Thermal Imaging for Switchgear Inspection: Recommended Camera Models

Choose a thermal camera for switchgear by calculating target coverage at working distance, then selecting optics, NETD, radiometric workflow, and reporting capability.

Last updated: 2026-09-18

The decision target is usually a connection, not the whole panel

Switchgear thermography succeeds when the smallest decision target has enough pixels at the permitted working distance and is in focus. Write down the target size, viewing distance, access restrictions, expected temperature rise, surface condition, and required report fields before comparing detector resolution. Shiny busbars and lugs also require emissivity and reflected-temperature practice; a sharp image alone is not a temperature measurement.

Recommended thermal cameras

| Model | Useful published capability | Best fit |

| --- | --- | --- |

| FLIR T865 | 640 x 480 IR resolution; NETD below 30 mK with 42-degree lens; interchangeable 6, 14, 24, 42, and 80-degree optics; radiometric files | Large facilities that need lens flexibility, route reports, and close or long-distance electrical targets |

| HIKMICRO G61 | Chinese brand 640 x 480 class industrial thermal camera with radiometric workflow and interchangeable-lens options | Plant maintenance teams needing a high-resolution electrical inspection platform with local support |

| HIKMICRO M31 | Chinese brand handheld thermal camera family suited to planned inspection routes | Routine panels, motors, and accessible switchgear where the working distance and target size fit the fitted lens |

The final model must be confirmed against the current regional data sheet, lens bundle, and calibration availability because thermal-camera options vary by market.

Parameters to purchase

Lens and IFOV: Calculate pixels on the smallest lug or termination at the actual distance.
NETD and temperature range: Choose sensitivity for the expected Delta-T and a validated range for the recorded temperature.
Focus: Require manual, assisted, or laser-assisted focus that works across the route.
Radiometry: Require full radiometric images, editable emissivity/reflected temperature, spot/area tools, and exportable reports.
Route workflow: Require asset ID, image naming, trending fields, battery endurance, and a report template.

Acceptance test

Inspect a representative cabinet at the farthest approved distance. Confirm target focus, pixel coverage, image storage, emissivity adjustment, and the ability to create an asset-linked report. This is the correct time to decide whether a telephoto lens is required.