ABB REX521 Feeder Protection Relay
$254.00
$521.00
What our customer's think
Reviews
Description
Overview
The REX 521 is a versatile protection relay designed to safeguard medium voltage networks, including feeders and motors. It offers a range of functions for protection, control, measuring, and supervision. The relay is ideal for incoming and outgoing feeders, motor feeders, and substation protection. Additionally, it serves as backup protection for power transformers and high-voltage line protection relays. This relay supports both conventional current and voltage transformers, as well as versions that can accommodate current and voltage sensors for added flexibility.
Technical Specifications
-
Protection Functions:
- Overcurrent protection (OC)
- Earth fault protection (EF)
- Over/under voltage protection (UV/OV)
- Directional overcurrent protection (DO)
- Thermal protection for motors
- Back-up protection for power transformers and line protection relays
-
Inputs:
- Energizing inputs for conventional current and voltage transformers
- Optional version with inputs for current and voltage sensors
-
Relay Types:
- Protection for large and medium-sized three-phase a.c. motors
- Feeder protection for incoming and outgoing feeders
- Suitable for solidly earthed, resistively earthed, and resonant earthed systems
-
Communication and Connectivity:
- Integrated communication interfaces for system integration
- Standard configurations for easy network compatibility
-
Operating Voltage:
- Nominal voltage: 24V DC, 48V DC, or 110V DC
-
Environment:
- Temperature range: -40°C to +70°C
- Humidity: 5% to 95% (non-condensing)
-
Mounting:
- Compact design for easy installation in medium voltage control panels
-
Certifications:
- Compliance with international standards for electrical protection systems (IEC 60255, IEC 61850)
-
Display and Indicators:
- LED indicators for status and fault conditions
- Optional LCD display for detailed information
-
Dimensions:
- Width: 160 mm
- Height: 250 mm
- Depth: 120 mm
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
Featured
Complementary products
Express Delivery
Fast shipping for your urgent needs.
Large Inventory
Extensive stock ensures quick availability.
Premium Quality
Genuine, high-grade PLC & DCS components.
24/7 Customer Support
Reliable service for clients worldwide.