Ziehl UFR1001E Voltage and Frequency Relay for Grid-Connected Generation Systems

Reliable Anti-Islanding Protection for Solar PV and Distributed Energy Resources

The Ziehl UFR1001E is a precision voltage and frequency relay engineered to deliver anti-islanding protection for grid-connected generation systems. It continuously monitors voltage and frequency at the point of common coupling, ensuring immediate disconnection when grid parameters fall outside prescribed limits. This is essential for compliance with VDE-AR-N 4105:2018-11, VDE-AR-N 4110:2018-11, G98, G99, and ÖVE/ÖNORM E 8001-4-712:2009, making it a trusted component in solar PV installations, cogeneration plants, and other distributed energy resources across Australia and Europe.

Unlike generic monitoring relays, the UFR1001E uses true RMS measurement for accurate detection of over/under voltage, over/under frequency, vector shift, and rate of change of frequency (ROCOF). Its passive anti-islanding detection (per chapter 6.5.3 and appendix D2) reduces the risk of unintentional islanding, protecting both utility personnel and equipment from back-feed hazards. The wide auxiliary supply range of AC/DC 24-270V simplifies integration into diverse control circuits, while the two change-over relay contacts provide flexible interfacing with contactors or circuit breakers.

Key Features

• Comprehensive grid monitoring – voltage, frequency, vector shift, and ROCOF in one device
• True RMS measurement for high accuracy even with distorted waveforms
• Wide auxiliary supply – AC/DC 24-270V for versatile installation
• Adjustable setpoints and time delays to match local utility requirements
• Clear LCD display and LED indicators for real-time status and diagnostics
• Compact 6 TE DIN rail housing (90 x 105 x 69 mm) for space-efficient panel mounting
• IP30 / IP20 protection suitable for indoor control cabinets

Engineered for Compliance and Safety

Meeting stringent grid connection standards is non-negotiable for solar installers and system integrators. The UFR1001E is pre-certified to VDE-AR-N 4105 and G99, eliminating guesswork and reducing commissioning time. Its vector shift detection (<50 ms response) and ROCOF monitoring provide fast, reliable loss of mains detection, a critical requirement for embedded generation up to and beyond 30 kW. The adjustable hysteresis and switching delays allow fine-tuning to avoid nuisance tripping while maintaining grid stability.

For larger or three-phase systems, the UFR1001E can be paired with external contactors and a main circuit breaker. We also offer a pre-assembled Anti-Islanding Box 63A (single and three phase) that includes this relay, two in-line 63A contactors, and a main breaker—ready for immediate deployment.

Applications

• Solar PV systems – residential, commercial, and industrial grid-tied inverters
• Battery energy storage systems with grid export capability
• Cogeneration (CHP) plants and backup generators operating in parallel with the grid
• Wind and hydro turbines requiring grid synchronisation and protection
• EV charging infrastructure with vehicle-to-grid (V2G) functionality

Why Choose the Ziehl UFR1001E?

Selecting a certified anti-islanding relay reduces project risk by ensuring regulatory compliance from day one. The UFR1001E’s robust design and wide operating temperature range (-20°C to +55°C) make it suitable for Australian conditions, from coastal installations to inland heat. Its DIN rail mounting and clear terminal labelling speed up installation, while the digital display simplifies commissioning and fault finding.

With proven reliability in thousands of installations worldwide, the UFR1001E is a future-proof choice for grid-connected generation. Download the datasheet and certificates below for full technical details, or visit www.ziehl.de for additional documentation.

Add the Ziehl UFR1001E to your project today and ensure your grid-tied system meets the latest anti-islanding protection requirements with confidence.