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DC Switching Power Supply – COSEL LDC15F-2
The LDC15F-2 is a DC switching power supply (“DC Switching Power Supply”) manufactured by COSEL, belonging to the LDC series of compact low-power industrial converters. Documented as a logic supply component in CNC control systems and industrial panels, it delivers a regulated DC output voltage — in the F2 variant typically +12 V DC — with a nominal output power of approximately 15 W. The unit accepts wide-range universal AC input and includes built-in overload and short-circuit protection.
The LDC15F-2 power supply provides stable, filtered logic supply voltages to the machine’s CNC control circuits: CPU boards, I/O modules, encoders, and communication interfaces all depend on clean, stable voltage to operate correctly. A failure or excessive ripple causes random CNC errors, parameter loss, unexpected shutdowns, or irreversible damage to control boards.
COSEL Co., Ltd. is a Japanese manufacturer founded in 1969, headquartered in Toyama, specialising in high-reliability switching power supplies for industrial, medical, and CNC applications. COSEL products are globally recognised for their long operational life and low electromagnetic interference. Some legacy series such as the LDC are legacy / discontinued: available primarily as NOS (new old stock), used, or through specialist repair.
Main Technical Specifications
| Type | DC switching power supply (DC Switching Power Supply) |
| Part number | LDC15F-2 (LDC15F2) |
| Brand | COSEL Co., Ltd. |
| Known application | CNC control systems, industrial panels, industrial automation equipment |
| Function | Regulated and filtered DC logic supply for control circuits |
| Output power | ~15 W (nominal) |
| Input voltage | 85–264 V AC, 47–440 Hz |
| Output voltage | +12 V DC |
| Output current | ~1.25 A max |
| Protection | Overcurrent, short-circuit (typical for series) |
| Interfaces / connectors | Screw terminal block; DIN rail or panel mount |
| Weight | ~0.2–0.5 kg |
| Dimensions | ~80–130 × 50–80 mm |
| Production status | Legacy / discontinued — NOS/used/repair only |
DIN Rail Switching Power Supply 75 W / 18 V – COSEL LDA75F-18
The LDA75F-18 is an industrial DIN rail switching power supply (“DIN Rail Switching Power Supply”) manufactured by COSEL, belonging to the LDA75F series rated at 75 W. The unit accepts universal AC (85–264 V AC, 47–63 Hz) or DC (120–370 V DC) input and delivers a regulated 18 V DC output at a nominal maximum current of approximately 4.2 A. Cooling is achieved by natural convection, with no fan required. Isolation is reinforced type in compliance with major international standards (UL, CE). No official hardware revisions have been publicly documented.
The switching power supply converts mains AC voltage into a stable, regulated DC voltage, essential for powering CNC control logic boards, I/O modules, sensors, transducers and all low-voltage devices on the machine tool. A power supply failure causes an immediate loss of auxiliary power: the CNC triggers an alarm, drives may lose their enable logic voltage, and the machine stops in an uncontrolled manner, risking workpiece loss and tool damage.
COSEL Co., Ltd. is a Japanese manufacturer founded in 1969, specialised in the design and production of high-reliability AC/DC switching power supplies for industrial, medical and telecommunications applications. The LDA series is the compact DIN rail range of reference for industrial control panels, renowned for low output ripple, high efficiency and long operating life. The LDA75F-18 model is legacy / discontinued: available exclusively as NOS stock, used units, or through specialist distributors.
Main Technical Specifications
| Type | Industrial switching power supply, DIN rail 35 mm mount |
| Part number | LDA75F-18 (LDA75F18) |
| Brand | COSEL Co., Ltd. (Japan) |
| Known application | CNC control panels and industrial machine tools (general purpose) |
| Function | AC/DC mains conversion → regulated 18 V DC for control circuits, logic and I/O |
| Input voltage | 85–264 V AC (47–63 Hz) / 120–370 V DC (universal) |
| Output voltage | 18 V DC regulated |
| Max output current | ~4.2 A |
| Output power | 75 W |
| Isolation | Reinforced (EN 62368-1, UL 62368-1) – LDA series typical |
| Cooling | Natural convection (fanless) |
| Operating temperature | −10 °C to +60 °C |
| Interfaces / connectors | Screw terminal block for AC input and DC output; DIN rail 35 mm mounting clip |
| Weight | ~0.7–1.1 kg |
| Dimensions | ~45 × 125 × 113 mm W×H×D |
| Production status | Legacy / discontinued — NOS/used/surplus only |
150W 12V DC Switching Power Supply – COSEL LDA150W-12
The LDA150W-12 is a single-output 12 V DC / 12.5 A industrial switching power supply (“Switching Power Supply”) manufactured by COSEL, belonging to the LDA150W series. The part number encodes the nominal output power of 150 W and the regulated output voltage of 12 V DC. The input is universal AC (85–264 V AC, 47–63 Hz), compatible with both 110 V and 230 V mains without manual range switching. The unit is designed for panel or DIN-rail mounting inside electrical cabinets and is widely used as an auxiliary power supply in CNC control systems from various manufacturers (Fanuc, Mitsubishi Electric, Mazak, Okuma, and others). The alternative commercial part number is listed exclusively in the technical table below.
The auxiliary power supply converts mains voltage into stable DC voltage, which is essential to power the CNC’s control logic, I/O modules, encoders, position sensors, operator panel, and safety circuits. A failure or output voltage drift produces erratic machine behaviour or shutdowns that are particularly difficult to diagnose, since symptoms typically appear intermittently — position errors, unexpected resets, random alarms — before the unit fails completely.
COSEL Co., Ltd. is a Japanese switching power supply manufacturer founded in 1969 and headquartered in Toyama, Japan, specialised in high-reliability power solutions for industrial, medical, and telecommunications applications. COSEL products are internationally recognised for their high build quality, long service life, and compliance with major international certifications (UL, CE, TÜV). The company remains active and independent; however, certain older revisions or series may be legacy / discontinued — it is advisable to verify availability of the specific part number with an authorised distributor before ordering.
Main Technical Specifications
| Type | Single-output industrial DC switching power supply (Switching Power Supply) |
| Part number | LDA150W-12 (LDA150W12) |
| Brand | COSEL Co., Ltd. (Japan) |
| Known application | Auxiliary power supply in industrial CNC cabinets (Fanuc, Mitsubishi, Mazak, Okuma, and other systems) |
| Function | AC/DC conversion, stable 12 V DC auxiliary voltage for control logic, I/O modules, encoders, and sensors |
| Input voltage | 85–264 V AC, 47–63 Hz (universal input, no manual range switching) |
| Output voltage | 12 V DC (on-board trimmer adjustable ±10 %) |
| Maximum output current | 12.5 A |
| Rated output power | 150 W |
| Typical efficiency | ~85–88 % |
| Operating temperature | -10 °C to +70 °C (linear derating above +50 °C) |
| Interfaces / Connectors | Screw terminals for AC input and DC output; on-board output voltage adjustment trimmer |
| Certifications | UL, CE, TÜV (typical for COSEL industrial series) |
| Weight | ~0.6–1.0 kg |
| Dimensions | ~199×98×38 mm |
| Production status | Check availability — certain revisions may be legacy / discontinued |