CBM-5512B-050-346-22

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**date** 08/27/2025 **page** 1 of 6 

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## **SERIES:** CBM-55B | **DESCRIPTION:** DC BLOWER 

## **FEATURES** 

- dual ball bearing 

- 55 x 55 mm frame 

- multiple speed options 

- PWM/tachometer wires available 

|**MODEL**|**voltage**|**input**<br>**voltage**|**input**<br>**current1**|**input**<br>**current1**||**input**<br>**power1**||**rated**<br>**speed1**|**airflow2**|**static**<br>**pressure3**|**noise4**|
|---|---|---|---|---|---|---|---|---|---|---|---|
||**rated**|**range**|**typ**|**max**|**typ**||**max**|**typ**|||**typ**|
||(Vdc)|(Vdc)|(A)|(A)|(W)||(W)|(RPM±600)|(CFM)|(inch H2O)|(dBA)|
|CBM-5512B-030-235|5|4.5~5.5|0.06|0.09|0.30||0.45|3,000|2.74|0.18|23.5|
|CBM-5512B-040-297|5|4.5~5.5|0.12|0.18|0.60||0.90|4,000|3.68|0.33|29.7|
|CBM-5512B-050-346|5|4.5~5.5|0.24|0.36|1.20||1.80|5,000|4.57|0.50|34.6|



- Notes: 1. At rated voltage, after 3 minutes. 

2. At rated voltage, room temperature, 65% humidity, 0 inch H **2** 0 static pressure. 

3. At rated voltage, 0 CFM airflow. 

4. Measured in an anechoic chamber as per ISO3745/GB4214-84 at rated voltage, with background noise 20±2 dBA at 1 m from the fan intake. 

5. All specifications are measured at 25°C, 65% relative humidity unless otherwise specified. 

## **PART NUMBER KEY** 

## **CBM - 5512B - 030 - 235 - XX - CXX** 

Base Number 

Fan Signals “blank” = no signals 20 = tachometer signal 22 = tachometer signal / PWM control signal 

Reserved for Custom Configurations 

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**SAME SKY** | **SERIES:** CBM-55B | **DESCRIPTION:** DC BLOWER 

**date** 08/27/2025 | **page** 2 of 6 

## **INPUT** 

|**INPUT**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating input voltage6||4.5|5|5.5|Vdc|
|starting voltage|||3.5||Vdc|
|Note:<br>6. See Model section on page 1 for specifc input voltage ranges.||||||
|**PERFORMANCE7**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|rated speed|at rated voltage, 25°C, after 3 minutes|3,000||5,000|RPM|
|air fow|at 0 inch H2O, see performance curves|2.74||4.57|CFM|
|static pressure|at 0 CFM, see performance curves|0.18||0.50|inch H2O|
|noise|at 1 m, rated speed|23.5||34.6|dBA|
|Note:<br>7. See Model section on page 1 for specifc values.||||||
|**PROTECTIONS / FEATURES8**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|auto restart|on all models|||||
|polarity protection|on all models|||||
|tachometer signal|available on “20” and “22” models|||||
|PWM control signal|available on “22” models|||||
|Notes:<br>8. See Application Notes for details.||||||
|**SAFETY & COMPLIANCE**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|insulation resistance|at 500 Vdc between frame and positive terminal|10|||MΩ|
|dielectric strength|at 500 Vac, 60 Hz, 1 minute between housing and positive terminal|||5|mA|
|safety approvals|UL/cUL 507, TUV (EN/IEC 62368-1:2020+A11)|||||
|EMI/EMC|EN 55032:2015, EN 55035:2017|||||
|life expectancy|at 40°C, 65% RH, 90% confdence level||70,000||hours|
|RoHS|yes|||||
|**ENVIRONMENTAL**||||||
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|operating temperature||-10||70|°C|
|storage temperature||-40||75|°C|
|operating humidity|non-condensing|35||85|%|
|storage humidity|non-condensing|35||85|%|



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**date** 08/27/2025 | **page** 3 of 6 

## **PERFORMANCE CURVES** 

## **CBM-5512B-030-235** 

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**----- Start of picture text -----**<br>
4.00<br>3.50<br>3.00<br>2.50<br>2.00<br>1.50<br>1.00<br>0.50<br>9.00<br>0.00 0.50 1.00 1.50<br>Air Flow (CFM)<br>Static Pressure (mm H₂0)<br>**----- End of picture text -----**<br>


## **CBM-5512B-040-297** 

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**----- Start of picture text -----**<br>
8.00<br>7.00<br>6.00<br>5.00<br>4.00<br>oY<br>BOO<br>1.00<br>9.00<br>0.00 0.50 1.00 1.50 2.00 2.50<br>Air Flow (CFM)<br>Static Pressure (mm H₂0)<br>**----- End of picture text -----**<br>


## **CBM-5512B-050-346** 

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12<br>ite)<br>8<br>6<br>4<br>2<br>a<br>is) 1 2 3<br>Air Flow (CFM)<br>Static Pressure (mm H₂0)<br>**----- End of picture text -----**<br>


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**SAME SKY** | **SERIES:** CBM-55B | **DESCRIPTION:** DC BLOWER 

**date** 08/27/2025 | **page** 4 of 6 

## **MECHANICAL** 

|**MECHANICAL**||||||
|---|---|---|---|---|---|
|**parameter**|**conditions/description**|**min**|**typ**|**max**|**units**|
|motor|4 pole DC brushless|||||
|bearing system|dual ball bearing|||||
|direction of rotation|counter-clockwise viewed from front of fan blade|||||
|dimensions|55 x 55 x 10.6||||mm|
|material|PBT (UL94V-0)|||||
|weight|||20||g|



## **MECHANICAL DRAWING** 

units: mm 

2 wire versions (+Vin & -Vin): UL 1007, 26 AWG 

3 wire versions (+Vin, -Vin, & tach): UL 1007, 26 AWG 

4 wire versions (+Vin, -Vin, tach, & PWM): UL 1061, 28 AWG 

|||||
|---|---|---|---|
|MOUNTING SCREW (Pan Head)||||
|Screw Type|Size|Standard|Torque|
|Machine Screw|M2<br>JIS|B1111-1974|2.5 kgf-cm|
|Self-tapping Screw|M3<br>JIS|B1122 Type 2|2.5 kgf-cm|



|WIRE CONNECTIONS|WIRE CONNECTIONS|
|---|---|
|Wire Color|Function|
|Red|+Vin|
|Black|-Vin|
|Yellow9|Tach Signal|
|Blue9|PWM|



**==> picture [461 x 207] intentionally omitted <==**

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Notes:    9. Wires only present on versions with output signals. 

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**SAME SKY** | **SERIES:** CBM-55B | **DESCRIPTION:** DC BLOWER 

**date** 08/27/2025 | **page** 5 of 6 

## **APPLICATION NOTES** 

## **Locked Rotor Protection/Auto Restart** 

At rated voltage, the current will be reduced or shut down to protect the motor from damage in 72 hours of locked rotor condition.  When the fan motor is locked by an external force, the device will temporarily turn off electrical power to the motor and restart automatically when the locked rotor condition is released. 

## **Polarity Protection** 

Able to withstand 10 minutes of reverse polarity connection between the positive and negative wires without causing damage. 

## **Tachometer Signal (Yellow Wire)** 

The tachometer signal is for detecting the rotational speed of the fan motor.  The output will be a square wave when fan is operating and VFG or VCE depending on the locked rotor position when fan motor is locked (See Figures 1~2 below). 

**Figure 1: Tachometer Output Circuit** 

## **Output Type: Open Collector** 

Vs: (VFG) 5 V fan: 3.3~5 V All others: 3.3~15 V Ic ≤ 5 mA R ≥ Vs/Ic VCE(sat) ≤ 0.5 V 

**Figure 2: Tachometer Output Waveform** 

**4 Pole Motor** N=RPM T=60/N (sec) FG=1/T*2 (Hz) N=FG*30 

## **PWM Signal (Blue Wire)** 

This wire is for speed control of the fan motor using a PWM input signal from the customer circuit (See Figure 3 below). 

**Figure 3: PWM Input Signal** 

PWM Frequency PWM VIH PWM VIL Model Range (kHz) (V) (V) CBM-5512B-030-235-22 5~50 2.7~5.5 0~0.7 CBM-5512B-040-297-22 5~50 2.7~5.5 0~0.7 CBM-5512B-050-346-22 5~50 2.7~5.5 0~0.7 ~~————~~ 

PWM Duty Cycle (%) = T1/T x 100% 

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**SAME SKY** | **SERIES:** CBM-55B | **DESCRIPTION:** DC BLOWER 

**date** 08/27/2025 | **page** 6 of 6 

## **REVISION HISTORY** 

|**rev.**|**description**|**date**|
|---|---|---|
|1.0|initial release|08/27/2025|



The revision history provided is for informational purposes only and is believed to be accurate. 

Same Sky offers a one (1) year limited warranty.  Complete warranty information is listed on our website. 

Same Sky reserves the right to make changes to the product at any time without notice.  Information provided by Same Sky is believed to be accurate and reliable.  However, no responsibility is assumed by Same Sky for its use, nor for any infringements of patents or other rights of third parties which may result from its use. 

Same Sky products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability.  A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 

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