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.
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| Signal / Input Range | 0–317 V AC | |
|---|---|---|
| Monitoring Function | Frequency | |
| 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.
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