Phoenix ST 2.5 Series Industrial Terminal Blocks Product Selection Guide
In industrial low-medium power control, multi-channel signal collection, and circuit protection scenarios, Phoenix ST 2.5 series terminal blocks are designed for 2.5mm² wires, featuring rich functional configurations, compact structures, and strong compatibility with small-diameter wire systems. This guide sorts out the product codes, models, and detailed descriptions of the series to help you quickly select suitable terminal blocks for 2.5mm² circuit connection requirements.
1. Core Model List (With Product Descriptions)
| Product Code | Product Model | Product Description |
|---|---|---|
| Basic & Color-coded Models | ||
| 3031212 | ST 2,5 | ST 2.5 series basic terminal block, compatible with 2.5mm² wires, cost-effective for general low-medium power control circuit connection (e.g., sensor signal, small solenoid valve power supply) |
| 3031225 | ST 2,5 BU | ST 2.5 series terminal block, blue (BU) appearance, for identifying control/signal circuits in 2.5mm² mixed wiring systems |
| 3037122 | ST 2,5 BK | ST 2.5 series terminal block, black (BK) appearance, suitable for dark environment wiring or equipment with aesthetic matching requirements |
| 3037106 | ST 2,5 GN | ST 2.5 series terminal block, green (GN) appearance, dedicated to grounding circuit identification in 2.5mm² systems |
| 3037096 | ST 2,5 RD | ST 2.5 series terminal block, red (RD) appearance, for marking power supply or high-priority signal circuits in 2.5mm² systems |
| 3037083 | ST 2,5 YE | ST 2.5 series terminal block, yellow (YE) appearance, used for safety warning or emergency circuit identification in 2.5mm² systems |
| 3037070 | ST 2.5 OG | ST 2.5 series terminal block, orange (OG) appearance, for alarm signal circuit identification in 2.5mm² systems |
| Double-circuit (TWIN) Models | ||
| 3031241 | ST 2,5-TWIN | ST 2.5 series double-circuit terminal block, integrates two 2.5mm² circuits in one unit, saves 50% of control cabinet installation space, suitable for dual-circuit parallel wiring |
| 3037342 | ST 2,5-TWIN BK | ST 2.5 series double-circuit terminal block, black appearance, for dual-circuit identification in dark environment wiring |
| 3031254 | ST 2,5-TWIN BU | ST 2.5 series double-circuit terminal block, blue appearance, for dual-circuit control/signal group identification |
| 3031267 | ST 2,5-TWIN-PE | ST 2.5 series double-circuit terminal block with PE protective grounding function, enhances electrical safety of dual 2.5mm² circuits (e.g., dual-sensor signal collection) |
| 3036356 | ST 2,5-TWIN-MT | ST 2.5 series double-circuit terminal block with MT marking function, easy to label circuit information for later maintenance of dual-circuit systems |
| 3036521 | ST 2,5-TWIN-DIO/R-L | ST 2.5 series double-circuit terminal block with DIO/R-L diode protection function, prevents reverse current damage to inductive loads in 2.5mm² dual-circuit systems |
| 3038448 | ST 2,5-TWIN-TG | ST 2.5 series double-circuit terminal block with TG test point function, supports on-site circuit testing without wire disconnection, suitable for key dual-circuit maintenance |
| 3042117 | ST 2,5-TWIN/ 1P | ST 2.5 series double-circuit terminal block with 1P single-circuit derived function, realizes one-input one-output branch wiring for 2.5mm² dual-circuit systems |
| 3042104 | ST 2,5-TWIN/ 1P BU | ST 2.5 series double-circuit terminal block with 1P derived function + blue appearance, for derived branch signal circuit identification |
| 3042120 | ST 2,5-TWIN/ 1P-PE | ST 2.5 series double-circuit terminal block with 1P derived function + PE grounding, ensures safety of derived branch circuits in 2.5mm² systems |
| Four-circuit (QUATTRO) Models | ||
| 3031306 | ST 2,5-QUATTRO | ST 2.5 series four-circuit terminal block, compact design, suitable for high-density 2.5mm² multi-channel signal circuit wiring (e.g., 4-channel sensor signal collection) |
| 3037452 | ST 2,5-QUATTRO BK | ST 2.5 series four-circuit terminal block, black appearance, for multi-channel circuit identification in dark environment wiring |
| 3031319 | ST 2,5-QUATTRO BU | ST 2.5 series four-circuit terminal block, blue appearance, for multi-channel control/signal group identification |
| 3037410 | ST 2,5-QUATTRO RD | ST 2.5 series four-circuit terminal block, red appearance, for multi-channel power supply circuit identification |
| 3031322 | ST 2,5-QUATTRO-PE | ST 2.5 series four-circuit terminal block with PE grounding function, ensures electrical safety of 2.5mm² multi-channel signal circuit systems |
| 3036576 | ST 2,5-QUATTRO-MT | ST 2.5 series four-circuit terminal block with MT marking function, facilitates circuit information management of multi-channel systems |
| 3036233 | ST 2,5-QUATTRO-DIO/L-R | ST 2.5 series four-circuit terminal block with DIO/L-R diode protection function, prevents reverse current damage to left-right direction inductive loads in multi-channel circuits |
| 3036534 | ST 2,5-QUATTRO-DIO/R-L | ST 2.5 series four-circuit terminal block with DIO/R-L diode protection function, protects right-left direction inductive loads in 2.5mm² multi-channel systems |
| 3038451 | ST 2,5-QUATTRO-TG | ST 2.5 series four-circuit terminal block with TG test point function, supports on-site testing of each channel in multi-channel systems without disconnection |
| 3040038 | ST 2,5-QUATTRO/2P | ST 2.5 series four-circuit terminal block with 2P dual-circuit derived function, suitable for 2.5mm² multi-channel circuit shunting (one-input two-output) |
| 3040041 | ST 2,5-QUATTRO/2P-PE | ST 2.5 series four-circuit terminal block with 2P derived function + PE grounding, ensures safety of shunt circuits in multi-channel systems |
| 3031309 | ST 2,5-QUATTRO/2P-D | ST 2.5 series four-circuit terminal block with 2P derived function + D special structure, for customized shunt wiring of 2.5mm² multi-channel circuits |
| Special Function Models (TG/MT/DIO/PE/3L/3PE/3PV) | ||
| 3038435 | ST 2,5-TG | ST 2.5 series terminal block with TG test point function, for on-site maintenance testing of single 2.5mm² circuits |
| 3036343 | ST 2,5-MT | ST 2.5 series terminal block with MT marking function, for single circuit information labeling in 2.5mm² systems |
| 3037818 | ST 2,5-MT BU | ST 2.5 series terminal block with MT marking function + blue appearance, for labeled signal circuit identification |
| 3036262 | ST 2,5-DIO/L-R | ST 2.5 series terminal block with DIO/L-R diode protection function, prevents reverse current damage to left-right direction inductive loads in single 2.5mm² circuits |
| 3036518 | ST 2,5-DIO/R-L | ST 2.5 series terminal block with DIO/R-L diode protection function, protects right-left direction inductive loads in single 2.5mm² circuits |
| 3031238 | ST 2,5-PE | ST 2.5 series terminal block with PE grounding function, basic safety configuration for single 2.5mm² circuits |
| 3036055 | ST 2,5-PE/3L | ST 2.5 series terminal block with PE grounding + 3L three-phase identification, suitable for 2.5mm² three-phase AC low-power circuit wiring |
| 3036097 | ST 2,5-PE/L/L | ST 2.5 series terminal block with PE grounding + double L phase identification, for 2.5mm² dual-phase AC circuit wiring |
| 3036084 | ST 2,5-PE/L/N | ST 2.5 series terminal block with PE grounding + L phase + N neutral identification, dedicated to 2.5mm² single-phase AC circuit wiring |
| 3036042 | ST 2,5-3L | ST 2.5 series terminal block with three-phase (3L) identification, for 2.5mm² three-phase AC circuit phase distinction |
| 3036071 | ST 2,5-3PE | ST 2.5 series terminal block with three-way PE grounding function, suitable for multi-group 2.5mm² circuit grounding protection |
| 3036068 | ST 2,5-3PV | ST 2.5 series terminal block with three-way PV photovoltaic adaptation, for small-power photovoltaic system 2.5mm² multi-channel wiring |
| 3036260 | ST 2,5-BE | ST 2.5 series terminal block with BE special protection function, for customized 2.5mm² circuit safety protection scenarios |
| Derived Circuit Models (/1P/2P) | ||
| 3040012 | ST 2,5/ 1P | ST 2.5 series terminal block with 1P single-circuit derived function, realizes one-input one-output branch wiring for single 2.5mm² circuits |
| 3040656 | ST 2,5/ 1P BU | ST 2.5 series terminal block with 1P derived function + blue appearance, for derived signal branch circuit identification |
| 3040025 | ST 2,5/ 1P-PE | ST 2.5 series terminal block with 1P derived function + PE grounding, ensures safety of derived branch circuits in single 2.5mm² systems |
| 3042133 | ST 2,5/2P | ST 2.5 series terminal block with 2P dual-circuit derived function, suitable for one-input two-output branch wiring of single 2.5mm² circuits |
2. Quick Interpretation of Model Naming Rules
| Naming Segment | Meaning | Explanation |
|---|---|---|
| ST 2,5 | Series Prefix | Phoenix ST series terminal block, compatible with 2.5mm² wires, for low-medium power industrial circuit connection |
| -TWIN/-QUATTRO | Circuit Configuration | - -TWIN: Double-circuit integration, saves installation space for dual-circuit parallel wiring- -QUATTRO: Four-circuit integration, for high-density multi-channel signal wiring |
| -TG/-MT | Maintenance & Identification | - -TG: Test point function, supports on-site circuit testing without wire disconnection- -MT: Marking function, facilitates circuit information labeling and management |
| -DIO/L-R/-DIO/R-L | Protection Function | Diode reverse current protection, L-R/R-L indicates the direction of current protection, prevents inductive load damage |
| -PE/-3PE/-3PV | Safety & Scenario Adaptation | - -PE: Single-way protective grounding, basic electrical safety configuration- -3PE: Three-way grounding, for multi-group circuit protection- -3PV: Three-way photovoltaic adaptation, for small-power PV system wiring |
| -3L/-PE/3L/-PE/L/N | Phase Identification | - -3L: Three-phase circuit identification- -PE/3L: PE grounding + three-phase identification- -PE/L/N: PE grounding + single-phase L/N distinction |
| /1P/2P | Derived Function | - /1P: Single-circuit derived function, one-input one-output branch wiring- /2P: Dual-circuit derived function, one-input two-output branch wiring |
| BU/BK/GN/RD/YE/OG | Color Suffix | Color coding for circuit identification: BU=blue(signal), BK=black(dark environment), GN=green(ground), RD=red(power), YE=yellow(warning), OG=orange(alarm) |
3. Core Advantages of Phoenix ST 2.5 Series Terminal Blocks
- Diversified Circuit ConfigurationCovers double-circuit (TWIN) and four-circuit (QUATTRO) models, meeting dual-circuit parallel wiring 和 high-density multi-channel signal collection needs, and supports 1P/2P branch shunting for flexible circuit design.
- Integrated Safety & Maintenance FunctionsIntegrates PE grounding, diode reverse current protection, TG test points, and MT marking functions, realizing full-link protection and convenient maintenance of 2.5mm² circuits, improving system reliability.
- Clear Color Coding IdentificationProvides 6 color options (BU/BK/GN/RD/YE/OG), distinguishing signal, power, ground, warning, and alarm circuits at a glance, reducing wiring errors in complex systems.
- Strong Scenario AdaptabilityCovers general control, multi-channel signal, photovoltaic system, and three-phase AC circuit scenarios, suitable for manufacturing, automation, and photovoltaic industries.
4. Product Selection Suggestions
- Select by Circuit Quantity & Density
- For single-circuit 2.5mm² wiring: Choose basic ST 2,5 models (e.g., 3031212, 3031225) or single-function models (e.g., 3038435, 3036343).
- For dual-circuit parallel wiring: Select ST 2,5-TWIN series models (e.g., 3031241, 3031267).
- For four-channel high-density wiring: Adopt ST 2,5-QUATTRO series models (e.g., 3031306, 3031322).
- Select by Functional Requirements
- For electrical safety: Prioritize models with -PE suffix (e.g., 3031238, 3031267, 3031322) or -3PE (3036071).
- For circuit maintenance: Choose models with -TG test point function (e.g., 3038435, 3038448, 3038451) or -MT marking function (e.g., 3036343, 3036356).
- For inductive load protection: Select models with -DIO diode protection (e.g., 3036262, 3036521, 3036233).
- For photovoltaic system wiring: Use the -3PV model (3036068).
- For three-phase AC circuit: Choose models with -3L phase identification (e.g., 3036042, 3036055).
- Select by Circuit Identification Needs
- For signal circuits: Choose blue (BU) models (e.g., 3031225, 3031254).
- For ground circuits: Select green (GN) models (3037106).
- For power circuits: Use red (RD) models (3037096).
- For warning/emergency circuits: Adopt yellow (YE, 3037083) or orange (OG, 3037070) models.
Phoenix ST 2.5 Series Industrial Terminal Blocks Product Selection Guide
Created on：2026-01-15 09:21
