WAGO Rail-Mount Terminal Blocks with Screw and Stud Connection

WMB roll pack 5-5.2mm white 2009-115 1 (1500 pieces)

Mini WSB card style 5mm and WMB card style 248-501 5 (10 pieces x 10 pieces)

Marking carrier 5mm wide gray 2009-198 200 (25)

Marking strip 11mm wide white 2009-110 1 (50m/roll)

（3） DIN rail and installation tools

1. DIN rail specifications

Material size (mm) Thickness (mm) Length (m) Rated current carrying capacity (A/m) Model Packaging quantity (PU)

Steel 35 × 15 1.5 2 125 210-114 10 (1)

Steel 35 × 15 2.3 2 125 210-118 10 (1)

Copper 35 × 15 2.3 2 309 210-198 10 (1)

2. Aluminum conductor termination tool

Contact paste: model 249-130, 20ml/tube, acid-base neutral, used for preventing oxidation after removing the oxide layer of aluminum conductors

Scraper: specialized for cleaning the oxide layer on the surface of aluminum conductors

Tightening requirements: After the initial tightening, it needs to be tightened again to the rated torque a few days later, and reconnection requires repeated processing

Technical specifications and installation requirements

1. General environmental and material requirements

Working temperature: -35...+105 ° C (full range)

Insulation material: Polyamide 66 (PA66), excellent weather resistance and mechanical strength

Flame retardant rating: UL 94 V0 (mainstream specification), V2 (small cross-sectional area such as 10mm ²)

Pollution level: Level 3 (applicable to industrial environments, with a small amount of dust but no obvious pollution)

2. Special requirements for aluminum conductor termination

Suitable conductor type: only supports round solid (RS), fan-shaped solid (SS, α=90 °, conductor grade 1) aluminum conductors

Prohibited scenario: Copper aluminum transition joints are required in humid or corrosive environments and cannot be directly connected

Operation steps: ① Scrape off the oxide layer → ② Dip in contact paste → ③ Insert the terminal block → ④ Tighten with torque → ⑤ Re tighten after a few days

3. Testing and maintenance

Voltage Test: It can be measured using a 206-707 2-pole voltage tester by operating the screw head inside the slot

Tag maintenance: Using WMB/Mini WSB system, tags can be quickly replaced and adapted to terminal block receptors

Regular inspection: Aluminum conductor connections require regular torque checks to prevent looseness

Key issue

Question 1: What are the differences in core parameters (rated current, tightening torque, operating tools) for different nominal cross-sectional areas of WAGO 883 series screw connection terminal blocks? How to choose the appropriate terminal block specifications?

Answer:

(1) Differences in core parameters of different cross-sectional areas

Nominal cross-sectional area, rated current (IN), tightening torque (Nm), screw specifications, operating tool

35mm ² 125A (150A) 3.2-3.7 M6 flathead screwdriver (6.5 × 1.2mm)

70mm ² 192A (232A) 6-12 M8 T-shaped wrench (6mm)

120mm ² 269A (290A) 12-20 M10 T-shaped wrench (6mm)

240mm ² 380A 10-20 M10 T-shaped wrench (8mm)

(2) Selection criteria

Conductor cross-sectional area: The nominal cross-sectional area of the terminal block should cover the actual range of conductor cross-sectional areas (such as a 35mm ² terminal block compatible with 1.5-50mm ² conductors);

Rated current: The terminal block IN must be greater than or equal to the maximum operating current of the circuit (e.g. 120mm ² terminal block IN=269A, suitable for a maximum 269A circuit);

Installation space: The width of the terminal block increases with the increase of cross-sectional area (35mm ² is 16.1mm, 240mm ² is 36mm), which needs to be selected based on the space of the distribution box;

Operating tools: Use a screwdriver for small cross-sectional areas (35mm ²) and a T-shaped wrench for large cross-sectional areas (70mm ² and above), matching the on-site tool conditions.

Question 2: How to achieve reliable connection between aluminum conductors and WAGO terminal blocks in humid or corrosive environments? What special operating procedures should be followed?

Answer:

(1) Connection scheme

In humid or corrosive environments, direct connection of aluminum conductors is prohibited. Copper aluminum transition joints (such as aluminum conductor crimping joints with copper connection studs) should be used. The specific adaptation is as follows:

Screw connection (883 series): After crimping the copper aluminum transition joint with the aluminum conductor, connect it according to the normal terminal connection method of the terminal block (insert the clamping unit → tighten the screw);

Screw connection (884/885 series): After crimping the copper aluminum transition ring joint with the aluminum conductor, tighten it in conjunction with the screw (with anti loosening washer).

(2) Special operating procedures

Joint selection: Transition joints must comply with DIN 46234 (uninsulated crimping joints) or DIN 46235 (covered crimping joints), with a cross-sectional area that matches the conductor;

Crimping requirements: Use specialized crimping tools to crimp according to the joint specifications, ensuring that there is no looseness or damage at the crimping point;

Sealing protection: The connection part can be additionally wrapped with waterproof tape or covered with waterproof heat shrink tubing to prevent moisture from entering;