Phoenix ST Series Terminal Blocks Selection Guide: Precise Part Number & Model Matching

Opening: Reliable Industrial Wiring Terminals – One-Stop Part Number & Application Reference

In industrial automation, equipment manufacturing, and control cabinet wiring scenarios, terminal blocks are critical for secure, organized, and reliable electrical connections. The Phoenix ST series terminal blocks stand out with multiple pole count options, industrial-grade durability, and flexible wiring designs, covering 3-pole, 5-pole, and 8-pole configurations to meet diverse wiring needs. With corrosion-resistant materials, stable current/voltage carrying capacity, and easy installation, the ST series is widely used in factory floors, mechanical equipment, and control systems. This guide integrates part number-model correspondence, core technical parameters, and scenario-specific recommendations to simplify selection and procurement, helping you quickly lock in optimal wiring terminal solutions.

I. Core Advantages: Why Choose the Phoenix ST Series?

• Multiple pole count options: 3-pole, 5-pole, 8-pole configurations to match different wiring density requirements (from small equipment to large control cabinets).
• Industrial-grade reliability: Made of flame-retardant PA material (UL94 V0), operating temperature range of -40°C to +100°C, resistant to vibration and chemical corrosion.
• Secure wiring design: Screw-type connection (with "S" suffix models featuring reinforced fixing) ensures tight contact, preventing loosening due to industrial vibration.
• Wide current/voltage compatibility: Rated voltage up to 800V, rated current up to 32A, adapting to low-voltage signal wiring and medium-power circuit connections.
• Easy integration: DIN rail mounting (compatible with standard 35mm DIN rails), compact design, and clear pole marking for efficient control cabinet layout.

II. Complete Product Series Selection Table (Part Number + Model + Core Information)

1. 8-Pole Terminal Blocks (High-Density Wiring)

Suitable for multi-signal or multi-circuit wiring scenarios (e.g., control cabinet main distribution, large equipment wiring).

2. 5-Pole Terminal Blocks (Medium-Density Wiring)

Balanced pole count for general industrial wiring (e.g., sensor/actuator signal grouping, equipment intermediate connections).

3. 3-Pole Terminal Blocks (Low-Density/Small-Space Wiring)

Ideal for small equipment, compact control panels, or single-circuit wiring (e.g., power supply connections, small motor wiring).

III. 3-Step Quick Selection Technique (Easy for Beginners)

Step 1: Determine Pole Count Based on Wiring Density

• High-density (8-pole): Multi-signal/multi-circuit integration (e.g., control cabinet main distribution) → 1624639, 1613606.
• Medium-density (5-pole): General signal grouping (e.g., 5-channel sensor wiring) → 1618620, 1618768.
• Low-density (3-pole): Small equipment/compact panels (e.g., power supply connections) → 1624538, 1607689.

Step 2: Select Type (ES/EP) Based on Reliability Requirements

• Standard reliability (ES): General industrial scenarios, cost-sensitive projects → 1624538, 1607688.
• Enhanced reliability (EP): Critical circuits, high-vibration environments → 1624535, 1607670.

Step 3: Confirm Special Requirements

• Fixing method: Vibration-prone environments → Select models with "S" suffix (reinforced fixing, e.g., 1624538).
• Terminal type: Special wiring (grounding, high-precision signal) → Choose models with "K/CK/WQ" suffix (e.g., 1618402 with CK-type terminal).
• Installation environment: Indoor stable environment → Non-"S" models (e.g., 1624537) for cost optimization.

IV. Recommended Industry-Scenario Combinations (Ready-to-Use)

V. Selection Pitfall Avoidance Guide (Common Mistakes to Note)

1. Pole count mismatch: Overlooking actual wiring quantity (e.g., using 3-pole for 5-channel sensor) → Confirm pole count before selection (8/5/3 corresponds to wiring channels).
2. Ignoring vibration resistance: Vibration-prone environments (e.g., mechanical arms) using non-"S" models → Select "S" suffix (reinforced fixing) to prevent loosening.
3. Type selection error: Critical circuits using ES instead of EP models → EP series offers enhanced reliability for safety-related wiring.
4. Terminal type neglect: Special functions (grounding) using standard terminals → Choose "K/CK/WQ" suffix models for matching wiring needs.
5. Current/voltage overload: Exceeding terminal ratings (max 800V/32A) → Confirm system voltage/current before selection to avoid overheating.
6. Fixing method oversight: DIN rail mounting using non-standard fixing → All ST series support 35mm DIN rails; "S" models add extra fixing for stability.

Conclusion: Select the Right ST Terminal Block for Secure Wiring

The Phoenix ST series provides flexible, reliable wiring solutions for industrial scenarios, with pole count options (3/5/8) and type variants (ES/EP) adapting to diverse density and reliability requirements.