ABB CM-UFD.M33M multifunction grid feeding monitoring relay with Modbus RTU communication, G99 compliant protection functions and comprehensive voltage and frequency monitoring for renewable energy installations.
£935.66
The ABB CM-UFD.M33M is a multifunctional grid feeding monitoring relay designed to provide reliable interface protection between renewable energy generation systems and the public electricity grid. Engineered for photovoltaic systems, wind turbines, battery storage installations and other distributed energy resources, it continuously monitors grid voltage and frequency to ensure safe and compliant operation.
The relay incorporates advanced monitoring functions including overvoltage, undervoltage, overfrequency, underfrequency, ROCOF (Rate of Change of Frequency), vector shift detection and interrupted neutral monitoring. When abnormal grid conditions are detected, the relay signals external switching devices to safely disconnect the generating plant, helping protect equipment and maintain grid stability.
Designed to meet modern renewable energy requirements, the CM-UFD.M33M features a Modbus RTU communication interface, integrated LCD display, configurable protection settings and pre-configured profiles supporting G98/1 and G99/1 grid connection requirements, making it ideal for commercial and industrial renewable energy installations.
The ABB CM-UFD.M33M continuously supervises the quality and stability of the public electricity network, ensuring renewable energy installations disconnect rapidly whenever voltage or frequency moves outside permitted limits. This protects both grid infrastructure and generating equipment whilst supporting safe reconnection once stable operating conditions return.
Its comprehensive protection functions, communication capability and flexible configuration make the relay suitable for photovoltaic systems, battery energy storage, combined heat and power installations and wind generation projects requiring dependable grid interface protection.
| Manufacturer | ABB |
|---|---|
| Series | CM-UFD |
| Model | CM-UFD.M33M |
| Product type | Grid feeding monitoring relay |
| Communication | Modbus RTU |
| Monitoring functions | Voltage, frequency, ROCOF, vector shift, interrupted neutral |
| Voltage measuring range | L-N 0 to 317 V AC |
| Supported systems | Single-phase and three-phase AC |
| Output contacts | 3 changeover relays |
| Display | Backlit multiline LCD |
| Mounting type | DIN rail |
| Protection standards | G98/1 and G99/1 presets |
| Dimensions (H × W × D) | 90 × 108 × 67 mm |
| Weight | Approx. 0.312 kg |
It provides grid interface protection by monitoring voltage, frequency and other grid parameters before disconnecting renewable energy systems when abnormal conditions occur.
Yes. It features an integrated Modbus RTU communication interface for monitoring and integration into energy management systems.
The relay is suitable for photovoltaic systems, wind turbines, battery storage, CHP systems and other distributed generation installations.
The relay monitors overvoltage, undervoltage, overfrequency, underfrequency, ROCOF, vector shift, interrupted neutral and average voltage conditions.
Yes. The CM-UFD.M33M includes pre-configured settings supporting G98/1 and G99/1 grid connection requirements.
ABB CM-UFD grid feeding monitoring relays are trusted by renewable energy installers, panel builders and electrical engineers to provide dependable grid interface protection for distributed generation systems.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...
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...