Omron Protective Relay K8DS-PH1

Product Description

It continuously monitors the phase rotation order and the presence of all three phases, ensuring that motors operate safely and reliably. This relay is part of Omron's K8DS series, which is known for its high reliability, easy setup, and space-saving design. The K8DS-PH1 operates over a wide supply voltage range of 200 to 480 VAC, making it suitable for various industrial applications across different regions. Key features include a built-in self-test function that allows for quick verification of relay operation without disconnecting wiring, and an LED indicator that provides clear status feedback. The relay offers a SPDT (Single Pole Double Throw) output contact rated at 5 A at 250 VAC, suitable for directly switching contactor coils or signaling PLCs. The device is housed in a slim, DIN-rail mountable enclosure (22.5 mm wide) that saves valuable panel space. Its operating temperature range of -20°C to 60°C ensures reliable performance in demanding industrial environments. The K8DS-PH1 is engineered to meet international safety standards, including UL, CSA, and CE, ensuring compliance for global use. It is an ideal choice for protecting motors in pumps, fans, compressors, conveyors, and other three-phase equipment where phase failure or incorrect phase sequence could lead to equipment damage or operational hazards. With its straightforward wiring and adjustable settings, the K8DS-PH1 simplifies installation and reduces downtime, making it a trusted component in automation and control panels. The Omron K8DS-PH1 is a compact, multifunctional phase sequence and phase loss relay designed to protect three-phase induction motors from incorrect phase sequencing and phase loss conditions.

Basic Product Information

• Wide operating voltage range: 200-480 VAC
• SPDT output relay rated 5 A at 250 VAC
• Built-in self-test function for easy verification
• LED status indicator for power and relay operation
• Compact 22.5 mm DIN-rail mountable housing
• Operating temperature range: -20°C to 60°C
• Complies with UL, CSA, CE, and other international standards
• Monitors phase sequence and phase loss in three-phase systems

Technical Specifications

Version & Model Difference

The K8DS-PH1 is part of Omron's K8DS series, which includes various models for different monitoring functions. The K8DS-PH1 specifically focuses on phase sequence and phase loss. Other models in the series include K8DS-PZ (phase sequence, phase loss, and asymmetry), K8DS-PM (phase sequence, phase loss, and under/over voltage), and K8DS-PA (phase sequence, phase loss, and under/over current). The K8DS-PH1 is the basic version without additional voltage or current monitoring. It is designed for applications where only phase sequence and phase loss protection are required. The K8DS series also offers variants with different supply voltage ranges (e.g., 100-240 VAC, 380-480 VAC) and output configurations (SPDT vs. DPDT). The K8DS-PH1 is the standard model with a 200-480 VAC supply and SPDT output.

Application Scenarios