ATEN VS381B 3-Port True 4K HDMI Switch
The ATEN VS381B is a three-input, single-output HDMI switch built around a straightforward problem: you have more 4K sources than display inputs. Where it earns its place is in the signal quality — it passes 4K video at the full 4096 x 2160 resolution (DCI 4K) and 3840 x 2160 (UHD 4K) at 60Hz with 4:4:4 chroma sampling, meaning you get uncompressed color per pixel rather than the subsampled signal that cheaper switches quietly downsample. If you're feeding a 4K display from a security workstation, digital signage player, or AV presentation source, that distinction matters for text legibility and color accuracy.
Overview
The VS381B handles up to three HDMI sources and routes them to one display or monitor with no signal degradation at distances up to 5 meters. Input selection is handled via a single front-panel push button — straightforward for integrators who need a physical control path without a software dependency. The unit also includes an IR extension jack (3.5mm mini stereo female) that extends IR remote control reach up to 5 meters, useful when the switch is rack-mounted or positioned out of line-of-sight from the operator. This puts it squarely in the category of HDMI switches designed for permanent, structured AV installations rather than desktop hot-swapping.
Key Features
- True 4K at 60Hz 4:4:4: Supports both DCI (4096 x 2160) and UHD (3840 x 2160) at 60 frames per second with full 4:4:4 chroma — no color compression artifacts. At 5 meters, you retain that full signal spec, which matters for any display used for medical imaging, control room monitoring, or precise color reference work.
- Three HDMI Inputs, One Output: Three source devices share a single display without unplugging cables. For a security operations desk running a workstation, NVR client, and a secondary laptop input, this eliminates the manual cable swap that breaks workflow during incidents.
- Physical Push-Button Input Selection: Front-panel button cycles through inputs without requiring software, a driver, or network access. In hardened or air-gapped environments where adding another software-controlled device creates a compliance headache, hardware-only switching is the right answer.
- IR Extension Port — 5m Range: The 3.5mm IR jack lets you place a remote IR receiver up to 5 meters away from the switch. If the VS381B lives in a rack or AV closet, operators can still switch inputs from the desk using a standard IR remote — no need to walk to the equipment.
- Operating Humidity up to 80% RH Non-Condensing: Rated for environments up to 80% relative humidity without condensation. Suitable for server rooms, control rooms, and AV closets that run through seasonal temperature swings without active dehumidification.
- Compact Rack-Mountable Form Factor: The unit supports rack integration, keeping structured AV installations tidy and cable runs predictable. Combine with a compatible ATEN rack mounting kit for 1U or half-rack deployment where space is at a premium.
Integration and Compatibility
The VS381B operates as a passive switching device — it requires no VMS integration, no driver installation, and no network connectivity. Any HDMI source that outputs at or below 4096 x 2160 @ 60Hz will work. That includes NVR client outputs, workstation GPU ports, media players, and presentation laptops. The IR extension port accepts standard IR receivers, giving you remote switching without proprietary hardware. For video surveillance control room builds where a single 4K monitor needs to display feeds from multiple sources — NVR direct output, VMS workstation, and a secondary review station — the VS381B handles the switching without touching the network stack. Review your display's HDMI input specification to confirm 4K 60Hz 4:4:4 passthrough support end-to-end; the switch won't be the bottleneck, but the display or cable run could be.
Frequently Asked Questions
Q: What is the maximum supported resolution on the VS381B?
A: The VS381B supports up to 4096 x 2160 (DCI 4K) and 3840 x 2160 (UHD 4K) at 60Hz with 4:4:4 chroma sampling — the full uncompressed color signal.
Q: How far can the VS381B transmit signal at full 4K resolution?
A: ATEN specifies a maximum cable distance of 5 meters while maintaining the full 4096 x 2160 / 3840 x 2160 @ 60Hz 4:4:4 spec. Longer cable runs may require an active extension solution.
Q: Does the VS381B require any software or drivers to operate?
A: No. Input switching is handled by a single front-panel push button. There is no software, driver, or network dependency — it functions as a purely hardware-controlled device.
Q: What is the IR extension port on the VS381B used for?
A: The 3.5mm mini stereo IR jack allows connection of an external IR receiver, extending remote control range up to 5 meters from the switch. This is useful when the unit is rack-mounted or not in direct line of sight of the operator.
Q: What humidity range is the VS381B rated for?
A: The VS381B operates in environments from 0 to 80% relative humidity, non-condensing — suitable for typical server rooms and AV equipment closets.
Q: How many HDMI sources can the VS381B handle?
A: The VS381B accepts three HDMI inputs and routes the selected source to one HDMI output display or monitor.
The VS381B comes up regularly in control room and security operations builds where the display budget tops out at one 4K monitor but the source count doesn't. The thing that separates it from budget alternatives is the 4:4:4 chroma passthrough at 60Hz — I've seen integrators spec cheaper switches that quietly drop to 4:2:0 at 4K 60Hz, and the result on a 4K monitor used for reviewing surveillance footage or reading text-heavy dashboards is noticeably softer. That's not a risk here.
Technical Highlights:
- 4096 x 2160 @ 60Hz 4:4:4: Full DCI 4K with uncompressed chroma — the switch doesn't impose a color subsampling penalty the way lower-tier units do at maximum resolution.
- 5-Meter IR Extension: The 3.5mm IR jack gives you remote-controlled input switching from up to 5 meters — practical for rack deployments where the front panel is behind a closed rack door.
- Hardware-Only Switching: Single push button, no driver stack, no network exposure. In a segmented security network where adding software-controlled devices requires a change request, this matters.
Deployment Considerations:
- The 5-meter maximum distance spec applies to the signal cable run at full 4K 60Hz 4:4:4. If your source-to-switch or switch-to-display run exceeds 5 meters, plan for an active HDMI extender in the signal chain — the VS381B itself won't compensate for cable attenuation beyond that spec.
- There is no RS-232 or IP control port on this unit. If your control system (Crestron, AMX, QSC) needs to automate input switching, this switch won't integrate — you'd need a model with serial or network control in the ATEN lineup.
Best fit: security operations centers and control rooms with a single 4K reference monitor, three source inputs (NVR output, VMS workstation, secondary review PC), and a requirement to keep the switching device off the network entirely.
