WAGO Rail-Mount Terminal Blocks with Screw and Stud Connection

WAGO Rail-Mount Terminal Blocks with Screw and Stud Connection

Detailed explanation of the core terminal block series

（1） 883 series (screw connected terminal block)

1. Product type and specifications

Nominal cross-sectional area Product type Suitable conductor range (mm ²) Rated current (IN) Terminal block width (mm) Tightening torque (Nm) Screw specifications Operating tool

35mm ² straight/ground/power tap changer 1.5-50 (s+st+f-st) 125A (150A) 16.1 3.2-3.7 M6 flathead screwdriver (6.5 × 1.2mm)

70mm ² straight/ground/power tap 10-95 (s+st), 10-70 (f-st) 192A (232A) 20.5 6-12 M8 T-shaped wrench (6mm)

120mm ² straight through/power tap 16-150 (s+st), 16-120 (f-st) 269A (290A) 27 12-20 M10 T-shaped wrench (6mm)

240mm ² straight/power tap 70-240 (s+st+f-st) 380A 36 10-20 M10 T-shaped wrench (8mm)

2. Key characteristics

Insulation and flame retardant: The material is Polyamide 66 (PA66), and the flame retardant rating is UL 94 V0 (35/70/120mm ²), V2 (240mm ² and 10mm ² small specifications)

Voltage parameters: rated voltage 1000V, rated impulse voltage 8kV, pollution level 3

Installation method: Snap on installation on DIN rail, disassembly requires pushing back the movable buckle and tilting it; The grounding terminal block contacts the DIN rail through the grounding foot

Common connection: achieved by inserting 2/3/4 jumper wires into the jumper slot, and the jumper wires are adapted to the rated current of the terminal block

3. Typical models and packaging (PU)

Product type, color, model, packaging quantity (PU)

35mm ² straight through terminal block gray 883-3501 20

35mm ² grounding terminal block yellow green dual color 883-3507 20

70mm ² power tap beige 883-7030 10

120mm ² straight through terminal block blue 883-1204 5

240mm ² straight through terminal block gray 883-2401 5

（2） 884 series (double screw terminal block)

1. Product specifications and parameters

Nominal cross-sectional area, screw specifications, suitable conductor range (mm ²), rated current (IN), terminal block width (mm), tightening torque (Nm), operating tool

35mm ² M6 2.5-50 125A 27 3-6 open-end/plum blossom/socket wrench (10mm)

70mm ² M8 2.5-95 192A (232A) 32 6-12 open-end/plum blossom/socket wrench (13mm)

120mm ² M10 6-120 269A (290A) 42 10-20 open/plum/socket wrench (17mm)

185mm ² M12 10-185 353A 55 14-31 open-end/plum blossom/socket wrench (19mm)

300mm ² M16 25-300 520A 55 25-60 open-end/plum blossom/socket wrench (24mm)

2. Core Features

End connection capability: Each stud can connect up to 2 cable joints (back-to-back installation), and the hexagonal flange nut needs to be tightened with torque

Protective design: Can be equipped with terminal cover (beige/blue, such as 884-3580), the cover can be cut, and can be installed on both sides to prevent electric shock

Installation flexibility: snap fit on DIN rail, bottom long hole can be directly screwed onto a flat surface

3. Typical models and packaging

Nominal cross-sectional area, color, model, packaging quantity (PU), matching jumper model

35mm ² beige 884-3500 10 884-3542 (2 routes)

70mm ² beige 884-7000 10 884-7043 (3 routes)

120mm ² beige 884-1200 5 884-1242 (2 routes)

300mm ² beige 884-3000 5 884-3043 (3 routes)

（3） 885 series (single/three screw terminal block)

1. Product classification and parameters

Type: Stud specifications, nominal cross-sectional area, rated current (IN), terminal block width (mm), tightening torque (Nm), operating tool

Single bolt M6 35mm ² 125A 17.8 3-6 wrench (10mm)

Single screw M8 50mm ² 150A 22.8 6-12 wrench (13mm)

Single bolt M10 120mm ² 269A 33.8 10-20 wrench (17mm)

Single bolt M12 120mm ² 269A 33.8 10-20 wrench (19mm)

Three bolt M6 35mm ² 125A 17.8 3-6 wrench (10mm)

Three bolt M10 120mm ² 269A 33.8 10-20 wrench (17mm)

2. Core Features

Termination capability: up to 3 cable connectors (compliant with DIN 46234/46235), with anti loosening washers required

Auxiliary accessories: including partition board (with/without jumper slot), empty shell (for occupying space), 1m long transparent cover (with fixing clip)

Public connection: achieved through 2/3 jumper wires, can be equipped with variable diameter jumper wires (such as M8 to M6: 885-448)

3. Typical models and packaging

Type, Color, Model, Packaging Quantity (PU), Divider Plate Model

Single screw column (M6) gray 885-106 25 885-526

Single screw column (M10) gray 885-110 20 885-530

Three bolts (M8) gray 885-308 20 885-548

Three bolts (M10) gray 885-310 10 885-550

Accessories and supporting systems

（1） Terminal block accessories

Attachment Type Adaptation Series Model Example Specification/Characteristics Packaging Quantity (PU)

Insulated jumper 883 series 883-3542 2-channel, yellow 20

Non insulated jumper 884 series 884-7043 3-channel, compatible with M8 stud 10

High voltage warning label series 883-1286 yellow, with lightning symbol 10

Flat cable insertion board 883 series 883-7099 non insulated, compensating V-shaped structure 10

Screw free end block full series 249-117 10mm wide, gray, DIN-35 guide rail 100 (25)

（2） Marking system

Tag Type Specification Color Options Model Example Packaging Quantity (PU)

WMB card style 5mm white/yellow/red/blue/gray/orange/light green/green/purple 793-501 5 (10 strips x 10 pieces)

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;

Regular inspection: Check the connection torque and protection status every 3-6 months, and promptly address any oxidation or looseness found.

Question 3: What are the structural differences, termination capabilities, and applicable scenarios of WAGO 884 and 885 series screw terminal blocks?

Answer:

(1) Structural differences

Comparison item 884 series (double screw) 885 series (single/triple screw)

Number of bolts 2 (fixed spacing, same specifications) 1 or 3 (single bolt independent, three bolts side by side)

The width of the terminal block increases with the increase of cross-sectional area (27-55mm). The single screw column is 17.8-33.8mm, and the three screw columns are the same as the single screw column

Installation method: snap on+bottom long circular hole (flat installation) snap on (DIN rail only)

Protective accessory special cover (can be cut, single/double-sided installation) 1m long transparent cover (with fixing clip, overall protection)

(2) End connection capability

884 series: Each stud can connect up to 2 cable connectors (back-to-back installation), supporting 2.5-300mm ² conductors and compatible with DIN 46234/46235 connectors;

885 series: A single stud can connect up to 3 cable connectors, and each stud of the three studs can be independently terminated (with different cross-sectional area conductors), supporting 2.5-120mm ² conductors.

(3) Applicable scenarios

884 series: suitable for high current, multi conductor parallel scenarios (such as main circuit of distribution cabinet, industrial motor power input), requiring 2 conductors to be connected simultaneously and with high current (such as 300mm ² conductor, 520A current);

885 series: Single screw is suitable for single circuit independent connection (such as instrument signal input, small equipment power supply); Three screws are suitable for centralized layout of multiple circuits (such as power distribution of multiple branches in a control cabinet), which requires saving installation space and a small number of circuits (within 3 circuits).