ABB SPTU240R1 – Compact 240 V AC Power/Transmitter Unit for Reliable 24 VDC Control Power

The ABB SPTU240R1 is commonly used as a compact power/conditioning unit in control panels to provide stable 24 VDC for I/O loops, field transmitters, and auxiliary control electronics. From my experience, it’s the kind of “fit-and-forget” module you drop on a DIN rail when you need dependable loop power from a 230/240 V AC supply without overcomplicating the cabinet. You might notice that it integrates neatly with ABB DCS and PLC panels, but it also works well in mixed-vendor cabinets where a clean 24 VDC rail is needed.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: typically 1 week for in-stock items; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express delivery options: FedEx, UPS, DHL

Key Features

• 240 V AC input, 24 VDC output – Ideal for powering field transmitters and control I/O loops from a single-phase mains feed.
• Stable, low-ripple DC – Helps reduce signal noise on analog loops; typically improves measurement stability in many cases.
• DIN-rail friendly – Compact footprint for crowded cabinets; wiring is straightforward for quick swap-outs.
• Industrial temperature tolerance – Suited for control rooms and MCC panels; typically handles common plant ambient ranges.
• Protection features – Overload and short-circuit protection are standard on this type of unit, preventing nuisance trips on the 24 V bus.
• Good fit for DCS/PLC panels – Plays nicely with ABB control systems and, in most cases, mixed brands as well.

Technical Specifications

Related or Supporting Products

• ABB SPTU120R1 – Similar concept with 120 V AC input; useful where panels run on 110/120 V mains.
• ABB CP-E 24/2.5 – DIN-rail power supply, 24 VDC/2.5 A; a solid alternative if higher current is needed for multiple loops.
• ABB CP-E 24/5.0 – 24 VDC/5 A; chosen when powering PLCs, relays, and instruments off a single 24 V bus.
• Loop Conditioners/Isolators (ABB/compatible) – If you need galvanic isolation or HART transparency alongside 24 V power, a dedicated isolator can be paired with SPTU240R1.

Installation & Maintenance

One thing I appreciate is how straightforward installation tends to be. Still, a few practical notes usually make the difference in long-term reliability.

• Cabinet environment – Mount on a 35 mm DIN rail inside a ventilated cabinet. Keep ambient within the stated operating range and allow some clearance for heat dissipation.
• Wiring – Use correctly sized conductors for the 24 VDC bus; keep sensor and analog loops separate from mains routing to minimize noise. Tighten terminals to the recommended torque.
• Protection – Provide upstream protection (MCB or fuse) on the AC feed. If the plant has frequent brownouts, a small UPS or surge protection typically helps.
• Grounding – Bond PE/ground per local codes; a clean protective earth usually reduces interference on sensitive loops.
• Routine checks – Quarterly visual inspection for dust buildup and terminal looseness works well in most cases. Verify 24 VDC output under load during scheduled maintenance.
• Spare strategy – Keeping one spare on the shelf often shortens downtime; swap-out is typically a matter of minutes.

Quality & Certifications

• CE compliant for EMC and safety (typical for ABB industrial power units)
• UL/cUL recognition where applicable
• RoHS compliant
• Manufactured under ISO 9001 quality systems
• Manufacturer’s warranty: 12 months (365 days)