Dold 3 Phase DPDT DIN Rail Monitoring Relay RK9871.72 3/N AC400/230V 50/60Hz

Dold RK9871.72 3/N AC400/230V 50/60Hz is a professional-grade monitoring relay designed for three-phase undervoltage detection and emergency supply control in electrical systems. It features a double pole double throw (DPDT) contact configuration housed in a compact DIN rail mount enclosure, making it ideal for seamless integration into industrial control panels.

The relay internally derives its supply voltage from all three phases, eliminating the need for an auxiliary power supply and enhancing operational reliability. LED indicators provide clear visual feedback on operation voltage presence and contact status, facilitating straightforward monitoring and troubleshooting.

This model includes a fixed delay response of 0.5 seconds for fault indication and a 1-minute reset delay, ensuring stable operation without nuisance tripping. Rated for a switching voltage of 230V AC and compatible with a supply voltage range of 230 to 400V AC, it supports a contact current of 4A, suitable for a wide range of industrial and commercial applications.

The relay is manufactured to comply with CE and RoHS standards, reflecting a commitment to high safety and environmental standards. It is constructed with a screw terminal type connection and an IP rating of IP40 and IP20, protecting against dust and solid ingress in typical industrial environments.

Its compact dimensions (width 17.5mm, length 66mm, height 90mm) allow it to fit neatly into DIN rail mounting systems, saving valuable space in electrical enclosures. Operating temperature ranges support reliable usage up to +55°C.

This monitoring relay is well suited for applications such as industrial automation, manufacturing, building electrical installations, and any setup requiring undervoltage protection and emergency supply switch over in three-phase systems.

Undervoltage detection in 3-phase electrical systems. Emergency supply switch over functionality. DPDT contacts for versatile switching needs. DIN rail mount for easy panel integration. LED status indication for operation and contacts.

Fixed response and reset delay for stable operation. CE and RoHS compliant for safety and environmental standards. Compact size supporting space-efficient installation. Screw terminal connection type for secure wiring.

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