Carlo Gavazzi PPB01CM48N is a three-phase voltage monitoring relay for phase loss, overvoltage and undervoltage monitoring on 380–480 V AC industrial power systems without phase-sequence detection.
£161.55
The Carlo Gavazzi PPB01CM48N is a reliable three-phase voltage monitoring relay designed to monitor industrial electrical supplies for phase loss, overvoltage and undervoltage conditions. As part of the proven Carlo Gavazzi PPB01 monitoring relay series, it provides dependable supervision of three-phase power systems where accurate voltage monitoring is essential.
The PPB01CM48N is designed for 380–480 V AC three-phase supplies and operates at 50–60 Hz. The N version is designed to monitor phase loss and voltage levels without phase-sequence detection. Separate overvoltage and undervoltage setpoints can be adjusted, while an adjustable alarm delay helps prevent unwanted relay operation caused by short-duration voltage disturbances.
The relay uses a compact 36 mm wide plug-in housing for an 11-pin socket and provides an SPDT electromechanical relay output for connection to machine control, alarm and protection circuits. Its self-supplied design means that the relay is powered directly from the measured three-phase supply.
Three-phase voltage monitoring relays continuously supervise electrical supplies and provide a control response when abnormal voltage or phase conditions are detected. This helps automation systems identify supply faults before they can adversely affect connected machinery, motors and electrical equipment.
The Carlo Gavazzi PPB01CM48N measures the three-phase supply and monitors its voltage against independently adjustable upper and lower limits. Its phase-loss monitoring and configurable alarm delay make it suitable for industrial control panels, machinery and electrical protection systems where phase-sequence detection is not required.
| Manufacturer | Carlo Gavazzi |
|---|---|
| Series | PPB01 |
| Model | PPB01CM48N |
| Product type | Three-phase voltage monitoring relay |
| Monitoring functions | Phase loss, overvoltage and undervoltage |
| Phase sequence monitoring | No |
| Nominal voltage range | 380–480 V AC |
| Operating voltage range | 323–552 V AC |
| Input frequency | 50–60 Hz |
| Input configuration | 3-phase or 3-phase + neutral |
| Undervoltage adjustment | −2% to −22% |
| Overvoltage adjustment | +2% to +22% |
| Alarm delay | 0.1–30 s |
| Output | 1 × SPDT electromechanical relay |
| Power supply | Supplied by measured phases |
| Power consumption | <2.5 VA |
| Mounting | Plug-in |
| Socket | 11-pin Undecal |
| Housing width | 36 mm |
| Dimensions (H × W × D) | 80 × 36 × 94 mm |
| Protection rating | IP20 |
| Housing material | PA66 or Noryl |
| Housing colour | RAL7035 light grey |
| Weight | approx. 150 g |
The PPB01CM48N monitors three-phase electrical supplies for phase loss, overvoltage and undervoltage conditions.
The relay is designed for nominal three-phase voltages from 380 V to 480 V AC, with an operating voltage range of approximately 323 V to 552 V AC.
No. The PPB01CM48N is an N-version monitoring relay without phase-sequence detection; it monitors phase loss, overvoltage and undervoltage.
Yes. The undervoltage and overvoltage thresholds can be adjusted independently from approximately 2% to 22% of the nominal voltage, with an adjustable alarm delay from 0.1 s to 30 s.
The PPB01CM48N uses a 36 mm wide plug-in housing designed for an 11-pin Undecal socket.
Carlo Gavazzi PPB01 voltage monitoring relays provide dependable supervision of three-phase power supplies, helping automation engineers detect phase and voltage faults across industrial machinery, control panels and electrical installations.
● 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...