Runda RS5020B12VH-A — 12V 0.22A 50×50×20mm 2-Wire DC Cooling Fan

Runda · RS Series · DC Axial Cooling Fan · In stock

The Runda RS5020B12VH-A is a 50×50×20 mm (5×5×2 cm) DC axial cooling fan from Runda, one of the most widely adopted value-tier cooling fan brands used in 3D printers, small electronics enclosures, and control cabinets. It runs on 12 V DC at 0.22 A (approximately 2.6 W of input power) and is supplied as a 2-wire build — power and ground only, with no tachometer or PWM signal pin. This makes the RS5020B12VH-A an ideal drop-in replacement for failed stock fans in cost-sensitive OEM builds, and a popular line item for MRO buyers restocking 50mm cooling fans across an entire panel shop.

KOEED supplies the RS5020B12VH-A alongside the broader DC cooling fan catalog as part of our nine-brand industrial automation sourcing matrix. Runda fans pair well with Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic, and KEYENCE enclosures — any cabinet or sub-panel that already runs 12 V DC on a back-plane can swap a failed fan in under a minute. Send your project BOM to Moritta@KOEED.COM for unit, pack, and bulk pricing within 24 hours.

Key Specifications

Datasheet Highlights

• 50×50×20 mm (5020) standard frame — the most common "5 cm" case fan footprint used in 3D printer electronics bays, small UPS units, and control cabinets. Four corner M3 mounting holes on a 40 mm pitch match the de-facto industry standard.
• 12 V DC, 0.22 A (B12VH-A suffix) — the "B12" indicates the 12 V variant, and the trailing "VH-A" denotes the high-speed sleeve-bearing option used in most cost-sensitive OEM builds. Power draw of roughly 2.6 W is comfortable for a single USB-PD or ATX 12 V rail.
• 2-wire harness (no tach, no PWM) — one red V+ lead and one black GND lead. This is the simplest configuration: the fan runs at full speed whenever 12 V is applied. There is no rotation-speed feedback to the host controller, so it is not suitable for predictive-maintenance loops that read RPM.
• Forward-curved 7-blade impeller — the RS5020 series uses a 7-blade rotor optimized for steady airflow at moderate static pressure, well matched to densely-packed 3D printer control boards and cabinet filter-grille combinations.
• Insulation & housing — rotor and stator assemblies are impedance-protected. The fan housing is reinforced thermoplastic (PBT, UL94V-0 class on the standard SKU). Refer to the manufacturer datasheet for full agency certifications.

Typical Applications

• 3D printer board & hot-end cooling — the most common home for the 5020 form factor. A single RS5020B12VH-A clears heat from a stepper-driver MOSFET bank or a hot-end heatsink on Ender, Prusa, Voron, and CR-series printers on 12 V (or 24 V with a buck converter). See our cooling fan guide for a 4010 vs 4020 vs 5020 vs 6030 comparison.
• DIN-rail enclosure & control cabinet spot cooling — when a sealed cabinet sits in a warm plant room, a single 50 mm exhaust fan on the top panel is often the cheapest thermal fix. Pair with a filter grille and a thermostat for auto-trigger.
• Small electronics, router & NAS chassis — a direct replacement for failed stock fans in mini-ITX cases, network switches, and hobby electronics that have worn out their original sleeve-bearing fans.
• MRO replacement of failed cabinet fans — for maintenance engineers running Allen-Bradley, Siemens, or Schneider panels, the RS5020B12VH-A is a known-good substitute for EOL legacy 50 mm fans no longer stocked by the original enclosure vendor.
• 3D printer OEM production runs — 3D printer builders routinely spec 5020 fans by the thousand. The 2-wire build keeps the BOM simple and the 12 V rating lines up with the rest of the printer's power tree.
• Educational & maker electronics — the low cost and universal 50 mm form factor make this fan a default pick for lab kits, robotics projects, and student-built automation cells.

Related Modules & Cross-Reference

Warranty & Authenticity

• Tested before shipment — every RS5020B12VH-A is visually inspected and run-tested (current draw & rotation check) at our China Sourcing Company intake before it goes into the pick bin.
• Original Runda manufacture — sourced through Runda's authorized distribution channels. No aftermarket relabeling. The label on each fan shows the Runda logo, the RS5020B12VH-A part string, the rated voltage & current, and the date code.
• Worldwide shipping — shipped from our Shenzhen / Hong Kong dual-base operation via DHL, FedEx, UPS, or your nominated forwarder. Tracking is shared the same business day the unit leaves the warehouse.
• Quote within 24 hours — send a single-line RFQ or a multi-line BOM and we will reply with unit price, pack price, lead time, and shipping options inside one business day. For larger orders, include target price and we will work back from there.
• Cross-reference support — if you are migrating from a Sunon, Delta, AVC, Orion, or Noctua 50 mm fan to a Runda equivalent, send the old P/N to Moritta@KOEED.COM and we will confirm electrical and mechanical compatibility.