Model: PR122/P-LSI
Brand: ABB SACE
Series: SACE Emax (Air Circuit Breakers)
Core Function: High-performance self-supplied electronic trip unit providing overload (L), short-time short-circuit (S), and instantaneous short-circuit (I) protection, along with additional monitoring, measurement, and diagnostic functions for ABB SACE Emax low-voltage air circuit breakers.
HS Code: 8536.90 / 8538.90 (Parts for circuit breakers and electrical control apparatus – confirm local classification)
Product Parameters
| Parameter | Specification |
|---|---|
| Product Type | Electronic Trip Unit / Protection Release |
| Model | PR122/P-LSI |
| Protection Functions | L (Long-time overload), S (Short-time delayed short-circuit), I (Instantaneous short-circuit) |
| Additional Protections | OT (Overtemperature), U (Phase unbalance), MCR (Making Current Release), Thermal memory, Zone selectivity |
| Compatible Circuit Breakers | ABB SACE Emax series (E1, E2, E3, E4, E6) |
| Rated Current Range | Depends on Rating Plug (typically from hundreds of amps up to 6300 A) |
| Power Supply | Self-supplied from current sensors; optional auxiliary 24 V DC |
| Display | Graphic LCD with keypad interface |
| Operating Temperature | –25 °C to +70 °C |
| Storage Temperature | –40 °C to +70 °C / +90 °C |
| Relative Humidity | 0% to 98% (with condensation) |
| Degree of Protection | IP30 (when installed in circuit breaker) |
| Frequency | 50/60 Hz ±10% |
| Communication Options | Optional modules (PR120/D-M, PR120/D-BT, etc.) for Modbus, local bus, Bluetooth |
| Measurement Functions | Current measurement (phases + neutral), data logger, event recording |
Advantages and Features
- Self-powered operation from current sensors – no external power required for basic protection functions
- Clear graphic display and intuitive keypad for easy setting, monitoring, and diagnostics
- High measurement accuracy and continuous monitoring of current sensors and trip coil
- Thermal memory for improved cable protection
- Zone selectivity for better coordination in complex power distribution systems
- Event and trip data logging for fault analysis and maintenance support
- Expandable with optional modules for voltage protection, communication, signaling, and residual current protection
- Robust design suitable for industrial and commercial low-voltage power distribution applications
Application Cases in Application Fields
- Main and sub-distribution boards in industrial plants
- Data centers and critical power systems requiring selective coordination
- Commercial buildings and high-rise facilities
- Power generation auxiliary systems and substations
- Marine and offshore low-voltage distribution
- Retrofit and upgrade of existing ABB SACE Emax air circuit breakers
- Applications requiring precise overload and short-circuit protection with diagnostic capabilities
Comparisons with Competing Products
| Aspect | ABB PR122/P-LSI | Basic Electronic Trip Units | Higher-End Units (e.g. PR123/P) |
|---|---|---|---|
| Protection Level | LSI + additional functions | Usually LI or basic LSI | Full LSIG + advanced voltage/frequency protections |
| Display & Usability | Graphic display + keypad | LED or basic LCD | Advanced graphic + more functions |
| Expandability | Optional modules available | Limited | Extensive module support |
| Data Logging | Yes (events & trips) | Limited or none | Advanced data logger & harmonics |
| Best For | Standard to medium-complexity distribution | Simple protection needs | Complex systems requiring advanced protection & measurement |
| Cost Positioning | Mid-to-high performance | Lower | Premium |
Selection Suggestions and Precautions
Selection Suggestions:
- Confirm the exact Emax circuit breaker frame size (E1–E6) and Rating Plug current rating before ordering.
- Choose PR122/P-LSI when LSI protection plus basic additional functions (unbalance, overtemperature, thermal memory) are sufficient.
- For residual current (earth leakage) protection, consider PR122/P-LSIRc or PR122/P-LSIG versions.
- For advanced voltage, frequency, or harmonic analysis functions, evaluate the PR123/P series instead.
- Verify compatibility with any existing optional modules (PR120 series).
Precautions:
- The trip unit must be correctly matched with the Rating Plug installed on the circuit breaker.
- Proper installation and connection of current sensors and trip coil are critical for reliable operation.
- Settings should be configured according to the specific application and coordination study.
- Use only original ABB accessories and modules to maintain performance and warranty.
- After installation or replacement, perform functional tests using the appropriate test unit (e.g., PR010/T or Ekip T&P).
- Always follow ABB installation, commissioning, and maintenance guidelines.
Recent Popular Same-Brand / Related Models
- PR122/P-LSIG (with earth fault protection)
- PR122/P-LSIRc (with residual current protection)
- PR123/P-LSI / PR123/P-LSIG (higher-performance versions)
- PR121/P series (previous generation)
- Optional modules: PR120/V (measuring), PR120/K (signaling), PR120/D-M (communication), PR120/D-BT (Bluetooth)
- Compatible Emax air circuit breakers: E1, E2, E3, E4, E6 series
