Siemens 6EP1332-5BA20 SITOP PSU100C 24V/3.7A Power Supply

6EP1332-5BA20: SITOP PSU100C 24 V / 3.7 A stabilized power supply, explained

The Siemens 6EP1332-5BA20 is a slim single-phase DIN-rail power supply from the SITOP compact line, built for the lower power range where cabinet space is tight. It is the 24 V DC, 3.7 A version in the catalog. This 3.7 A model is the PSU100C variant for NEC Class 2 circuits: its output power is limited to 100 VA, and in the catalog it is the one version aimed at that use. It is 52.5 mm wide, weighs about 0.32 kg and, unlike the 4 A device, has no output-voltage potentiometer.

The article number is simply the catalog identifier for this rating of the SITOP PSU100C group; it does not describe the build in a way that can be decoded digit by digit without the manufacturer’s tables, so always quote the full number 6EP1332-5BA20 when ordering. Seven Star LLC supplies the 6EP1332-5BA20 in Oman and the GCC as an independent supplier in Muscat.

Technical specifications of the 6EP1332-5BA20

Values are taken from the manufacturer’s SITOP catalog (KT 10.1, 2016) and the PSU100C operating instructions and apply at rated input voltage and +25 °C unless stated otherwise; check the current data sheet of the exact unit before design freeze.

How the 6EP1332-5BA20 regulates and protects its 24 V output

The 6EP1332-5BA20 is a primary-clocked (switch-mode) converter: the incoming AC or DC is rectified, chopped at high frequency, passed through an isolating transformer and rectified again, and a PWM controller holds the 24 V output against changes in mains and load. The output is electrically isolated from the input, no-load proof and short-circuit proof, and a green LED lights while the output voltage is present.

Because the input is wide-range, the same unit works on 85 – 264 V AC or 110 – 300 V DC without any switch or jumper. That is convenient for panels built once and shipped to sites with different mains standards, and it also allows the unit to be fed from a DC bus when one exists.

Where the 6EP1332-5BA20 fits in the control system

In a typical cabinet the 6EP1332-5BA20 sits right behind the incoming breaker and feeds a 24 V distribution rail. Other members of the SITOP PSU100C group in the catalog are 6EP1321-5BA00, 6EP1322-5BA10, 6EP1331-5BA00, 6EP1331-5BA10, 6EP1332-5BA00, 6EP1332-5BA10; they share the same operating concept but differ in rated current, width and weight, so they are not interchangeable in a fixed layout without checking space and breaker coordination.

For this series the catalog lists the SITOP PSE202U redundancy modules (6EP1962-2BA00 for NEC Class 2 output power, 6EP1964-2BA00 for up to 10 A), the SITOP PSE200U 3 A four-channel selectivity module (6EP1961-2BA11 with common alarm, 6EP1961-2BA31 with single-channel signalling) and removable spring-type terminals under 6EP1971-5BA00.

As an independent supplier, Seven Star LLC can help you match the supply to the rest of the bill of materials, for example by checking that the redundancy or buffer module suits the output current, but the final electrical design remains with your engineering team.

Selection and ordering checklist for the 6EP1332-5BA20

• Load current: add the continuous demand of all 24 V consumers and compare it with the 3.7 A rating of the 6EP1332-5BA20, leaving margin for inrush and future additions.
• Mains: confirm that the site supply matches the input data (Wide range: 85 – 264 V AC or 110 – 300 V DC (rated 100 – 230 V)) and check the input current figures given in the specification table.
• Cabinet temperature: the operating range is -20 – +70 °C and derating applies at the upper end; compare it with the worst-case temperature inside the enclosure.
• Space: allow 52.5 mm width on the rail plus 80 mm of height and 100 mm of depth; vertical clearance for convection is required.
• Protection: the catalog recommends a miniature circuit breaker of 16 A characteristic B or 10 A characteristic C on the input; the built-in fuse is internal.
• Add-ons: decide early whether a redundancy, buffer or selectivity module is needed; the catalog lists compatible modules for the series.
• Choose it when the installation standard requires a Class 2 limited-power source; if you need a trimmable output or a full 4 A, the 6EP1332-5BA10 is the alternative in the same series.

Installation, commissioning and maintenance

Mount the 6EP1332-5BA20 on a 35 mm DIN rail (EN 60715) in a closed cabinet, vertically, with the input terminals at the bottom and the output terminals at the top. The operating instructions require at least 50 mm of free space above and below, reduced to 25 mm only next to cable ducts; no lateral clearance is needed.

The input and output use pluggable screw terminals. Because the unit is a built-in device, it must be installed where only qualified personnel have access, and for use in a hazardous zone the instructions call for an enclosure with at least IP54. After wiring, switch on and confirm the green OK lamp and the output voltage with a meter; if a trim is allowed, use an insulated screwdriver on the potentiometer and derate the output current by 4 % per volt when raising the output above its nominal value.

Because the output voltage is fixed, there is no trimming step: confirm the mains, confirm 24 V at the terminals and check the green lamp.

• Inspect terminals for tightness and discolouration at each shutdown.
• Clean dust from the vents with dry compressed air; do not block the convection path.
• Compare the output voltage with the value recorded at commissioning.
• Keep one spare of the same article number for critical cabinets, since lead times for individual SITOP models can vary.

Typical applications in Oman and the GCC

In Oman and the GCC, slim supplies like the 6EP1332-5BA20 are used where cabinet space is limited and temperatures are high: small control boxes at remote wellheads, instrument junction boxes in processing plants, desalination skids and utility buildings. The wide AC/DC input is useful on sites that mix mains and DC bus supplies. Dust, humidity and sun-heated enclosures should be considered when choosing the cabinet size and clearances.

It is used for limited-power control circuits, UL-driven machine panels and installations that must meet Class 2 wiring rules.

SITOP PSU100C group at a glance

The table lists the SITOP PSU100C versions found in the catalog so you can compare ratings and size before selecting the 6EP1332-5BA20.

Information to send with an RFQ for the 6EP1332-5BA20

• Exact article number (6EP1332-5BA20) and quantity, including whether you need identical replacement or an equivalent.
• Supply system at site: voltage, frequency and number of phases, plus whether a DC feed is possible.
• Output requirement: voltage, continuous current, peak or inrush loads and the number of parallel units if redundancy is planned.
• Ambient conditions inside the cabinet: maximum temperature, dust, humidity and any hazardous-area classification.
• Required accessories, for example redundancy, buffer or selectivity modules, terminals or labeling plates.
• Delivery location (Muscat or elsewhere in Oman or the GCC) and required delivery time.
• Any document requirement such as a datasheet or manual in English.

Documents and quotation

A datasheet or manual for this series is attached on this page; it is the manufacturer’s document and the figures in it take precedence over the summary above.

Seven Star LLC is an independent supplier based in Muscat and is not affiliated with the manufacturer. To request a quotation for the 6EP1332-5BA20, send the information listed above through the request-for-quotation form or by email; we will reply with availability and lead time.