Würth REDCUBE Terminal Blocks: 800V DC AI PSU Q3 2026

What this article answers in one sentence

For a Q3 2026 30 kW AI server PSU designer: the active-production Würth REDCUBE catalog parts that land the 800 VDC feeder and +48 V sub-rail on the PCB, the MPNs to put on the BOM, and where the Amphenol TS1 launch shifts the supply curve.

The rest of the article is the data and the context behind that sentence.

The four REDCUBE catalog parts that exist for the 30 kW PSU

Every MPN cited below is verified against the canonical catalog, lifecycle status Active, through-hole solder mount, tin-plated brass contact, current rating confirmed against the spec sheet.

74650195R — REDCUBE WP-THRBU M5 9-pin (catalog id 166708). Current 85 A. Mounting Through Hole. Termination Solder. Number Of Pins 9. Contact Material Brass. Package Tape & Reel (TR); Cut Tape (CT). The M5 hex is sized for 6 AWG through 2 AWG ring lugs. The 85 A continuous rating gives 2.3× margin against a 37.5 A 800 VDC 30 kW feeder peak.

74650194R — REDCUBE WP-THRBU M4 9-pin (catalog id 166413). Current 85 A. Same nine-pin count, same brass-and-tin contact, smaller M4 hex for layouts where the bus bar keep-out zone physically cannot fit an M5 pad. The M4 and M5 REDCUBE WP-THRBU 9-pin parts are electrically interchangeable; the choice between them is PCB layout, not electrical.

74651195R — REDCUBE WP-THRSH 9-pin (catalog id 166377). Current 85 A. The straight-horizontal sister to WP-THRBU; the mechanical difference is footprint orientation. WP-THRBU is right-angle busbar-friendly landing; WP-THRSH is straight-horizontal exit through the same PCB plane.

74651175R — REDCUBE WP-THRSH 4-pin (catalog id 166716). Current 50 A. The 50 A variant for +48 V sub-rail branches that do not carry the full 800 VDC feeder current. Half the pin count of the 74651195R; identical brass contact system.

For the control-side wiring — system management controllers, fan tach, PSU present, PMBus address bits — the catalog carries the WR-TBL 4122 wire-to-board family. 691412220009M — WR-TBL Series 4122 9-position 45° entry (catalog id 171435) is the 7.00 mm pitch, 4 A continuous, 300 V, 16-30 AWG via screwless push-in spring termination, polyamide (PA66) housing, phosphor-bronze tin-plated contacts, Lifecycle Status Active. The mating 4123 series at 7.50 mm pitch shares the push-in architecture.

The control-side 4 A push-in blocks are not the high-current family. They are the screwless signal-side fan-out parts that handle auxiliary 12 V, 5 V, and 3.3 V outputs to the system management board. Conflating the two families at the BOM stage is the single most common error in 30 kW AI PSU design today.

Why this matters in Q3 2026 — the four market signals behind the catalog parts

NVIDIA publicly retired the 24-pin ATX edge connector as the universal vocabulary of PC power on 16 March 2026 with the 800 VDC Architecture for AI Data Centers reference. The same week, Navitas demonstrated an 800 V to 6 V Power Delivery Board at GTC 2026 that eliminates the intermediate bus converter stage entirely. On 1 April 2026, Electronic Products & Technology covered a second 800 V to 6 V reference design. On 2 June 2026, Onsemi and Infineon joined the NVIDIA MGX ecosystem to compete for 800 V power supply dominance in AI data centers. On 24 August 2026, Mouser Electronics and trade press (Electronic Design, timestech.in) covered the launch of Amphenol Industrial TS1 high-power PCB connectors for industrial, transportation, and energy applications. On 27 August 2026, Future Market Insights identified megawatt-class AI rack load emulation systems as an addressable market segment in its own right.

The four signals triangulate to a single buyer's question: which active-production high-current PCB terminal block goes on the 2026 BOM, and at what lead-time risk? The Würth REDCUBE answer is the four MPNs above. The Amphenol TS1 answer is a competitor family that just entered the channel. The NVIDIA / Navitas / Onsemi / Infineon / MGX signals are the reason both families are now in active demand.

How a 30 kW 800 VDC PSU allocates wire-side terminal blocks

The +800 V input and +48 V output bus landings each take one Würth 74650195R REDCUBE WP-THRBU M5 9-pin block. The 9-pin count is a packaging choice — single pins are placed at each conductor footprint, with remaining pins serving as mechanical keep-out zones for the high-current traces. For auxiliary 48 V branches, the 74651175R REDCUBE WP-THRSH 4-pin 50 A variant handles the smaller current paths without over-populating.

Where a vertical bus bar drops from the underside of the chassis, the WP-THRBU's right-angle landing is the correct footprint. Where the bus continues on the same plane, the 74651195R WP-THRSH 9-pin 85 A is the cleaner choice. The +12 V and +5 V auxiliary control outputs that fan out to the system management controller use the Würth 691412220009M WR-TBL 4122 9-position push-in blocks at 7.00 mm pitch, 4 A continuous, 16-30 AWG.

The pitfall worth flagging: high-pin-count horizontal blocks where the layout calls for two or three single pins in a row. REDCUBE WP-THRSH is sold in 4-pin and 9-pin strips but is designed to be cut to length. A designer who needs two adjacent pins can buy the 4-pin 74651175R and break off what is required. The brass contact is rated for hand-cutting without degradation as long as the cut end is filed clean and the next pin remains fully populated.

The M4 vs M5 question, answered in two lines

Use 74650195R M5 when the bus-bar landing pattern can spare the M5 hex keep-out zone — typically 12 mm pad-to-pad minimum. The M5 hex is the standard for 6 AWG through 2 AWG ring lugs and gives the strongest mechanical engagement for high-vibration chassis (e.g. mobile AI rack skids, transit-grade data center pods).

Use 74650194R M4 when the PCB real estate cannot spare the M5 keep-out, typically in 1U form factors where the bus trace is on an inner layer and exits through a via array under the terminal. The M4 hex accepts 10 AWG through 6 AWG ring lugs comfortably.

Both are 85 A continuous, both are REDCUBE WP-THRBU, both have nine pins. The M4 versus M5 decision is PCB layout. There is no electrical penalty for choosing either.

How the Amphenol TS1 launch reshapes supply for Q4 2026

The TS1 announcement matters less for what it changes today than for what it signals about the supply environment. Amphenol does not launch a high-current PCB terminal family unless it sees sustained demand from industrial, transportation, and energy customers — exactly the AI rack power, energy storage, EV DC fast charging, and photovoltaic inverter demand that NVIDIA 800 VDC, Navitas GTC 2026 demonstration, and Onsemi / Infineon MGX announcements all validate.

A sourcing desk in Shenzhen should expect REDCUBE pricing to tighten through Q4 2026 if Amphenol diverts capacity to TS1 ramp, and lead times on the M5 9-pin (74650195R) and M4 9-pin (74650194R) may stretch beyond 16 weeks if multiple tier-1 PSU OEMs move to volume at once. The launch is the signal; the supply curve is the implication. Independent-channel pricing on the four REDCUBE MPNs is currently stable, but a 12-16 week lead-time stretch on the high-current variants through Q4 2026 is a realistic planning assumption.

What independent channels actually buy you here

For a procurement team that is not on a franchise-direct allocation with Würth Elektronik, the independent channel matters most at the lot-size gap. The 74650195R, 74650194R, 74651195R, and 74651175R are all active production, but lead times on high-current Würth parts in Q3 2026 typically run 8-14 weeks at franchise distributors and tighter at independent brokers depending on lot size. The independent channel's role is to absorb the gap: a PSU designer who needs 500 pieces of 74650195R for a pilot build and 5,000 pieces for a Q1 2027 production run is usually better served by mixing the pilot quantity through an independent distributor with the production quantity reserved against Würth's own allocation, rather than competing with tier-1 OEM buyers on the open distributor shelf.

MOQ for REDCUBE at the franchise channel is typically one reel (Tape & Reel packaging per the catalog spec on 74650195R and 74651195R) or one tube for the cut-tape parts. Independent channels can break reels below MOQ in many cases, which is exactly the gap they are best positioned to fill. For WR-TBL 4122 / 4123 the situation is more relaxed — these are higher-volume commodity-style parts with shorter lead times and independent-channel pricing tracks within 5-10 percent of franchise distribution.

The other independent-channel value is end-of-life coverage. REDCUBE has been stable for more than a decade, but specific pin counts or hex sizes do occasionally go through PCN cycles. When a designer has already tooled around the 9-pin WP-THRSH (74651195R) and the manufacturer announces a Last Time Buy on a variant, the independent channel is usually the only source for the legacy pin count during the bridge to a redesign. Spec-for-spec cross-references between REDCUBE and Phoenix Contact MPT or Weidmüller WPD are not generally safe at the PCB-footprint level — the bus-bar pad pattern and the hex keep-out zone differ enough that a Würth-to-Phoenix swap requires board rework, not just a BOM change.

What to track through Q4 2026 and into 2027

Three forward-looking signals. First, the NVIDIA 800 VDC ramp moves from reference architecture to OEM design wins — the question is whether the first production racks use Würth REDCUBE-style screw terminals or move to a bus-bar-direct PCB interface like Amphenol TS1. Second, the Amphenol TS1 ramp will pressure Würth pricing on the M5 9-pin (74650195R) and may pull some buyers to TS1 for new designs, but Würth's incumbent position at tier-1 server OEMs and EV charging integrators means REDCUBE is unlikely to be displaced in 2026. Third, the megawatt-class AI rack emulation system market, an addressable segment as of late August 2026, will create new demand for >100 A PCB terminals that REDCUBE does not currently serve — Würth will either extend the family or lose that segment to a competitor.

The honest scope: REDCUBE WP-THRBU / WP-THRSH is a through-hole brass-body M4 / M5 screw terminal family with a 50 A or 85 A continuous rating per pin. It is the right choice for AI rack PSUs, EV DC fast charging modules, and energy storage converters that need a screw-lugged wire landing on the PCB. It is the wrong choice for high-vibration sealed automotive applications (TE Deutsch DT / DTM or Molex MX150 are the correct families there), and it is not a surface-mount part (where Würth's SMT-mount blocks or Amphenol TS1 are the relevant alternatives). For the specific question — how to land the 800 VDC and +48 V bus on a 30 kW AI rack PSU in Q3 2026 with active-production catalog parts — the four REDCUBE MPNs above are the working answer.

A sourcing desk in Shenzhen running this kind of design pairs the REDCUBE MPNs with the WR-TBL 4122 / 4123 control-side parts, verifies the M5 hex footprint against the bus-bar landing pattern, and confirms MOQ against the pilot-versus-production split. Inquiries on these families through independent channels can move into 24-48 hour quote turnaround with full traceability to Würth lot codes, and lead times for pilot quantities are typically 2-4 weeks shorter than direct Würth franchise allocation at the same price point. The four MPNs above are what the BOM gets built on; the rest of the build — chassis, bus bars, safety certifications — is a separate conversation.