Phoenix STTB/STTBS Series Industrial Terminal Blocks Product Selection Guide
In industrial low-power control, photovoltaic system wiring, and signal circuit connection scenarios, Phoenix STTB/STTBS series terminal blocks are favored for their compact size, dedicated functional design, and strong compatibility with small-diameter wires. This guide sorts out the product codes, models, and detailed descriptions of the series to help you quickly select suitable terminal blocks for 1.5mm²/2.5mm²/4mm² low-power circuit connection requirements.
1. Core Model List (With Product Descriptions)
| Product Code | Product Model | Product Description |
|---|---|---|
| STTBS Series Terminal Blocks (Enhanced Small-power Models) | ||
| 3035483 | STTBS 4-TG | STTBS series 4mm² terminal block with TG test point function, enabling on-site circuit testing without wire disconnection, suitable for key 4mm² low-power control circuits |
| 3035470 | STTBS 4-MT | STTBS series 4mm² terminal block with MT marking function, easy to label circuit information for later maintenance of 4mm² systems |
| 3038477 | STTBS 2,5-PV | STTBS series 2.5mm² terminal block with PV photovoltaic system adaptation, dedicated to small-power photovoltaic circuit wiring (e.g., solar panel signal collection) |
| 3038480 | STTBS 2,5-PE | STTBS series 2.5mm² terminal block with PE protective grounding function, enhancing electrical safety of 2.5mm² low-power signal circuits |
| 3038464 | STTBS 2,5 | STTBS series basic 2.5mm² terminal block, optimized structural design, suitable for high-stability 2.5mm² low-power control circuit connection |
| STTB Series Terminal Blocks (Mainstream Small-power Models) | ||
| 4mm² Wire Compatibility | ||
| 3031429 | STTB 4 | STTB series basic 4mm² terminal block, cost-effective for general 4mm² low-power circuit connection (e.g., motor auxiliary control circuits) |
| 3031432 | STTB 4 BU | STTB series 4mm² terminal block, blue (BU) appearance, facilitating identification of control signal circuits in 4mm² wiring systems |
| 3036039 | STTB 4-PE | STTB series 4mm² terminal block with PE grounding function, ideal for safety-critical 4mm² low-power circuit scenarios |
| 2.5mm² Wire Compatibility (Rich Functional Configuration) | ||
| 3031270 | STTB 2,5 | STTB series basic 2.5mm² terminal block, standard structure for general 2.5mm² low-power control and signal circuit connection |
| 3031283 | STTB 2,5 BU | STTB series 2.5mm² terminal block, blue appearance, used for marking control/signal circuits in 2.5mm² mixed wiring systems |
| 3038516 | STTB 2,5-TWIN | STTB series 2.5mm² double-circuit terminal block, integrating two 2.5mm² circuits in one unit, saving 50% of control cabinet installation space |
| 3038532 | STTB 2,5-TWIN-PE | STTB series 2.5mm² double-circuit terminal block with PE grounding function, enhancing safety of dual 2.5mm² low-power circuits (e.g., dual-sensor signal collection) |
| 3036026 | STTB 2,5-PE | STTB series 2.5mm² terminal block with PE grounding function, basic safety configuration for 2.5mm² low-power circuits |
| 3036327 | STTB 2,5-PE/N | STTB series 2.5mm² terminal block with PE grounding + N neutral wire identification, suitable for 2.5mm² single-phase AC low-power circuit wiring |
| 3036330 | STTB 2,5-L/N | STTB series 2.5mm² terminal block with L phase + N neutral identification, dedicated to phase-neutral distinction in 2.5mm² AC control circuits |
| 3031539 | STTB 2,5-PV | STTB series 2.5mm² terminal block with PV photovoltaic adaptation, cost-effective choice for small-power photovoltaic system wiring |
| 3031555 | STTB 2,5-DIO/O-U | STTB series 2.5mm² terminal block with DIO/O-U diode protection function, preventing reverse current damage to inductive loads (e.g., small solenoid valves) in 2.5mm² circuits |
| 3031563 | STTB 2,5-DIO/U-O | STTB series 2.5mm² terminal block with DIO/U-O diode protection function, reverse current protection for 2.5mm² signal circuits in opposite direction |
| 3031584 | STTB 2,5-2DIO/O-UL/UR-UL | STTB series 2.5mm² terminal block with dual DIO diode protection function, supporting multi-directional reverse current protection for complex 2.5mm² signal systems |
| 3040054 | STTB 2,5/2P | STTB series 2.5mm² terminal block with 2P dual-circuit derived function, suitable for 2.5mm² circuit shunting (e.g., one-input two-output signal distribution) |
| 1.5mm² Wire Compatibility (Ultra-compact Low-power Models) | ||
| 3031157 | STTB 1,5 | STTB series basic 1.5mm² terminal block, ultra-compact design, ideal for high-density 1.5mm² micro-signal circuit wiring (e.g., precision instrument internal connections) |
| 3031160 | STTB 1,5 BU | STTB series 1.5mm² terminal block, blue appearance, facilitating identification of key micro-signal circuits in 1.5mm² dense wiring systems |
2. Quick Interpretation of Model Naming Rules
| Naming Segment | Meaning | Explanation |
|---|---|---|
| STTB/STTBS | Series prefix | - STTB: Mainstream small-power terminal block series, cost-effective for general low-power circuits- STTBS: Enhanced small-power terminal block series, optimized structure for high-stability scenarios |
| 1.5/2.5/4 | Wire diameter compatibility | Compatible with 1.5mm²/2.5mm²/4mm² wires, matching different low-power circuit current-carrying requirements |
| -TG | Maintenance function | Test point function, supports on-site circuit testing without disconnection, improving maintenance efficiency |
| -MT | Identification function | Marking function, enables circuit information labeling for complex system management |
| -PV | Scenario adaptation | Photovoltaic system adaptation, dedicated to small-power solar energy circuit wiring |
| -PE | Safety function | Protective grounding function, mandatory for electrical safety in industrial low-power circuits |
| -PE/N/-L/N | Phase identification | PE grounding + N neutral / L phase + N neutral identification, ensuring correct AC low-power circuit wiring |
| -DIO/O-U/-DIO/U-O/-2DIO | Protection function | Diode reverse current protection, single/dual diode options for different circuit protection needs |
| -TWIN | Circuit configuration | Double-circuit integration, space-saving for dual low-power circuit parallel wiring |
| /2P | Derived function | 2P dual-circuit shunting, realizing one-input two-output signal distribution |
| BU | Color suffix | Blue appearance, for control/signal circuit identification in mixed wiring systems |
3. Core Advantages of Phoenix STTB/STTBS Series Terminal Blocks
- Multi-specification Wire CompatibilityCovers 1.5mm²/2.5mm²/4mm² small-diameter wires, matching low-power control, signal transmission, and photovoltaic system wiring needs, with strong versatility.
- Diversified Functional ConfigurationIntegrates test point (TG), marking (MT), photovoltaic adaptation (PV), grounding (PE), diode protection (DIO), and phase identification functions, meeting the needs of simple wiring to complex signal system applications.
- Compact & Space-saving DesignUltra-compact structure, especially TWIN double-circuit models, saves 50% of installation space in control cabinets, ideal for high-density small-power circuit wiring scenarios.
- Enhanced Stability & SafetySTTBS enhanced series has optimized conductive structure for high-stability signal transmission; PE grounding and DIO diode protection models effectively improve circuit safety and reliability.
- Cost-effective Scenario MatchingProvides basic STTB series and enhanced STTBS series options, balancing performance and cost for different low-power circuit application scenarios.
4. Product Selection Suggestions
- Select by Wire Diameter & Current-carrying Requirements
- For 1.5mm² micro-signal circuits (precision instruments): Choose STTB 1.5/1.5 BU models.
- For 2.5mm² general low-power control/signal circuits: Select STTB 2.5/2.5 BU models; choose PV models for photovoltaic systems, DIO models for inductive load protection.
- For 4mm² low-power auxiliary control circuits: Adopt STTB 4/4 BU models; select STTBS 4-TG/4-MT models for maintenance needs.
- Select by Functional Requirements
- For on-site maintenance convenience: Prioritize STTBS 4-TG models with test point function.
- For circuit safety protection: Choose models with -PE suffix (e.g., STTBS 2.5-PE, STTB 2.5-TWIN-PE) or -DIO suffix (e.g., STTB 2.5-DIO/O-U).
- For space-saving dense wiring: Use STTB 2.5-TWIN double-circuit models.
- For photovoltaic system wiring: Select PV adaptation models (STTBS 2.5-PV, STTB 2.5-PV).
- Select by Stability Requirements
- For general low-power circuits: Choose cost-effective STTB series models.
- For high-stability key signal circuits: Adopt enhanced STTBS series models.
Phoenix STTB/STTBS Series Industrial Terminal Blocks Product Selection Guide
Created on：2026-01-14 11:00
