K8DS-PH1

Product Description

Home > Products > Omron > Relays & Timers > K8DS-PH1 Need Omron K8DS-PH1? Protective Relay for Three-phase power systems. Supplied with full traceability and documentation. Request a quote and current... Price & Availability Contact us for pricing / 询价 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 How do I set the operating voltage range on the K8DS-PH1? The K8DS-PH1 has a fixed operating voltage range of 200-480 VAC. There is no need to set the voltage range manually; the relay automatically adapts to the supply voltage within this range. However, you can adjust the reset delay (0.1 to 30 seconds) using the front dial to prevent nuisance tripping during momentary voltage dips. The phase sequence detection is automatic, and the relay will indicate the status via the LED. Can the K8DS-PH1 be used with a 230 VAC three-phase system? Yes, the K8DS-PH1 is designed for three-phase systems with line-to-line voltages from 200 to 480 VAC. A 230 VAC system (common in Europe) falls within this range. For lower voltage systems (e.g., 110 VAC), you would need a different model like the K8DS-PH2 (100-240 VAC). Always verify the supply voltage matches the relay's rated range before installation. What is the response time of the K8DS-PH1 when a phase is lost? The response time for phase loss detection is typically ≤ 0.5 seconds. For phase sequence errors, the response time is ≤ 0.1 seconds. This fast response ensures that the motor is quickly disconnected from the supply to prevent damage. The relay has an adjustable reset delay (0.1 to 30 seconds) to allow for automatic restart after a momentary fault, if desired. What is the difference between phase sequence and phase loss protection? Phase sequence protection ensures that the three phases (R, S, T) are connected in the correct order (positive sequence) so that the motor rotates in the intended direction. If the sequence is reversed, the motor will rotate backwards, which can damage equipment. Phase loss protection detects when one of the three phases is missing (e.g., due to a blown fuse or broken wire). A motor running on two phases can overheat and fail. The K8DS-PH1 monitors both conditions and trips the output relay if either occurs. 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