ABB CM-UFD.M32 multifunctional grid feeding monitoring relay designed to CEI 0-21 with 24-240 V AC/DC supply, 0-540 V AC measuring range and three changeover relay outputs.
The ABB 1SVR510730R4400, also known as the CM-UFD.M32, is a multifunctional grid feeding monitoring relay developed for renewable energy installations requiring reliable interface protection between distributed power generation systems and the public electricity grid. It continuously monitors voltage and frequency conditions to ensure grid compliance and safe operation.
Designed in accordance with the CEI 0-21 grid connection standard, the CM-UFD.M32 supervises critical electrical parameters including overvoltage, undervoltage, overfrequency, underfrequency, vector shift and rate of change of frequency (ROCOF). When an abnormal grid condition is detected, the relay activates external switching equipment to disconnect the generating installation safely from the network.
Featuring a 0-540 V AC phase-to-phase measuring range, a 24-240 V AC/DC universal control supply and three changeover relay outputs, the CM-UFD.M32 is ideal for photovoltaic systems, embedded generation and industrial renewable energy installations requiring dependable grid interface monitoring. Although now discontinued, it remains widely used in existing renewable energy systems.
The ABB CM-UFD.M32 continuously measures voltage and frequency on the public electricity network, ensuring connected renewable energy systems operate only within permitted limits. When abnormal conditions occur, the relay changes the state of its outputs to operate external contactors, switch-disconnectors or circuit breakers, protecting both the generating installation and the electrical grid.
Its comprehensive monitoring functions make it suitable for photovoltaic systems, distributed generation and industrial renewable energy installations where dependable interface protection is essential for safe grid connection.
| Manufacturer | ABB |
|---|---|
| Series | CM-UFD |
| Model | CM-UFD.M32 |
| Product ID | 1SVR510730R4400 |
| Product type | Grid feeding monitoring relay |
| Applicable standard | CEI 0-21 |
| Rated control supply | 24-240 V AC/DC |
| Phase-to-phase measuring range | 0-540 V AC |
| Phase-to-neutral measuring range | 0-312 V AC |
| Output contacts | 3 changeover contacts |
| Mounting type | DIN rail mounting |
| Terminal type | Screw terminals |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 90 × 108 × 67 mm |
| Net weight | approx. 1.0 kg |
| EAN | 4016779907163 |
| HS Code | 85364900 |
The CM-UFD.M32 provides interface protection between renewable energy systems and the public electricity grid by monitoring voltage and frequency conditions.
The CM-UFD.M32 is designed for applications requiring compliance with the CEI 0-21 grid connection standard.
The relay operates from a universal 24-240 V AC/DC control supply.
The relay features three changeover relay outputs for controlling external switching or decoupling devices.
The CM-UFD.M32 has been discontinued by ABB, although it remains installed in many existing renewable energy systems and may still be available through specialist stockists.
ABB CM-UFD monitoring relays have been widely used by renewable energy installers and electrical engineers to provide dependable interface protection and reliable grid monitoring for distributed generation systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...