Feeder protection relay REX 521

Basic protection of busbars and feeders in utility substations and industrial power distribution systems

Not active product since 2012

The feeder protection relay REX 521 is designed for protection, control, measuring and supervision in medium voltage networks and for protection of large or medium-size three-phase a.c. motors in circuit breaker controlled motor drives. Typical applications include incoming, outgoing feeders and motor feeders as well as substation protection. Further, the relay can, e.g., be applied as back-up protection of power transformers and back up for high-voltage line-protection relays.

The protection relay is provided with energizing inputs for conventional current and voltage transformers. Also a hardware version with inputs for current and voltage sensors is available.

The REX 521 Feeder Protection Relay has been further enriched with additional features to provide your electrical network with even more efficient protection, extended measuring functions, supervision, control functions and connectivity. The REX 521 is mainly used in single busbar solutions, using one circuit breaker for various protections.

With pre-made, standard configurations the unit can be used in different types of networks and the typical applications include incoming and outgoing feeders in radial isolated neutral, resonant earthed, solidly earthed and resistively earthed systems.

Scope

Protection, control, measuring and supervision in medium voltage networks and for protection of large or medium-size three-phase a.c. motors

Product benefits

Multi-functional protection

Product features

Energizing inputs for conventional current and voltage transformers
Version with inputs for current and voltage sensors is also available
Pre-made, standard configurations

About Us

✨ With 13 years of global supply experience, we bring you exceptional service.

🌍 We directly source authentic licensed products from abroad, ensuring competitive prices, reliable after-sale warranties, and an extensive selection of models backed by ample inventory.

💥 Contact us for orders of more than 1 product, and we’ll be delighted to offer you a discount.

🤔 Have questions or special requests? Feel free to get in touch with us.

💰 If you find the same parts at a lower price from other suppliers, we’ll match or beat that price.

🛠️ Need spare parts? Let us know, and we’ll gladly assist you further. Your inquiry is eagerly awaited.

📧 Contact Us

E-mail: [email protected]

🕒 Business Hours: 24/7

🏢 Address: No.601, Hongwen Liuli, Siming District, Xiamen, China

Recommended Products

Manufacturer	Model	Link
ABB	PM851	link
ABB	TP830	link
ABB	CMA 132 3DDE300412	link
ABB	DO880	link
ABB	07AC91	link
ABB	07KT97	link
ABB	PM861AK01	link
ABB	PM864AK01	link
ABB	07KT94	link
ABB	07KT95	link
ABB	07CR41	link
ABB	07DI92	link
ABB	07KP90	link
ABB	CI854AK01	link
ABB	CI858AK01	link