Finder 78.36.1.230.2402 36 W Power Supply

Name: Finder 78.36.1.230.2402 36 W Power Supply – Datasheet
Brand: Finder
SKU: 78.36.1.230.2402

A 36 W, four-module supply with battery-charging capability

The Finder 78.36.1.230.2402 is a modular switch mode power supply that gives 24 V DC at up to 1.7 A (36 W rated) from a 110 to 240 V AC input. It is 70 mm wide, four modules, and 61 mm deep, so it sits in a standard distribution board next to modular devices. Finder quotes efficiency of up to 90% for the 78.36 and describes it as suitable for backup battery systems, with a battery-charge current limit of 1.9 A on the 24 V version.

The design uses a flyback topology with zero-voltage-switching quasi-resonant operation, short-circuit protection in hiccup mode, internal thermal protection and a varistor on the output. The output can be adjusted between 24 and 28 V with the front potentiometer, and a DC OK indicator is on the front panel.

Technical specifications

Parameter	Specification
Manufacturer / series	Finder, 78 series (36 W high efficiency, low profile)
Ordering code	78.36.1.230.2402
Output voltage	24 V DC, adjustable 24 to 28 V
Rated power	36 W
Output current (-20 to +40 C, 230 V AC)	1.7 A
Rated current IN (50 C, 100 to 265 V AC)	1.5 A
Maximum output current (battery charge limit)	1.9 A
Output power (-20 to +40 C)	40 W
Peak current capability for 3 ms	6 A
Voltage variation, no-load to full-load	Below 1%
Voltage ripple at full load	Below 200 mV
Hold-up at full load	Over 20 ms at 110 V AC; over 100 ms at 250 V AC
Nominal mains	110 to 240 V AC (50/60 Hz); 220 V DC, not polarised
Permitted operating window	100 to 260 V AC; 140 to 370 V DC
Maximum power consumption at 110 V AC	67 VA / 41 W
Stand-by consumption at 230 V AC	0.4 W or less
Power factor	0.62
Maximum current at 100 V AC	0.6 A
Inrush current (peak, 250 V AC, 3 ms)	10 A
Efficiency at 230 V AC	90%
MTTF	Above 600 000 hours
Start-up delay	Below 3 s
Insulation test, input to output	3000 V AC
Ambient temperature range	-20 to +70 C (see derating diagrams)
Protection category	IP 20
Standards listed	UL 61010, EN 61204-3; SELV system
Width x depth	70 mm (4 modules) x 61 mm
Connection / mounting	Box clamp terminals; 35 mm rail (EN 60715)

Battery backup and redundancy

The 78.36 can hold a small lead-acid or similar battery on float for backup of controllers and alarm circuits. The datasheet cross-references a page on battery-charge details and gives a maximum charging current of 1.9 A on the 24 V type, so calculate the battery capacity and charge time against that figure. Parallel working through OR diodes provides automatic redundancy, and dual polarity and series connection are permitted.

Load planning

Count the continuous current of the 24 V load against 1.7 A at normal temperature and 1.5 A at 50 C. The output can supply peaks of 6 A for 3 ms, which covers brief relay and valve switching but not sustained overloads. A start-up delay of up to 3 seconds means a controller on this rail starts a little after mains is applied. With an efficiency of 90% the dissipation stays low, which helps in sealed distribution boards.

Documents and quotation

The Finder 78 series datasheet is attached, with ordering information, derating diagrams and outline drawings for all types. To request a price for 78.36.1.230.2402, tell us the quantity, the mains supply, the 24 V load profile, whether a backup battery is involved and the cabinet temperature. Related supplies are listed under Power Modules.

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.

Frequently Asked Questions