AS9100 Rev D/ISO 9001:2015 Certified
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RB-126 Power Booster DC to DC
(KGS products can only be shipped to U.S. address only.)
(DAI Part# RB126)
RB series is a pulse width-modulated DC to DC converter that provides regulated +28VDC up to 5.0 AMPS
Converter transforms an unregulated input from a 12V battery to a regulated +28VDC output in a bootstrap mode
RB series is primarily intended for use in an aircraft with 12VDC battery system to operate 28VDC equipment (especially during periods when the battery is not charged)

State of the art design for regulation and positive logic for output over voltage protection
Output is adjustable to 28 ±2VDC via an internal trim pot
Designed to meet various applicable portions MIL-STD 704 notice three, MIL-STD-202 and MIL-T-5422F class 1A
The Model RB series is serviceable, small and lightweight (110 watts per pound and 5.8 watts per cubic inch for the RB-126)
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Specifications RB-125 RB-126
Input Voltage 11 to 16VDC 13.5 to 16VDC
Input Current 14 to 11A DC 12 to 11ADC
Output Voltage 28VDC 28VDC
Output Current 5.0 AMPS 6.0 AMPS
Efficiency @ Full Load 87% 90%
Output Ripple 50 mV p-p plus input ripple
Regulation 2% for line, 2% load & 2% temperature
Refer to graph of input vs. output voltage
Load Transient 2V maximum overshoot for 40 mSec
Response From FL to NL 4V maximum undershoot for 10 mSec from NL to FL
Output voltage collapses to input DC voltage when load exceeds approximately 6.5 to 7.5 amp
Protection Over voltage circuit limits output to approximately 33VDC
Temperature -55°C to +71°C (sufficient cooling required @ +71°C ambient); 25 SCFM of air or base plate temperature held @ 71°C
Altitude 55,000’
Size 2.3" H x 2.3" W x 5.8" L, 5.7 cm H x 5.7 cm W x 14.6 cm L
Weight 1.5 lbs. (683 g)
PIN Number Description Remarks
A +13.75VDC input Up to 16VDC (see specs)
B Common ground Input/output return
C +28VDC output Regulated, factory set
D NC No connection
E Connected to PIN A Parallel to input line
Model Mating Plug Receptacle
RB-125 MS3102A14S5P MS3106A14S5S
RB-126 MS3102A14S5P MS3106A14S5S
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