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Brand: Phoenix Contact
Phoenix Contact STEP3-PS/1AC/24DC/5/PT Power Supply 24 V 5 A
Description
STEP3-PS/1AC/24DC/5/PT power supply, 24 V DC 5 A for distribution boards
The STEP3-PS/1AC/24DC/5/PT (item number 1088478) is a compact STEP POWER supply that delivers 24 V DC at 5 A, or 120 W, from a 100 to 240 V AC mains. It is designed for building automation and for installation in surface-mounted or flush-mounted distribution boards: the housing is only 72 mm wide, corresponding to four modular divisions on the DIN 43880 pitch, and the push-in terminals (the PT in the name) allow tool-free wiring. Seven Star LLC supplies the STEP3-PS/1AC/24DC/5/PT in Oman and the GCC as an independent supplier in Muscat and this page summarises the manufacturer data for panel builders and electrical contractors.
Decoding STEP3-PS/1AC/24DC/5/PT
- STEP3-PS: STEP POWER power supply, third generation.
- 1AC: single-phase AC input.
- 24DC: 24 V DC output.
- 5: nominal output current of 5 A, giving 120 W.
- PT: push-in terminal connection.
STEP3-PS/1AC/24DC/5/PT technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Phoenix Contact STEP3-PS/1AC/24DC/5/PT, item no. 1088478 |
| Input voltage range | 100 V AC … 240 V AC (-15 % … +10 %); 110 V DC … 250 V DC (-10 % … +40 %) |
| Frequency | 50 Hz … 60 Hz (±10 %) |
| Mains buffering | typ. 20 ms at 120 V AC and 230 V AC |
| Inrush current | typ. 37 A; I2t typ. 0.4 A2s; discharge current to PE < 0.25 mA |
| Output voltage | 24 V DC nominal, adjustable 22 … 27 V DC |
| Output current / power | 5 A / 120 W |
| Efficiency | > 93 % (120 V AC), > 94.5 % (230 V AC); Efficiency Level VI |
| Residual ripple | typ. 150 mVPP |
| Output protection | Short-circuit and no-load proof; overvoltage limit < 35 V DC; feedback voltage resistance ≤ 35 V DC |
| Parallel / series | Parallel with diode for power increase and redundancy; series for higher voltage |
| Ambient temperature | -10 °C … +70 °C, derating above 50 °C (2 %/K); start-up type tested -25 °C |
| MTBF (IEC 61709, SN 29500) | > 750,000 h at 40 °C (230 V AC) |
| Protection / class | IP20, protection class II in a closed control cabinet |
| Dimensions / weight | 72 x 90 x 61 mm (W x H x D); 4 modular divisions; 255 g |
| Safety standards listed | IEC 61010-1 (SELV), IEC 61558-2-16, DIN EN 60335-1 household approval; UL/C-UL listed UL 61010-1 |
Why the STEP3-PS/1AC/24DC/5/PT suits distribution boards
The manufacturer designs the STEP3-PS/1AC/24DC/5/PT to the dimensional conventions of electrical distribution boards (VDE 0603-1, DIN 43871), which is why the height is only 90 mm and the pitch is expressed in modular divisions. The housing is polycarbonate, the protection class is II and the unit carries a household-equipment approval under DIN EN 60335-1 in addition to the usual industrial safety listings, so it can be installed in residential or commercial distribution as well as machine cabinets. Efficiency Level VI means low no-load and part-load consumption, relevant for building installations that run around the clock.
Performance notes and limits
The STEP3-PS/1AC/24DC/5/PT has no boost reserve, SFB pulse or signal outputs in the data sheet summary, so it should be sized for the real load. Residual ripple of typically 150 mV peak to peak is acceptable for building controllers, relays and lighting drivers but should be checked against sensitive analogue equipment. Inrush current of about 37 A for a short period means the upstream miniature breaker must be of a suitable characteristic, and several units on one breaker need coordination. Between 50 and 70 °C the output must be derated by 2 % per kelvin, and the specified minimum operating temperature of -10 °C means unheated outdoor enclosures need extra care.
Related types
The STEP3 series continues with 24 V units of 0.63 A, 4 A, 13 A and 25 A in the same push-in design, plus a KNX bus supply and a USB power-delivery model. For industrial duty with higher power or boost reserves, the manufacturer offers the QUINT4-PS/1AC/24DC/5 at the same current rating and the TRIO-PS-2G types. The STEP3-PS/1AC/24DC/5/PT is the economical choice where the load is steady and the environment is benign.
Selection checklist
- Add up the 24 V loads and keep the sum well below 5 A.
- Confirm the supply: single-phase 100 to 240 V AC, or DC within the stated range.
- Check ambient temperature in the board against the 50 °C derating start.
- Verify that the housing width of four divisions fits the DIN 43880 row.
- Choose the upstream breaker with enough margin for 37 A inrush.
- Decide whether parallel redundancy with an external diode is needed.
Installation and commissioning
Snap the STEP3-PS/1AC/24DC/5/PT onto a DIN rail or screw it to a plane surface, insert stripped conductors directly into the push-in terminals at the 45 degree angle, and adjust the output voltage with the potentiometer between 22 and 27 V DC while checking the load. Because the unit is protection class II in a closed control cabinet, the PE connection requirements should follow the installation manual supplied with the unit. Keep the ventilation openings clear and re-check the output voltage after any change in load.
Typical applications in Oman and the GCC
Typical uses are distribution boards in commercial buildings, hotel and villa automation, lighting and shading control, small plant-room panels, CCTV and access-control cabinets, and auxiliary supplies in packaged equipment. Hot enclosures should be checked against the derating curve.
Information to send with an RFQ
- Full type designation or item number, and quantity
- Mains voltage and frequency at site, and whether the supply is AC, DC or three-phase
- Total load current including inrush and motor starting, plus any redundancy or parallel-operation requirement
- Ambient temperature range, altitude and cabinet ventilation
- Required approvals such as marine, hazardous-area or UL, and any project specification references
- Delivery location and required documents
Documents and quotation
The manufacturer data sheet for the STEP3-PS/1AC/24DC/5/PT is attached to this page.
Send item number 1088478, quantity and delivery location to Seven Star LLC and request a quotation.
Datasheets & Documents
- Datasheet Phoenix Contact STEP3-PS/1AC/24DC/5/PT Datasheet Download
Reviews (0)
About brand
Phoenix Contact is a German, family-owned manufacturer of electrical connection technology and industrial automation, founded in 1923 in Essen by Hugo Knümann. It began as a sales company, and in 1928 Knümann developed the modular terminal block mounted on a rail, the product the company is still best known for. Phoenix Contact is headquartered in Blomberg, North Rhine-Westphalia.
Seven Star LLC lists Phoenix Contact surge protection, power supplies and safety relays, and sources these components by order number for panel builders and maintenance teams in Oman.
Phoenix Contact company profile
| Founded | 1923, Essen, Germany, by Hugo Knümann, as Phönix Elektro- und Industrie-Bedarfsgesellschaft |
|---|---|
| Headquarters | Blomberg, Germany |
| Ownership | Family-owned (Eisert and Stührenberg families) |
| Key invention | The modular terminal block on a DIN rail, 1928 |
| Product families | CLIPLINE terminal blocks, PCB terminals and connectors, QUINT and TRIO power supplies, relay modules, surge protection, signal conditioners, Ethernet switches and PLCnext controllers |
Milestones
- 1923: Hugo Knümann founds the company in Essen.
- 1928: The first modular terminal block is developed.
- Later: Headquarters move to Blomberg, Ostwestfalen-Lippe.
Phoenix Contact parts listed on this page
The TTC-6-2X1-24DC-UT (order number 2906799) is a surge protection device with screw connection for two 24 V DC signal wires that share a common reference potential. The QUINT-PS/1AC/24DC/10 is a single-phase DIN rail power supply delivering 24 V DC at 10 A. The PSR-SCP-24DC/ESP4/2X1/1X2 (order number 2981020) is a single-channel PSR safety relay for emergency stop and safety door monitoring, with two enabling current paths and plug-in screw terminals.
Phoenix Contact products we list
Ordering Phoenix Contact components: what we need
Phoenix Contact items are ordered by a seven-digit order number together with the type designation, both printed on the side of the module. Send both, plus the quantity. If the number is unreadable, send the type text and a photo. For power supplies, state input voltage, output current and whether the unit runs in parallel or with a redundancy module. For buyers in the GCC replacing an older unit, we check the manufacturer's documentation for the listed successor type.
Facts checked against Phoenix Contact's own company history (phoenixcontact.com), October 2026.
Browse Phoenix Contact products by category: Isolator & Barrier, Power Modules, Automation Accessories.
FAQ
Questions about the Phoenix Contact STEP3-PS/1AC/24DC/5/PT Power Supply
Answers from our engineering team on installation, compatibility and integration.
01What output does the STEP3-PS/1AC/24DC/5/PT provide?
It supplies 24 V DC at 5 A (120 W). The output voltage is adjustable between 22 and 27 V DC.
02What does PT mean in the name?
PT stands for push-in terminal connection, which allows tool-free wiring of the input and output conductors.
03How large is the unit?
The data sheet gives 72 x 90 x 61 mm (width x height x depth), four modular divisions on the DIN 43880 pitch, and a weight of 255 g.
04What is the efficiency?
Efficiency is above 93 percent at 120 V AC and above 94.5 percent at 230 V AC, and the unit meets Efficiency Level VI.
05What is the operating temperature?
The ambient operating range is -10 to +70 degrees C with derating of 2 percent per kelvin above 50 degrees C; start-up is type tested at -25 degrees C.
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