Product Core Brief

• Model: LWN2660-6
• Brand: ABB
• Series: LWN DIN-rail power supply family
• Core Function: Converts universal AC input to regulated 24 VDC for PLCs, sensors, relays, and control circuits.
• Product Type: DIN-Rail AC-DC Switching Power Supply
• Key Specs: 85–264 VAC input | 24 VDC, 10 A, 240 W output | Overload, short-circuit, overvoltage protection
• Condition: New Original / New Surplus

Key Technical Specifications

• Input voltage range: 85–264 VAC
• Output voltage: 24 VDC
• Output current: 10 A
• Output power: 240 W
• Efficiency: Typical 92%
• Protection functions: Overload (constant current limit), short-circuit (auto recovery), overvoltage
• Mounting: DIN rail TS35/7.5 or TS35/15
• Operating temperature: -25 °C to +70 °C (with derating)
• Storage temperature: -40 °C to +85 °C
• Enclosure rating: IP20 typical for DIN-rail power supplies
• Typical applications: PLC systems, instrumentation, relay panels, sensors, actuators, control cabinets

 

Product Introduction (No Fluff)

The ABB LWN2660-6 is a DIN-rail mounted AC-DC switching power supply that delivers 24 VDC at up to 10 A. It is commonly used to power control cabinets, PLC racks, field instruments, relays, and auxiliary automation devices.

Its wide 85–264 VAC input range allows use across multiple regions without separate transformer taps. With overload, short-circuit, and overvoltage protection, it provides a practical replacement option for maintenance teams keeping spare power capacity on hand. Always verify the nameplate rating before installation, especially when substituting for other 24 VDC supplies.

 

QA & Testing SOP (Dynamic & Transparent)

Power supplies should never be cleared for shipment based on appearance alone. Here is how we verify this unit:

1. Inbound authenticity check: Confirm ABB branding, model LWN2660-6, serial/lot markings, terminal block condition, and housing integrity. Units with reworked labels or burnt connectors are rejected.
2. Visual and mechanical inspection: Check DIN-rail latch, screw terminals, ventilation slots, PCB mounting, and signs of overheating or moisture ingress.
3. No-load power-up test: Apply rated AC input and confirm stable 24 VDC output, correct LED indication, and normal fan or convection behavior if applicable.
4. Load-bank verification: Use an electronic load or resistive load bank to confirm voltage regulation at partial and full load, checking for excessive droop or instability.
5. Ripple and protection check: Measure output ripple with an oscilloscope where possible, and verify overload/short-circuit response before repacking.

All units are shipped in anti-static, moisture-controlled packaging with terminal protection.

 

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Do not exceed the 240 W / 10 A output rating. If the control cabinet already runs close to 240 W, adding more sensors, relays, or PLC modules can cause thermal derating or repeated shutdowns.

❗ Check input voltage before energizing. The LWN2660-6 supports 85–264 VAC, but the upstream breaker, fuse, and wiring must still match local electrical standards. A wrong fuse rating can create a safety hazard even if the supply itself survives.

❗ Ensure proper DIN-rail seating and grounding. A loose rail clip or missing protective earth connection can cause intermittent faults, noise on the 24 VDC bus, or safety issues.

❗ Watch for parallel operation issues. Do not parallel this supply with another 24 VDC power source unless the documentation explicitly supports it. Unmatched outputs can cause circulating current and premature failure.

Replacement steps:

1. Pre-install: Confirm input voltage, load current, wiring size, fuse rating, and available DIN-rail space.
2. Removal: Isolate AC power, verify zero voltage, label wires, and disconnect load and input terminals.
3. Install: Snap the unit onto TS35 DIN rail, connect protective earth, then wire AC input and 24 VDC output.
4. Power-on test: Measure output voltage, confirm LED status, check load stability, and verify protection behavior under fault conditions.

Technical FAQ

1. Can the LWN2660-6 replace other 24 VDC DIN-rail supplies?
Often yes, if the replacement has equal or higher current capacity, compatible dimensions, and suitable protection features. A 240 W / 10 A unit should not replace a higher-rated supply without recalculating the cabinet load.

2. Is it suitable for PLC and sensor power?
Yes. It is commonly used for PLC racks, HMI backlights, relays, proximity sensors, solenoid valves, and other 24 VDC control loads. For safety circuits, confirm that the power architecture meets the required safety standard.

3. Does it support universal input voltage?
Yes. The 85–264 VAC range allows operation on most global AC supplies. Still verify local wiring codes, fuse requirements, and upstream protection.

4. What is the warranty on surplus stock?
Warranty depends on condition and supplier policy. New original units typically carry a standard warranty, while surplus inventory may carry a shorter coverage period. Confirm before ordering.

5. Is this model still supported?
The LWN2660-6 has been widely used in industrial control cabinets, but current lifecycle status should be confirmed against the latest ABB documentation. For new system designs, verify whether a newer series is recommended.