Phoenix PLT Series: T3-Type Industrial Surge Protection & Interface Modules - Selection Guide
Product Overview
The Phoenix PLT Series comprises T3-type (IEC Type 3) surge protection modules and industrial interface modules, designed for secondary surge protection in power lines and signal circuits. The PLT-SEC-T3 sub-series focuses on surge suppression for AC/DC power systems (24V/60V/230V), with variants for single-phase/three-phase (3S) configurations, while the PLT-T3 sub-series offers basic industrial interface functionality. Featuring functional options (status indication/FM, terminal types/P/FM, protection grades/UT/PT) and compliance with IEC 61643-12, these modules safeguard sensitive equipment against transient overvoltages from switching operations or indirect lightning strikes. Ideal for industrial control cabinets, automation systems, and power distribution networks, they ensure reliable operation in harsh industrial environments.
Model Quick Reference Table
1. PLT-T3 Basic Interface Modules
| Model No. |
Product Name |
Voltage Rating |
Key Features |
Application Scenarios |
| 2906451 |
PLT-T3-IT-230-P |
230V AC |
Basic interface, screw terminal (P) |
230V AC industrial signal interface |
| 2906450 |
PLT-T3-IT-230-FM |
230V AC |
Interface with status indicator (FM) |
230V AC signal transmission with status monitoring |
2. PLT-SEC-T3 Surge Protection Modules (Single-Phase)
| Model No. |
Product Name |
Voltage Rating |
Key Features |
Application Scenarios |
| 2905557 |
PLT-SEC-T3-BE |
230V AC |
Standard BE configuration, basic protection |
230V AC single-phase power surge protection |
| 2907924 |
PLT-SEC-T3-BE-FM-UT |
230V AC |
FM (status indicator), UT (overvoltage+overcurrent) |
230V AC single-phase power with dual protection |
| 2907929 |
PLT-SEC-T3-BE-FM-PT |
230V AC |
FM (status indicator), PT (overvoltage) |
230V AC single-phase power surge monitoring |
| 2905233 |
PLT-SEC-T3-60-P |
60V DC |
Screw terminal (P), basic protection |
60V DC power surge protection (e.g., industrial drives) |
| 2907917 |
PLT-SEC-T3-60-FM-UT |
60V DC |
FM (status indicator), UT protection |
60V DC power with dual protection and status feedback |
| 2907926 |
PLT-SEC-T3-60-FM-PT |
60V DC |
FM (status indicator), PT protection |
60V DC power surge monitoring |
| 2905225 |
PLT-SEC-T3-60-FM |
60V DC |
FM (status indicator), basic protection |
60V DC power surge protection with status indication |
| 2905232 |
PLT-SEC-T3-24-P |
24V DC |
Screw terminal (P), basic protection |
24V DC control circuit surge protection (PLCs, sensors) |
| 2907920 |
PLT-SEC-T3-24-P-UT/PT |
24V DC |
P terminal, switchable UT/PT protection |
24V DC flexible surge protection (customizable) |
| 2907916 |
PLT-SEC-T3-24-FM-UT |
24V DC |
FM (status indicator), UT protection |
24V DC control circuit with dual protection |
| 2907925 |
PLT-SEC-T3-24-FM-PT |
24V DC |
FM (status indicator), PT protection |
24V DC control circuit surge monitoring |
| 2905223 |
PLT-SEC-T3-24-FM |
24V DC |
FM (status indicator), basic protection |
24V DC control circuit surge protection with status feedback |
3. PLT-SEC-T3 Surge Protection Modules (Three-Phase)
| Model No. |
Product Name |
Voltage Rating |
Key Features |
Application Scenarios |
| 2905592 |
PLT-SEC-T3-3S-BE |
230V AC |
Three-phase (3S), standard BE configuration |
230V AC three-phase power surge protection |
| 2905236 |
PLT-SEC-T3-3S-230-P |
230V AC |
Three-phase (3S), screw terminal (P) |
230V AC three-phase industrial power surge protection |
| 2905230 |
PLT-SEC-T3-3S-230-FM |
230V AC |
Three-phase (3S), FM (status indicator) |
230V AC three-phase power surge protection with status monitoring |
Core Technical Specifications (Universal)
| Parameter |
Value |
Notes |
| Protection Class |
IEC Type 3 (Secondary Surge Protection) |
Complies with IEC 61643-12 |
| Voltage Ratings |
24V DC, 60V DC, 230V AC |
Model-dependent |
| Nominal Discharge Current (In) |
2.5kA (8/20μs) |
Surge absorption capacity |
| Maximum Discharge Current (Imax) |
5kA (8/20μs) |
Peak surge handling capability |
| Response Time |
≤25ns |
Fast suppression of transient overvoltages |
| Operating Temperature |
-25℃~70℃ |
Adapts to harsh industrial environments |
| Mounting Type |
35mm DIN rail (NS 35/7.5) |
Compact design for space-saving |
| Terminal Types |
Screw (P): 0.14~2.5mm²; FM: Plug-in + Status Indicator |
Flexible wiring options |
| Protection Functions |
UT: Overvoltage + Overcurrent; PT: Overvoltage |
Model-dependent protection grades |
| Protection Class |
IP20 (cabinet mounting) |
Dust-proof for industrial control cabinets |
| Certifications |
CE, UL, CSA, IEC 61643-12 |
Global industrial compliance |
| Status Indication |
FM models: Green=Normal, Red=Fault |
Visual fault detection |
Application Scenarios & Recommended Models
1. 24V DC Control Circuit Protection
- Requirement: 24V DC PLC/sensor surge protection with status monitoring
- Recommended Model: 2907916 (PLT-SEC-T3-24-FM-UT)
- Key Reason: UT dual protection (overvoltage+overcurrent) + FM status indicator; ideal for sensitive control circuits
2. 230V AC Single-Phase Power Protection
- Requirement: 230V AC industrial power secondary surge protection
- Recommended Model: 2907924 (PLT-SEC-T3-BE-FM-UT)
- Key Reason: IEC Type 3 protection + FM status feedback + UT dual protection; covers most single-phase AC applications
3. 230V AC Three-Phase Industrial Power Protection
- Requirement: 230V AC three-phase production line power surge protection
- Recommended Model: 2905230 (PLT-SEC-T3-3S-230-FM)
- Key Reason: Three-phase (3S) configuration + FM status indicator; suitable for industrial power distribution networks
4. 60V DC Drive System Protection
- Requirement: 60V DC industrial drive surge protection with fault alarm
- Recommended Model: 2907926 (PLT-SEC-T3-60-FM-PT)
- Key Reason: PT overvoltage protection + FM remote alarm; tailored for DC drive systems
5. Flexible Protection Configuration
- Requirement: 24V DC customizable surge protection (switchable UT/PT)
- Recommended Model: 2907920 (PLT-SEC-T3-24-P-UT/PT)
- Key Reason: Switchable protection types; adapts to diverse 24V DC application needs
Core Advantages
- IEC Type 3 Compliance: Secondary surge protection for downstream equipment, complementing Type 1/2 protectors
- Dual Protection Options: UT (overvoltage+overcurrent) and PT (overvoltage) fit different risk levels
- Status Monitoring: FM models feature visual indicators and remote alarm contacts for quick fault detection
- Wide Voltage Coverage: 24V DC~230V AC, single-phase/three-phase options cover industrial power needs
- Compact Design: DIN rail mounting (narrow width) saves control cabinet space
- Industrial-Grade Durability: -25℃~70℃ operating temperature, 5kA Imax surge capacity
- Easy Installation: Screw/plug-in terminals and standard DIN rail mounting simplify deployment
Installation & Usage Notes
- Protection Hierarchy: Install as secondary protection (IEC Type 3) downstream of Type 1/2 surge protectors (e.g., at control cabinet inputs)
- Voltage Matching: Select models with voltage ratings matching the protected circuit (e.g., 24DC for 24V DC control circuits)
- Wiring Specifications: Use 0.14~2.5mm² conductors; keep connection lines ≤0.5m to maintain protection performance
- Mounting Position: Install as close to the protected equipment as possible for optimal surge suppression
- Status Alarm Wiring: For FM models, connect remote alarm contacts to PLC/DCS for centralized monitoring
- Phase Configuration: For three-phase systems, use 3S-suffixed models; ensure correct phase-to-phase/phase-to-ground wiring
- Maintenance Checks: Regularly inspect FM status indicators (green=normal, red=fault); replace faulty modules promptly
