advanced industrial control appliances and relays for global markets. Our ISO-9001 certified products ensure quality and reliability. Contact us today!

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