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Brand: Finder
Finder 78.12.1.230.2400 24 V 12 W DIN Rail Power Supply
Description
A one-module 24 V supply for small control circuits
The Finder 78.12.1.230.2400 is a 12 W modular power supply that turns a 110 to 240 V AC or 220 V DC input into 24 V DC at 0.63 A. Finder builds it in a housing only 17.5 mm wide (one module) and 61 mm deep, so it fits on a 35 mm rail beside relays, timers and contactors in a distribution board. The datasheet describes it as a general-use supply for 24 V loads, designed for SELV systems.
Typical efficiency is 85% at 230 V AC and stand-by consumption is below 0.4 W. The output carries a hiccup short-circuit protection that recovers automatically, an internal thermal protection that shuts the output down until the unit is powered off and on again, and a varistor on the output for overvoltage.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / series | Finder, 78 series (switch mode power supplies) |
| Ordering code | 78.12.1.230.2400 |
| Output voltage | 24 V DC |
| Rated power | 12 W |
| Output current (-20 to +40 C, 230 V AC) | 0.63 A |
| Rated current IN (50 C, full input range) | 0.50 A |
| Output power (-20 to +40 C, 230 V AC) | 15 W |
| Peak current capability for 3 ms | 2 A |
| Voltage variation, no-load to full-load | Below 1% |
| Voltage ripple at full load | Below 200 mV |
| Hold-up time at full load | Above 10 ms at 100 V AC; above 90 ms at 260 V AC |
| Nominal input | 110 to 240 V AC (50/60 Hz); 220 V DC, not polarised |
| Operating range | 100 to 265 V AC (88 to 100 V AC with output current limited to 80% of IN); 140 to 370 V DC |
| Maximum power consumption at 110 V AC | 28.2 VA / 14.2 W |
| Stand-by consumption at 230 V AC | Below 0.4 W |
| Power factor | 0.50 |
| Maximum current at 88 V AC | 0.25 A |
| Inrush current (peak, 265 V AC, 3 ms) | 10 A |
| Efficiency at 230 V AC | 85% |
| MTTF | Above 400 000 hours |
| Start-up delay | Below 1 s |
| Dielectric strength, input to output | 3000 V AC |
| Ambient temperature range | -20 to +60 C (see derating diagrams) |
| Protection category | IP 20 |
| Short-circuit protection | Hiccup mode, automatic recovery |
| Standards listed | EN 60950-1, EN 61204-3 |
| Width x depth | 17.5 mm (1 module) x 61 mm |
| Connection / mounting | Box clamp terminals; 35 mm rail (EN 60715) |
Using a 12 W supply well
Twelve watts is enough for a handful of 24 V relay coils, a few sensors or a compact controller, but not for a whole panel. Add up the continuous current of every load against 0.63 A at normal temperature, and use the 0.50 A rating when the cabinet runs near 50 C. If the available line voltage can drop between 88 and 100 V AC, the datasheet limits the output current to 80% of the rated value there.
The datasheet notes that dual polarity and series connection are permissible, and that parallel working with OR diodes gives automatic redundancy. Remember that the 24 V side is SELV: keep it separated from mains wiring in the enclosure.
Installation notes
Snap the module onto the rail, wire the input and output through the box clamps, and leave the free air around the housing that the derating diagrams assume. Because the unit is a flyback design with a 3000 V AC input-to-output rating, it needs no external heat sink. Where a longer hold-up is useful, the datasheet figures of above 90 ms at 260 V AC give ride-through for brief mains dips on the supply side.
Documents and quotation
The attached Finder datasheet covers the full 78 series with outline drawings, ordering information, derating diagrams and approvals. For a quotation on 78.12.1.230.2400, send the quantity, the supply voltage and frequency, the 24 V load current and the cabinet temperature. Related supplies are listed under Power Modules.
Datasheets & Documents
- Datasheet Finder 78 series datasheet (EN) Download
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About brand
Finder is an Italian manufacturer of relays, timers, power supplies and other electromechanical and electronic devices, founded in 1954 and headquartered in Almese, in the Susa Valley of Piedmont. Seven Star LLC, an independent supplier in Muscat, lists Finder modular contactors, safety relays and DIN rail power supplies for control panels, building services and machine automation.
Relay, contactor and power supply families
The range runs from step relays and modular contactors to safety relays with forcibly guided contacts and switch mode power supplies for 35 mm rail. Each series has a datasheet with ordering codes, coil data, contact ratings, derating curves and approvals, so a part can be specified or replaced by its full type code rather than by series name alone.
Ordering Finder products: what we need
Quote the complete ordering code, including coil voltage and contact variant, together with the quantity, the supply voltage and frequency of the installation and any approvals the project requires. With that information the matching Finder version can be confirmed against the datasheet before a quotation is issued.
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Frequently Asked Questions
What output does the 78.12.1.230.2400 provide?
It gives 24 V DC, 12 W, with 0.63 A available from -20 to +40 C at 230 V AC input.
What input voltage does it accept?
Nominal 110 to 240 V AC (100 to 265 V AC operating) or 220 V DC (140 to 370 V DC).
How wide is the housing?
It is one module wide, 17.5 mm, and 61 mm deep, mounted on a 35 mm rail.
How is the output protected?
Hiccup short-circuit protection with automatic recovery, internal thermal shutdown and a varistor for overvoltage.
Can two units be used for redundancy?
Yes. The datasheet notes parallel working with OR diodes for automatic redundancy.
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