RT18-125AM 4P DIN Rail Fuse Holder 125A 690V

In TN-S and TN-C-S distribution systems, complete isolation means disconnecting all three phase conductors and the neutral — leaving any one unfused creates a hazard when the neutral shifts under unbalanced load. The Soltree RT18-125AM 4P solves this with four independent fuse positions in one 140mm-wide (4-module) housing, providing full 3P+N fuse protection in a single DIN rail component. Typical applications include large HVAC system feeds, motor control centers serving unbalanced loads, main distribution boards in commercial buildings and any switchgear where full four-wire fuse isolation is required by the system design or local wiring regulations. Four yellow indicator windows — one per pole — allow maintenance teams to identify a faulty phase or neutral fuse without probing live conductors. Thickened copper conductors (conductivity >98%) hold contact resistance below 5mΩ and transmission efficiency above 99.5% across all four poles simultaneously. Rated 125A / 690V, it accepts Φ22×58mm cylindrical fuse links (63A / 80A / 100A / 125A, sold separately). Large wiring terminals and premium screws provide secure, vibration-resistant connections. Every unit is 100% electrically tested at our ISO 9001 certified facility before shipment. Note: fuse links are NOT included.