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Both models belong to the Schneider PowerLogic/Easergy P3U30 Series Universal Protection Relay. The core difference lies only in the last two characters (AA vs AC). The complete structure analysis is as follows:
| Model Segment | Meaning | P3U30-5AAA2BBAA | P3U30-5AAA2BBAC |
| P3U30 | Product Series | Universal Protection Relay (P3U30) | Universal Protection Relay (P3U30) |
| 5 | Power Supply Type | 48-230V AC/DC | 48-230V AC/DC |
| AAA | Measurement Input | 3CT (1/5A), 1Io (1/5A), 4VT (100V/110V) | 3CT (1/5A), 1Io (1/5A), 4VT (100V/110V) |
| 2 | I/O Configuration | 16DI/8DO (with watchdog) | 16DI/8DO (with watchdog) |
| BB | Communication Module | Basic communication configuration | Basic communication configuration |
| AA/AC | Digital Input Voltage + Communication Interface | AA: DI=220V AC/DC, RS485 serial port only | AC: DI=110-230V AC/DC, Dual RJ45 Ethernet ports + RS485 |
- Key Specification Comparison Table
| Parameter Category | P3U30-5AAA2BBAA | P3U30-5AAA2BBAC | Impact of Difference |
| Standard REL Code | REL52002 | REL52008 | Official material code distinction |
| Digital Input (DI) | 16 channels, 220V AC/DC | 16 channels, 110-230V AC/DC | AC version has wider voltage range for more application scenarios |
| Communication Interface | 1×RS485 Serial Port (Modbus RTU / IEC 60870-5-101/103) | 2×RJ45 Ethernet Ports (IEC 61850 / Modbus TCP) + 1×RS485 Serial Port | AC version supports Ethernet communication for system network integration |
| Communication Protocol | Serial protocols only (no Ethernet) | All serial protocols + Ethernet protocols (IEC 61850 Ed.1/Ed.2, DNP3, Ethernet/IP) | AC version complies with modern industrial Ethernet standards |
| Connection Type | Screw terminals | Screw terminals + Dual RJ45 ports | AC version facilitates network wiring and remote monitoring |
| Other Core Parameters | Identical: 3CT phase current input (1/5A), 1Io residual current input (1/5A), 4VT voltage input (100V/110V), 8DO (with watchdog), 48-230V AC/DC power supply | Identical | Basic protection functions are fully consistent |
- Detailed Description of Differences
3.1 Digital Input Voltage Difference
P3U30-5AAA2BBAA (REL52002): Fixed digital input of 220V AC/DC, suitable for standard industrial control voltage environments.
P3U30-5AAA2BBAC (REL52008): Wide-range digital input of 110-230V AC/DC, compatible with more international standard voltages with higher flexibility.
3.2 Communication Capability Difference (Core Distinction)
P3U30-5AAA2BBAA: Equipped with only RS485 serial communication, suitable for simple point-to-point communication; does not support network integration or remote monitoring.
P3U30-5AAA2BBAC: Equipped with dual RJ45 Ethernet ports + RS485 serial port, supporting:
Redundant Ethernet communication (RSTP/PRP protocol)
IEC 61850 substation communication standard (Ed.1/Ed.2)
Modern industrial protocols such as Modbus TCP, DNP3, Ethernet/IP
Remote configuration, monitoring and firmware upgrade
3.3 Application Scenario Adaptation
| Application Scenario | Recommended Model | Reason |
| Traditional Substation (No network requirement) | P3U30-5AAA2BBAA | Lower cost, meets basic communication needs |
| Smart Substation / Industrial IoT | P3U30-5AAA2BBAC | Supports IEC 61850 for easy system integration |
| International Projects / Multi-voltage Environment | P3U30-5AAA2BBAC | Wide-range DI voltage adapts to different national standards |
| Remote Monitoring & Diagnostics Requirement | P3U30-5AAA2BBAC | Ethernet enables remote access |
| Cost-Sensitive Projects | P3U30-5AAA2BBAA | Approximately 10-15% lower price than AC version |
- Selection Recommendations
- Communication Requirement Judgment
Local communication or simple SCADA connection only: Choose AA version (REL52002)
IEC 61850, remote monitoring or network redundancy required: Must choose AC version (REL52008)
- Digital Input Voltage Adaptation
System unified with 220V control voltage: AA version fully compatible
Mixed 110V/220V control voltage or uncertain future demands: Choose AC version with wide-range input
- Future Expandability
The dual Ethernet port design of AC version reserves space for future system upgrades and supports advanced smart grid applications.
- Supplementary Information
Hardware Compatibility: Both models have identical physical dimensions and mounting methods, enabling direct interchangeable installation.
Protection Functions: Both provide more than 40 protection functions including overcurrent, earth fault, undervoltage, phase sequence reversal, etc., meeting feeder and motor protection requirements.
Certifications: Both comply with international standards such as IEC 60255 and EN 61850 for global market application.
Communication Interface Difference: P3U30-5AAA2BBAA vs P3U30-5AAA2BBAC
P3U30-5AAA2BBAA has only an RS485 serial port without Ethernet; P3U30-5AAA2BBAC retains RS485 and adds dual RJ45 Ethernet ports to support network communication.
- Detailed Communication Interface Comparison
| Item | P3U30-5AAA2BBAA | P3U30-5AAA2BBAC |
| Physical Network Port | No RJ45 Ethernet port | 2-channel RJ45 Ethernet ports |
| Serial Interface | 1-channel RS485 terminal | 1-channel RS485 terminal (retained same as AA version) |
| Communication Hardware | Serial communication hardware only | Dual hardware: Serial + Ethernet |
| Supported Protocols | Serial protocols only: | All serial protocols + Ethernet protocols: |
| Modbus RTU, IEC 60870-5-101/103 | Modbus TCP, IEC 61850, DNP3, etc. | |
| Networking Capability | Only RS485 bus networking | Supports Ethernet star/ring/redundant networking and dual-port cascading |
| Remote / Smart Substation | No Ethernet remote access, no IEC61850 support | Supports remote network access and IEC61850 smart substation standard |
- Key Difference Summary
- AA Version: Pure serial port type
Only RS485 interface, limited to traditional RS485 bus networking; cannot connect to switches, access Ethernet, or support IEC61850.
- AC Version: Hybrid type with serial port + dual Ethernet ports
Retains the original RS485 interface and adds 2 RJ45 ports, which can be directly connected to industrial switches, form ring networks, and support IEC61850 & Modbus TCP network communication.
- Simple Selection Rule
Only RS485 communication for traditional cabinet internal connection → Choose P3U30-5AAA2BBAA
Require Ethernet, remote networking, smart substation or IEC61850 → Must choose P3U30-5AAA2BBAC
Schneider PowerLogic P3U30 Series Universal Protection Relay Model List
- Model Coding Rule (Full Interpretation)
The P3U30 series adopts the format P3U30-XXXXXXXX with 14 characters. The definition of each segment is as follows:
| Model Segment | Position | Meaning | Optional Code & Description |
| P3U30 | 1-5 | Product Series | P3U30 = Universal Protection Relay for feeder and motor protection |
| 5月6日 | 6 | Power Supply Type | 5 = 48-230V AC/DC |
| 6 = 24-48V AC/DC | |||
| AAA/ABA | 7-9 | Measurement Input Configuration | AAA = 3CT(1/5A), 1Io(1/5A), 4VT(100V/110V) |
| ABA = 4L (3CT+1Io) ring-type terminal, 4VT(100V/110V) | |||
| 1月2日 | 10 | I/O Configuration | 1 = 16DI/4DO (without watchdog) |
| 2 = 16DI/8DO (with watchdog) | |||
| BB/BD/BC | 11-12 | Basic Communication Configuration | BB = Basic communication |
| BD = Extended communication | |||
| BC = Advanced communication | |||
| AA/AC/BA/CA | 13-14 | Digital Input Voltage + Communication Interface | AA = DI=220V AC/DC, RS485 only |
| AC = DI=110-230V AC/DC, Dual RJ45 + RS485 | |||
| BA = DI=24-48V AC/DC, RS485 only | |||
| CA = DI=24-230V AC/DC, Dual RJ45 + RS485 |
- Complete Model List (Classified by Communication Interface)
2.1 RS485 Serial Communication Only (Without Ethernet)
| Model | REL Code | Power Supply | Measurement Input | I/O Configuration | DI Voltage | Communication Interface | Application Scenario |
| P3U30-5AAA2BBAA | REL52002 | 48-230V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 220V AC/DC | 1×RS485 | Traditional substation, local communication |
| P3U30-5AAA2BBBA | REL52003 | 48-230V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 24-48V AC/DC | 1×RS485 | Low-voltage control system, PLC interlocking |
| P3U30-6AAA2BBAA | REL52004 | 24-48V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 220V AC/DC | 1×RS485 | DC system, battery-powered |
| P3U30-6AAA2BBBA | REL52005 | 24-48V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 24-48V AC/DC | 1×RS485 | Small equipment, low-power application |
| P3U30-5ABA1BBAA | REL52006 | 48-230V AC/DC | 4L ring type + 4VT | 16DI/4DO (without watchdog) | 220V AC/DC | 1×RS485 | Feeder protection, simplified configuration |
| P3U30-6ABA1BBAA | REL52007 | 24-48V AC/DC | 4L ring type + 4VT | 16DI/4DO (without watchdog) | 220V AC/DC | 1×RS485 | Distributed system, remote terminal unit |
2.2 Dual RJ45 Ethernet + RS485 Communication (Smart Type)
| Model | REL Code | Power Supply | Measurement Input | I/O Configuration | DI Voltage | Communication Interface | Application Scenario |
| P3U30-5AAA2BBAC | REL52008 | 48-230V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 110-230V AC/DC | 2×RJ45+1×RS485 | Smart substation, IEC 61850 |
| P3U30-5AAA2BBCC | REL52009 | 48-230V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 24-230V AC/DC | 2×RJ45+1×RS485 | International projects, multi-voltage compatibility |
| P3U30-6AAA2BBAC | REL52010 | 24-48V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 110-230V AC/DC | 2×RJ45+1×RS485 | DC smart system, remote monitoring |
| P3U30-6AAA2BBCC | REL52011 | 24-48V AC/DC | 3CT+1Io+4VT | 16DI/8DO (with watchdog) | 24-230V AC/DC | 2×RJ45+1×RS485 | IoT integration, multi-protocol support |
| P3U30-5ABA1BDAC | REL52012 | 48-230V AC/DC | 4L ring type + 4VT | 16DI/4DO (without watchdog) | 110-230V AC/DC | 2×RJ45+1×RS485 | Feeder automation, network redundancy |
| P3U30-6ABA1BDAC | REL52013 | 24-48V AC/DC | 4L ring type + 4VT | 16DI/4DO (without watchdog) | 110-230V AC/DC | 2×RJ45+1×RS485 | Distributed feeder protection, IEC 61850 |
2.3 Special Configuration Models (Wide Temperature / Extended Functions)
| Model | REL Code | Special Features | Communication Interface | Remarks |
| P3U30-5AAA2BBAA-W | REL52045 | Wide temperature (-25°C~+70°C) | 1×RS485 | Outdoor application, harsh environment |
| P3U30-5AAA2BBAC-W | REL52046 | Wide temperature (-25°C~+70°C) | 2×RJ45+1×RS485 | Smart outdoor equipment, remote diagnosis |
| P3U30-5ABA2BDAA | REL52047 | 4L ring terminal, extended I/O | 1×RS485 | High-current measurement, industrial monitoring |
| P3U30-5ABA2BDAC | REL52048 | 4L ring terminal, extended I/O | 2×RJ45+1×RS485 | Smart grid, feeder automation |
- Key Parameter Overview Comparison
| Parameter Category | RS485 Only Models | Ethernet + RS485 Models | Common Features |
| Communication Protocols | Modbus RTU, IEC 60870-5-101/103 | Serial protocols + IEC 61850, Modbus TCP, DNP3, Ethernet/IP | All support basic serial protocols |
| Networking Capability | RS485 bus only, point-to-point / bus topology | Ethernet star/ring/redundancy (RSTP/PRP), dual-port cascading | Support standard industrial networking modes |
| Digital Input | Two fixed voltages: 220V / 24-48V | Wide-range voltage: 110-230V / 24-230V | 16 channels with optical isolation |
| Digital Output | 4DO / 8DO (watchdog optional) | 4DO / 8DO (watchdog optional) | Relay output, contact rating 5A/250V AC |
| Measurement Accuracy | Class 0.2 (Current/Voltage), Class 0.5 (Power) | Class 0.2 (Current/Voltage), Class 0.5 (Power) | Compliant with IEC 60255 |
| Protection Functions | 40+ protections (overcurrent, earth fault, undervoltage, etc.) | 40+ protections (overcurrent, earth fault, undervoltage, etc.) | Suitable for feeder and motor protection |
| Power Supply Range | 24-48V or 48-230V AC/DC | 24-48V or 48-230V AC/DC | Wide voltage design for global power grid adaptation |
- Quick Selection Chart (By Core Requirement)
| Core Requirement | Recommended Model | Key Advantages |
| Traditional substation without network demand | P3U30-5AAA2BBAA | Low cost, meets basic communication |
| Smart substation with IEC 61850 | P3U30-5AAA2BBAC | Dual Ethernet ports, supports IEC 61850 Ed.1/Ed.2 |
| International project with multi-voltage environment | P3U30-5AAA2BBCC | 24-230V wide-range DI, global compatibility |
| DC system with battery power supply | P3U30-6AAA2BBAA | 24-48V power supply, low power consumption |
| Outdoor application & harsh environment | P3U30-5AAA2BBAC-W | Wide temperature design, strong anti-interference |
| High-current measurement with ring terminals | P3U30-5ABA2BDAC | 4L ring terminals compatible with high-current CT |
- Supplementary Information
- Hardware Compatibility: All P3U30 models share identical physical dimensions (96×96×75mm) and mounting methods (DIN rail / panel mounting) for direct interchangeable installation.
- Protection Functions: All models offer 40+ protection functions including overcurrent (I>>), earth fault (Ig), undervoltage (U<), phase sequence reversal, overload, etc., complying with IEC 60255 standard.
- Certifications: Compliant with CE, UL, CSA, IEC 61850 and other international certifications for global market use.
- Firmware Upgrade: Ethernet models support remote firmware upgrade; RS485 models require local upgrade.
- Accessory List:
Front Connector: Standard 9-pin spring terminal
Communication Cable: RS485 shielded twisted pair (optional)
Ethernet Cable: CAT5e/CAT6 industrial Ethernet cable (Ethernet models only)
