Terminal Block 2.5mm 24A
Terminal Block 2.5mm 24A
Blog Article
Terminal Block (2.5mm² / 24A) – Selection Guide
Terminal blocks are used for secure electrical connections in control panels, industrial machinery, and power distribution. Below are key specifications for a 2.5mm² (24A-rated) terminal block, including types, brands, and installation tips.
???? 1. Key Specifications
| Parameter | Details |
|---|---|
| Conductor Size | 2.5mm² (AWG 14-12) |
| Current Rating | 24A (typically at 30°C ambient) |
| Voltage Rating | 300V–600V (AC/DC) |
| Pitch (Spacing) | 5mm–7.62mm (common) |
| Material | Polyamide (PA66) – Flame-retardant (UL94 V0) |
| Screw Type | M3 or M3.5 (torque ~0.5–0.6 Nm) |
| Mounting | DIN rail (35mm), PCB, or direct panel mount |
???? 2. Types of Terminal Blocks
(A) Barrier Terminal Blocks
Use: High-current connections (24A+).
Features:
Screw clamps for secure wire retention.
Isolated barriers prevent short circuits.
(B) DIN Rail Terminal Blocks
Use: Industrial control panels (PLC wiring).
Features:
Snap onto 35mm DIN rail (TS35).
Stackable (feed-through, grounding, fused types).
(C) Push-In Terminal Blocks
Use: Quick wiring (no screwdriver needed).
Features:
Spring-loaded clamps (suitable for solid/core wires).
Faster installation than screw types.
(D) Pluggable Terminal Blocks
Use: Modular systems (easy maintenance).
Features:
Male/female connectors for tool-less disconnection.
???? 3. Top Brands & Models
| Brand | Model Example | Type | Key Feature |
|---|---|---|---|
| Phoenix Contact | UK 2.5N | Screw clamp | DIN rail, 24A, 600V |
| Wago | 221-413 | Push-in | Lever-actuated, reusable |
| Weidmüller | WDU 2.5 | Screw | High vibration resistance |
| ABB | TA25-QUATTRO | Feed-through | 4-level, 24A |
| TE Connectivity | 1776286-1 | Barrier block | PCB mount |
???? 4. Wiring Guidelines
Strip Length: 8–10mm (for 2.5mm² wire).
Torque: 0.5–0.6 Nm (avoid over-tightening).
Wire Types:
Solid core (best for screw terminals).
Stranded (use ferrules for push-in types).
Safety:
Ensure IP20 (basic protection) or higher for harsh environments.
Separate high/low voltage terminals.
???? 5. Applications
✔ Control panels (PLC I/O wiring)
✔ Power distribution (24A circuits)
✔ HVAC systems
✔ Renewable energy (solar inverters)
???? 6. Ordering Checklist
Current Rating: 24A (verify derating for high temps).
Voltage: 300V (standard) or 600V (industrial).
Pitch: 5mm (compact) or 7.62mm (standard).
Mounting: DIN rail, PCB, or panel.
Certifications: UL, IEC 60947, CE.
???? Need a specific recommendation?
Specify:
Mounting type (DIN rail, PCB, etc.).
Connection method (screw, push-in, spring).
Environment (high-vibration, outdoor, etc.).
Example:
"DIN rail, screw clamp, 600V, UL-listed" → Phoenix Contact UK 2.5N.
"Push-in, compact pitch (5mm)" → Wago 221-413https://store.unigulfsupply.com/product/terminal-block-2-5mm-24a-avk2-5/