A DIN rail power supply is a switched-mode power supply (SMPS) housed in a compact metal or plastic enclosure designed to snap onto a standard DIN rail inside an electrical cabinet. It converts AC mains (e.g. 100–240 VAC or 380 VAC) into a stable, low-voltage DC output (commonly 24 VDC, 12 VDC or 48 VDC) used to power PLCs, sensors, contactors, relays and industrial control systems.

The most common industrial standard is 24 VDC, suitable for the vast majority of PLC, sensor and automation applications. Choose based on your load's rated voltage:

• 24 VDC — industrial automation (default choice)
• 12 VDC — LED, CCTV, small electronics
• 48 VDC — telecom, POE, longer-distance systems
• 5 VDC — logic / microcontroller circuits

Use the formula: Power (W) = Voltage (V) × Current (A), then add a safety margin.

• Add up the total wattage of all loads connected to the supply.
• For current: A = W ÷ V.
• We recommend a 20–30% reserve to handle inrush currents and future expansion.

Example: A 24 V system with loads totaling 8 A → 24 × 8 = 192 W. Choose a 240 W (10 A) unit for a comfortable margin.

Efficiency is the ratio of output power to input power, expressed as a percentage. A higher efficiency means less energy lost as heat. SANMU POWER DIN rail supplies typically achieve 88% – 95% efficiency.

• Higher efficiency → lower electricity cost & less heat generation.
• Less heat → longer lifespan & reduced cooling requirements.
• Look for units that comply with ERP / CoC Tier 2 or equivalent energy standards.

A quality DIN rail power supply should include the following built-in protections:

• Short Circuit Protection (SCP / OCP) — auto-recovery or latch-off on fault.
• Overvoltage Protection (OVP) — prevents damaging voltage spikes.
• Overload / Overcurrent Protection (OLP).
• Over Temperature Protection (OTP).
• Surge / inrush current limiting.

DIN rail power supplies are widely used in: industrial automation & control panels, PLC & DCS systems, factory machinery, building automation (BMS / HVAC), LED lighting, CCTV & security, telecom cabinets, renewable energy & battery backup systems, and railway / transportation signaling.

Slide the top edge of the unit onto the DIN rail, then press the bottom inward until it clicks / latches into place. To remove, use a screwdriver to pull down the release clip at the base. No screws or drilling are required, making field replacement quick.

Most industrial units are designed for the standard 35 mm DIN rail (TS-35 / EN 60715), specifically the top-hat profile (TH35). Some smaller models also support 32 mm rails. Always check the datasheet for exact compatibility.

Standard units typically operate from -10 °C to +50 / +60 °C. For harsh environments, wide-temperature models cover -40 °C to +70 °C or higher. Note that many supplies derate output power above ~50 °C — check the derating curve in the datasheet.

Yes, but follow proper separation practices: keep AC input and DC output wiring in separate cable trays / conduits where possible, use correctly rated breakers and fusing, and respect all local electrical codes. Always disconnect power before wiring.

We recommend an appropriately sized input circuit breaker / fuse on the AC side and, for sensitive loads, a DC fuse or breaker on the output side. This protects both the supply and downstream equipment during faults.

Yes. We offer flexible OEM/ODM customization including output voltage (5 V / 12 V / 24 V / 48 V or adjustable ranges), output power, connector types, enclosure size, and electrical parameters. Share your specification and we will propose a tailored solution.

Absolutely. We support private labeling: your company logo can be printed on the unit label, laser-etched or placed via a nameplate, and reproduced on the box, manual and outer carton — delivering a complete branded product.

MOQ depends on the model and level of customization:

• Standard models: low MOQ, often from 50–100 pcs.
• Customized (OEM/ODM) models: typically 500 pcs, negotiable based on project.

Yes, samples are available for evaluation. Sample costs and shipping are usually paid by the customer and may be credited against a subsequent bulk order. Lead time for samples is generally 3–7 days for standard units.

Yes — we supply datasheets, dimension drawings, wiring diagrams, and support certification needs such as CE, RoHS, REACH, UL/cUL where applicable. Let us know your target market's compliance requirements.

• Standard models (in stock): 7–15 days after payment confirmation.
• Custom / OEM orders: typically 25–35 days, depending on complexity and quantity.

Exact lead time will be confirmed on the proforma invoice / purchase order.

We commonly accept T/T (wire transfer / bank transfer), with terms such as 30% deposit and 70% balance before shipment. For established partners, other arrangements (L/C, PayPal for samples, etc.) may be available. All terms are confirmed on the invoice.

We ship worldwide via sea freight, air freight or express courier (DHL, FedEx, UPS) depending on urgency, weight and budget. Shipping terms (EXW, FOB, CIF, DDP, etc.) and Incoterms are agreed upon before ordering.

Standard packaging: individual unit in a protective bag / box, packed into an outer carton with foam / divider for safe transport. For OEM orders, we follow your custom packaging and branding specifications (box design, manual, labels, barcodes).

SANMU POWER products come with a standard 2-year warranty (some series up to 3–5 years), covering manufacturing defects under normal use. Extended warranty options may be available for large / OEM projects.

Our technical support team assists with model selection, installation guidance, troubleshooting and replacement of defective units. We provide responsive support via email / phone / video call and work to resolve issues promptly to keep your project on track.