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SWIT KA-B30B B-Mount to B-Mount Hot Swap Plate

BH #SWKAB30B • MFR #KA-B30B
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SWIT KA-B30B B-Mount to B-Mount Hot Swap Plate
Key Features
  • Works with ARRI ALEXA35
  • B-Mount Hot Swap Plate
  • 2 x D-Tap Regulated 14V Outputs
  • 2-Pin LEMO Regulated 14V Output
Swap your batteries out without needing to switch off your camera using this KA-B30B B-Mount to B-Mount Hot Swap Plate from SWIT. The KA-B30B easily powers the ARRI ALEXA35 camera at 28.8V (22-33.6V), and when you remove the B-mount battery, the KA-A30B output regulates 28V to the camera for hot swapping.
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SWIT KA-B30B Overview

Swap your batteries out without needing to switch off your camera using this KA-B30B B-Mount to B-Mount Hot Swap Plate from SWIT. The KA-B30B easily powers the ARRI ALEXA35 camera at 28.8V (22-33.6V), and when you remove the B-mount battery, the KA-A30B output regulates 28V to the camera for hot swapping.

The KA-B30B has 32Wh/3Ah battery cells inside and a 200W constant high load that can ensure two minutes for hot swapping with an LCD screen that displays countdown seconds when changing the battery. Once your battery is removed, a 120-second countdown begins to give you enough time to swap out the depleted battery with one that is fully charged, which then recharges the hot swap plate and resets the countdown to 120.

Key Features
  • 28V, 32Wh 3Ah battery cells inside
  • 200W constant high load
  • At least 2-minutes runtime
  • 120-second countdown display
  • Two D-Tap regulated 14V outputs
  • 2-pin LEMO regulated 14V output
  • USB 5V/2A power output
  • 22 to 33.6V 8-pin input for power station hot swap
  • Aluminum CNC unibody housing
  • Multiple circuit protections

SWIT KA-B30B Specs

Plate Front / Battery Mount
B-Mount
Number of Battery Bays
1
Inputs/Outputs
1x LEMO 2-Pin Output
2x D-Tap/P-Tap Output
1x USB-A Output
Plate Material
Aluminum
Dimensions
5.6 x 3.7 x 2" / 143 x 93 x 50.2 mm
Weight
1.6 lb / 749 g
Packaging Info
Package Weight
1.97 lb
Box Dimensions (LxWxH)
8.2 x 6.3 x 2.9"

SWIT KA-B30B Reviews

Genius!

By Marc
Rated 4 out of 5
Date: 2025-11-05

I Saw This On A Whim And Love It. I Use This On My Ursa Cine 17K. When I Don't Need The Balance/weight Of The Shark Fin That Holds 2 Batteries, This Is My Go-to And Daily Driver. The LED Tells You Exactly How Much Time You Have To Swap Batteries, And It Has Not Let Me Down. A Small Thing To Think About But Works Really Well!

Useful when moving fast

By Joyce
Rated 5 out of 5
Date: 2025-02-16

Works as intended and very helpful on faster moving commercial or doc shoots where powering down to swap batteries sometimes means missing the shot all together. The 120 seconds is plenty of time to comfortably swap. It does add a bit to the weight of the rig but about the same if you have this plus a smaller capacity battery (vs one larger capacity battery).

See any errors on this page?

Will this work with any B-Mount Camera, such as ...

Will this work with any B-Mount Camera, such as the BlackMagic 12k Cine LF?
Asked by: JD
Yes, the SWIT KA-B30B B-Mount to B-Mount Hot Swap Plate is designed to work with cameras that require high voltage; this includes the Blackmagic Design URSA Cine 12K LF Camera.
Answered by: Elliot A
Date published: 2025-09-08

When the unit is plugged into AC power via the ...

When the unit is plugged into AC power via the 8-pin, does the camera and all outputs on the device work without battery?
Asked by: JD
Yes, when the SWIT KA-B30B B-Mount to B-Mount Hot Swap Plate is powered by AC, the camera and all outputs on the plate function properly, without battery.
Answered by: Chris H
Date published: 2025-09-10

Is this unit compatible with any other third ...

Is this unit compatible with any other third party B mount batteries?
Asked by: Don
Yes, The SWIT KA-B30B B-Mount to B-Mount Hotswap Plate would support 3rd party B-Mount batteries.
Answered by: Chris H
Date published: 2022-11-09
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