RG125-19/12 N ebm-papst 12V DC Compact Blower

RG125-19/12 N ebm-papst: Compact High-Velocity Cooling

The RG125-19/12 N is a compact centrifugal blower designed for 12V DC applications where space is at a premium but high airflow velocity is required. With a housing size based around a 125mm impeller geometry, this unit fits perfectly in 1U or 2U server racks, medical devices, and automotive electronics cooling. The housing is made of fiberglass-reinforced plastic (PBT), providing a rigid and thermally stable structure. The brushless DC motor ensures spark-free operation and high efficiency, drawing power from standard 12 VDC buses commonly found in computer and telecom hardware.

Detailed Technical Specifications

• Impeller Size: 125 mm equivalent.
• Nominal Voltage: 12 VDC (Range 8 – 14 VDC).
• Motor: Brushless DC motor.
• Airflow Direction: Axial intake, centrifugal exhaust (90°).
• Connection: Wire leads (AWG 22).
• Protection: Electronic locked-rotor protection.

Engineer’s Field Notes

Lifecycle State: Active. Diagnosis: A common issue in 12V systems is voltage drop. Ensure the voltage at the fan terminals is at least 11V; below this, the internal electronics may not trigger the start sequence properly. Noise increases towards the end of bearing life (ball bearings); replacement is the only option as they are sealed. Installation Tips: The mounting holes are designed for standard M4 screws. Do not over-torque, as this can deform the PBT housing and cause impeller rub. Compatibility: Perfectly suited for motherboard headers or Siemens LOGO! 12/24 modules. The tachometer output (white wire usually) allows for fan failure alarms to be programmed into the BMS or local monitoring system.

Why choose RG series?

The scroll housing design of the RG125 allows it to push air through restrictive ducts or filters much more effectively than an open axial fan of the same size.

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