SWIT KA-B21S V-Mount to B-Mount Conversion Plate

SWIT KA-B21S V-Mount to B-Mount Conversion Plate

The SWIT KA-B21S V-mount to B-mount conversion plate enables compatible B-mount cinema cameras to operate from high-voltage V-mount batteries. The adapter passes the battery’s voltage directly to the camera without conversion, providing a streamlined power solution for professional crews working across mixed battery-mount systems.

Designed for the ARRI ALEXA 35, ARRI ALEXA 265, Blackmagic Design URSA Cine, and other compatible B-mount cameras, the plate supports 26V and 28.8V V-mount batteries. It also activates the 28.8V output mode of the SWIT PB-H290S bi-voltage battery, delivering a 22–33.6V operating range to supported high-voltage equipment.

The KA-B21S accepts SWIT and compatible third-party V-mount batteries, helping rental houses, camera departments, and production teams consolidate their available power inventory. Its CNC-machined aluminum unibody housing provides a durable interface for demanding production environments, while integrated circuit protections support reliable operation on professional camera rigs.

Key Features

• V-Mount Battery Compatibility: Allows compatible V-mount batteries to power cameras equipped with a B-mount interface.
• Direct Voltage Pass-Through: Outputs the same voltage supplied by the attached V-mount battery without voltage conversion.
• High-Voltage Camera Support: Works with compatible cinema cameras requiring 26V or 28.8V battery power.
• Bi-Voltage Battery Activation: Activates the 28.8V mode of the SWIT PB-H290S battery for supported B-mount cameras.
• Third-Party Battery Support: Accepts compatible 26V and 28.8V V-mount batteries from other manufacturers.
• Professional Camera Compatibility: Supports select ARRI and Blackmagic Design high-voltage cinema cameras.
• Aluminum Unibody Housing: Uses CNC-machined construction for durability in professional production environments.
• Integrated Protection: Incorporates multiple circuit protections for safer and more reliable power delivery.

Technical Specifications

• Model: KA-B21S
• Product Type: V-mount battery to B-mount camera conversion plate
• Battery-Side Mount: V-mount
• Camera-Side Mount: B-mount
• Battery Bays: 1
• Supported V-Mount Battery Voltages: 14.4V, 26V, and 28.8V
• Output Voltage: Same as the attached V-mount battery
• High-Voltage Operating Range: 22–33.6V with a compatible 28.8V battery
• Compatible SWIT Bi-Voltage Battery: PB-H290S
• Compatible SWIT High-Voltage Battery: HB-C420S
• Third-Party Battery Compatibility: Compatible 26V and 28.8V V-mount batteries
• Compatible Cameras: ARRI ALEXA 35, ARRI ALEXA 265, Blackmagic Design URSA Cine, and compatible high-voltage B-mount cameras
• Housing: CNC-machined aluminum unibody
• Protection: Multiple circuit protections

What's In the Box

• SWIT KA-B21S V-Mount to B-Mount Conversion Plate