Dold Monitoring Relay 3 Phase SPDT DIN Rail 230 V 400V AC RK9871.71 3/N AC400/230V 50/60Hz

The Dold RK9871.71 3/N AC400/230V 50/60Hz Monitoring Relay is a highly reliable device engineered for accurate detection of undervoltage across 3-phase electrical systems. With a single-pole double-throw (SPDT) contact configuration and DIN rail mounting, this relay ensures seamless integration into electrical panels and industrial automation setups.

This relay operates without requiring a separate auxiliary voltage, deriving internal supply directly from the three phases. It is equipped with clear LED indicators that display operation voltage status and contact position, facilitating easy monitoring and troubleshooting.

Designed for safety and reliability, the relay is de-energised upon fault trip, preventing potential damage and ensuring higher safety standards in building installations and industrial environments.

It features a fixed 0.5-second time delay for fault signaling and a 1-minute fixed reset time delay, allowing reliable and timely fault management. The unit employs screw terminals for durable and secure electrical connections, suitable for diverse industrial applications requiring robust mounting via DIN rails.

With compact dimensions (66 mm length, 90 mm height, and 17.5 mm width), it fits standard control cabinets efficiently. The monitoring relay supports a switching voltage of 230 V AC and supply voltages of 230 and 400 V AC, with an operating temperature range up to 55°C and IP20/ IP40 ratings for protection against dust and contact.

The device carries a contact current rating of 4A with 1 changeover contact configuration, meeting CE and RoHS compliance standards, reflecting its quality and environmental considerations. Manufactured in Germany, it serves applications in electrical monitoring, automation, and control systems within industrial, commercial, and building infrastructure.

Detects undervoltage in 3-phase voltage systems without separate auxiliary voltage supply. Equipped with LED indication for operation voltage and contact position. De-energised on trip to enhance safety in building applications.

Features a fixed time delay of 0.5 seconds for fault indication and 1 minute for reset. Utilises screw terminals for secure electrical connections. Compact DIN rail mount with dimensions 66mm length, 90mm height, and 17.5mm width.

Rated for 230 V switching voltage and supply voltages of 230 V and 400 V AC. Operating temperature range up to 55°C with protection ratings IP20 and IP40. Provides a contact current rating of 4A with 1 changeover contact.

Complies with CE and RoHS standards and is manufactured in Germany.

This monitoring relay is suitable for use in industrial electrical systems, factory automation, building safety systems, and condition monitoring setups requiring robust undervoltage detection and fault signaling. It is part of the RK 9871 series, renowned for quality and reliability.

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