WAGO 280 Series Terminal Blocks 280-905

Technical Dossier

Product Details And Specifications

WAGO 280 Series Terminal Blocks Technical Notes

The WAGO 280 series represents one of the most widely deployed DIN-rail feed-through terminal block families in global heavy industry. Installed across chemical processing plants, oil refineries, nuclear power facilities, and offshore platforms, the 280 series is recognized for its cage clamp connection technology, which eliminates the need for ferrules and delivers consistent contact force over decades of service. Its compact pitch (5 mm and 6 mm variants) and high current ratings (up to 32 A) make it a default specification in European and Asian industrial panel builds. The series is manufactured in Germany under WAGO's ISO 9001-certified production standards and carries UL, CSA, and ATEX approvals relevant to hazardous-area installations.

The Evolution of WAGO 280 Series Architecture

WAGO introduced the 280 series as part of its second-generation cage clamp terminal block platform, succeeding the earlier 261 and 264 series. The core innovation was the self-locking cage clamp mechanism, which applies a defined spring force to the conductor without requiring a separate clamping screw. This design reduced installation time by approximately 50% compared to screw-type terminals and eliminated the torque-related failures common in vibration-intensive environments.

Early 280-series variants (280-901 through 280-910) addressed single-conductor feed-through applications in 2.5 mm² and 4 mm² wire gauges. Subsequent revisions introduced ground (PE) variants with integrated DIN-rail bonding, fused disconnect versions for branch circuit protection, and multi-level configurations for high-density wiring. The series is now considered mature; WAGO's current active development is concentrated on the 2002, 2004, and 221 Compact Splicing Connector families. However, the 280 series remains in full production and is supported with a committed 10-year spare parts availability guarantee, making it the preferred choice for long-lifecycle plant maintenance programs where panel re-engineering is not economically viable.

Compatibility note: 280-series terminal blocks mount on standard 35 mm DIN rail (EN 60715) and are mechanically compatible with WAGO 281 and 282 series accessories including end brackets (280-311), partition plates (280-312), and test plugs (280-313). They are not electrically or mechanically interchangeable with the 2002 or 2004 series without panel modification.

WAGO 280 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core production range of the WAGO 280 series. All models use cage clamp termination unless otherwise noted.

Feed-Through Terminal Blocks

• 280-901: 1-conductor feed-through, 2.5 mm², 24 A, gray, 5.08 mm pitch
• 280-902: 1-conductor feed-through, 2.5 mm², 24 A, blue (neutral), 5.08 mm pitch
• 280-903: 1-conductor feed-through, 2.5 mm², 24 A, green-yellow (PE), DIN-rail bonding
• 280-904: 1-conductor feed-through, 4 mm², 32 A, gray, 6.35 mm pitch
• 280-905: 1-conductor feed-through, 4 mm², 32 A, blue (neutral), 6.35 mm pitch
• 280-906: 1-conductor feed-through, 4 mm², 32 A, green-yellow (PE), DIN-rail bonding
• 280-907: 1-conductor feed-through, 6 mm², 41 A, gray, 8 mm pitch
• 280-908: 1-conductor feed-through, 6 mm², 41 A, blue (neutral), 8 mm pitch
• 280-909: 1-conductor feed-through, 6 mm², 41 A, green-yellow (PE), DIN-rail bonding
• 280-910: 1-conductor feed-through, 10 mm², 57 A, gray, 10 mm pitch

Disconnect & Fused Variants

• 280-316: Disconnect terminal block, 4 mm², knife-disconnect, gray, test socket integrated
• 280-317: Disconnect terminal block, 4 mm², knife-disconnect, blue (neutral)
• 280-319: Fused terminal block, 4 mm², 5×20 mm fuse holder, gray
• 280-320: Fused terminal block, 4 mm², 5×20 mm fuse holder, with LED indicator
• 280-321: Double-level terminal block, 2×2.5 mm², dual-circuit feed-through, gray
• 280-322: Double-level terminal block, 2×2.5 mm², dual-circuit, blue (neutral)

Accessories & Markers

• 280-311: End bracket for 280 series, DIN-rail snap-fit, gray
• 280-312: Partition plate / separator, insulating, gray
• 280-313: Test plug, 4 mm banana socket, for 280-316/317 disconnect terminals
• 280-314: Jumper bar, 2-way, for 280-901 through 280-910

Quality Control for the WAGO 280 Series Range

Each WAGO 280 series unit processed through DriveKNMS undergoes the following verification steps before dispatch:

• Visual inspection: Cage clamp mechanism checked for spring integrity, housing checked for cracks or deformation from improper DIN-rail removal.
• Conductor insertion test: Test conductor inserted and extracted to verify clamp actuation force is within WAGO specification (no slippage, no excessive resistance).
• Contact resistance measurement: Four-wire Kelvin measurement confirms contact resistance below 1 mΩ per IEC 60947-7-1.
• Marking verification: WAGO logo, part number, current rating, and country-of-origin markings confirmed legible and matching the declared SKU.
• Packaging integrity: Original WAGO reel or box packaging confirmed intact; lot code and date code recorded for traceability documentation.