Finder 78.W1.1.230.2402 24 V 120 W DIN Rail Power Supply

A 120 W single-phase supply with headroom for start-up peaks

The Finder 78.W1.1.230.2402 is an industrial single-phase switch mode power supply that provides 24 V DC at 5 A, a rated 120 W, from a 100 to 240 V AC input. It is one of two compact types in the same datasheet block as the 78.J1 (75 W); the W1 is 40 mm wide and takes its place on a 35 mm rail in standard control cabinets. Finder states efficiency of up to 92% for the family, and the table value for this type is 88% at 230 V AC.

The output tolerates short overloads: the datasheet lists a peak current capability of 6.5 A for 5 ms, a short-circuit peak of 30 A for 100 ms, and, depending on the version, a boost of up to 30% for 3 seconds. A short circuit is handled in hiccup mode with automatic recovery, and thermal protection shuts the unit down if it overheats.

Technical specifications

Sizing the 24 V rail

A 5 A rail suits a compact PLC panel with I/O modules, relay interfaces, sensors and a few solenoid valves. Sum the continuous current of all loads and leave margin, and use the peak and boost figures only for short inrush events such as valve or contactor coil pull-in, not for steady load. Two units can be connected in parallel for more current or for redundancy, but the datasheet specifies an external diode for that arrangement.

Input and mounting details

The input range of 90 to 264 V AC covers most single-phase networks, and a DC feed is accepted between 127 and 370 V DC with a drop-out level of 127 V. Inrush reaches 35 A peak at 230 V AC, so check the upstream breaker characteristic. The start-up delay of about 1.2 seconds at full load matters when the supply feeds a controller that must wait for other panel voltages. Keep the ventilation clearances shown in the derating diagrams, since the permitted output current falls with rising ambient temperature.

How the Finder 78.W1.1.230.2402 works

The 78.W1.1.230.2402 converts mains power into a smooth 24 V DC output. The input is rectified, switched at a high frequency through a small transformer, then rectified and filtered again. A control loop compares the output with a reference and adjusts the switching, so the voltage stays steady when the load changes. The output can be trimmed between 24 and 28 V. It can briefly supply more than rated current, which helps when a motor or a relay bank starts.

Where the Finder 78.W1.1.230.2402 is used

• PLC panels with I/O modules
• Relay interface cabinets
• Sensors and small solenoid valves
• Machine control boxes
• Building and process panels

Selection checklist for the Finder 78.W1.1.230.2402

• Total continuous load current at 24 V
• Peak load during start-up
• Input voltage range
• Ambient temperature and derating
• Width of 40 mm on the rail
• Output adjustment range
• Short-circuit behaviour
• Cabinet ventilation

Installation, commissioning and maintenance notes for the 78.W1.1.230.2402

Clip the supply onto the 35 mm rail with free space above and below. Wire the AC input through a breaker and tighten the box clamp terminals. Connect the 24 V output to the load rail. Switch on and check the output with a meter under load. Look at the terminals and the ventilation openings on a routine visit.

Requesting a quotation for the Finder 78.W1.1.230.2402

Please send the load current, the input supply and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

78.W1.1.230.2402 overload capability

The data sheet lists a peak current of 6.5 A for 5 ms and a short-circuit peak of 30 A for 100 ms.

78.W1.1.230.2402 input

The nominal input is 100 to 240 V AC at 50 or 60 Hz, or 140 to 338 V DC. The operating range is 90 to 264 V AC.

78.W1.1.230.2402 efficiency and hold-up

Efficiency is 88 percent at 230 V AC. Hold-up time is 10 ms at 115 V AC and 16 ms at 230 V AC.

78.W1.1.230.2402 size and temperature

The body is 40 mm wide and 126.4 mm high. The ambient range is minus 20 to plus 70 degrees C with derating.

Supply records for the 78.W1.1.230.2402

Write the ordering code and the load total on the panel drawing.

Choosing the right 78.W1.1.230.2402 rating

Choose a rating with margin above the sum of the continuous loads.

78.W1.1.230.2402 inrush and start-up

Inrush current peaks at 35 A at 230 V AC, and start-up takes 1200 ms at full load, so size the upstream breaker with this in mind.

78.W1.1.230.2402 insulation

Dielectric strength is 3000 V AC between input and output and 2000 V AC between input and earth.

78.W1.1.230.2402 mounting and terminals

The supply uses box clamp terminals and mounts on a 35 mm rail to EN 60715, with a body depth of 119.1 mm.

Documents and quotation

The attached Finder datasheet covers the whole 78 series, including the 78.J1, 78.X1 and 78.Y1 siblings, with outline drawings, derating diagrams and ordering information. For a quotation on 78.W1.1.230.2402, send the quantity, the supply voltage and frequency, the 24 V load profile and the cabinet temperature. Related supplies are listed under Power Modules.