Phoenix Contact STEP3-PS/1AC/24DC/4/PT Power Supply 4 A

STEP3-PS/1AC/24DC/4/PT: single-phase 24 V DC 4 A supply, 96 W, 72 mm wide

The Phoenix Contact STEP3-PS/1AC/24DC/4/PT (order no. 1140066) is the highest-power STEP POWER unit in this selection: 24 V DC at 4 A, 96 W, adjustable from 22 to 27 V DC. The housing is 72 mm wide, 90 mm high and 61 mm deep. Typical efficiency above 93 % at 120 V AC and above 94 % at 230 V AC is considerably higher than the smaller models.

Seven Star LLC supplies the STEP3-PS/1AC/24DC/4/PT as an independent supplier in Muscat for projects in Oman and the GCC, quoted against the exact part number shown here.

Technical specifications of the STEP3-PS/1AC/24DC/4/PT

How the STEP3-PS/1AC/24DC/4/PT works

The STEP3-PS/1AC/24DC/4/PT is a compact primary-switched supply from the STEP POWER range with push-in terminals. The AC input is rectified and switched at high frequency, an isolated transformer separates input from output and the secondary side is regulated to a fixed DC voltage that can be trimmed with the adjustment potentiometer. Protection features include a short-circuit-proof, no-load-proof output, an over-voltage limit on the output as listed in the table, and electronic protection on the secondary. A green LED shows when the output is above 90 % of nominal.

The higher efficiency means less waste heat in the enclosure, which matters when a distribution board is sealed. Push-in terminals, DIN rail and direct mounting options are the same as for smaller units.

Where the STEP3-PS/1AC/24DC/4/PT fits in a system

STEP POWER supplies are the economical end of Phoenix Contact power supplies: small plastic housings, no signalling contact and no boost functions, designed for distribution boards, building automation and small machines. They can be mounted on a DIN rail or directly on a panel, which gives flexibility in tight enclosures. When the application needs diagnostics, selectable characteristic or redundancy, step up to TRIO POWER or QUINT POWER.

The STEP3-PS/1AC/24DC/4/PT suits panels with a PLC plus a moderate I/O and HMI load. For loads above 4 A, TRIO POWER or QUINT POWER supplies such as 2903148 or QUINT4 devices are the next option.

Selection and ordering checklist

• Confirm the nominal output voltage and current of the STEP3-PS/1AC/24DC/4/PT and that the load total stays below it.
• Check the supply voltage and tolerance against the table, including low-voltage derating.
• Select the housing width that fits the distribution board and check the height and depth.
• Check temperature: the unit derates above 50 degrees C.
• Decide whether DIN rail or direct mounting is used.
• Check if a diode module will be needed for redundancy, because STEP supplies have no signalling contact.

Installation, commissioning and maintenance of the STEP3-PS/1AC/24DC/4/PT

Fit the STEP3-PS/1AC/24DC/4/PT to a 35 mm DIN rail or directly to the panel following the clearances in the datasheet. Connect L and N at the input push-in terminals and the output to the load; adjust the output voltage before connecting sensitive electronics. Keep the ventilation slots free and check for dust at regular intervals.

Check the table for the temperature derating and make sure the wiring uses the cross-sections stated for the push-in terminals. After commissioning, verify the output voltage under load and note the setting for future replacements.

Typical applications in Oman and the GCC

In Oman and the GCC, control cabinets often run at high ambient temperatures, so the operating range and derating curve in the table are what decide whether a supply is suitable. These supplies are used in oil and gas skids, water treatment and desalination plants, power substations, petrochemical packages and building automation panels.

Compact machine controls and building services panels in Oman and the GCC use 4 A supplies where heat build-up inside the board is a concern.

Comparison with related STEP POWER devices

Information to send with an RFQ

• Full part number STEP3-PS/1AC/24DC/4/PT and quantity.
• Mains supply voltage, phases and frequency at site.
• Total connected load and the largest single load current including inrush.
• Cabinet temperature at the hottest point and the mounting altitude.
• Whether redundancy, parallel operation or a monitoring signal is needed.
• Delivery location and required date.

Documents and quotation

Send us the part number STEP3-PS/1AC/24DC/4/PT and the quantity you need, and we will confirm which official documents are available for this device. Seven Star LLC is an independent supplier in Muscat and quotes for projects across Oman and the GCC; we do not act on behalf of the manufacturer.

Please also tell us the delivery location and required timeline so that availability can be checked before you commit to a project schedule.