Panels and Equipment Selection Guide
Complete selection guide for electrical enclosures, combination boxes, junction boxes, DIN rails, busbar distribution blocks and panel thermal management equipment.
What are electrical panels and panel equipment? Electrical panels and enclosure accessories house switchgear, automation controllers, and power distribution blocks while providing mechanical mounting, busbar distribution, and internal climate control.
This guide covers the complete ecosystem in the Panels and Equipment category. For enclosure hulls specifically, see the Panels Selection Guide.
Product groups in this category
- Panels: Surface- and flush-mounted sheet metal enclosures, ABS/polycarbonate plastic enclosures, fiberglass-reinforced polyester cabinets, and modular consumer units.
- Socket-mounted combination boxes and empty combination boxes: Workshop and site power boxes with integrated MCB windows and CEE industrial socket cutouts.
- Junction box enclosures, meter boxes, and fuse distribution boxes: Branching boxes, utility meter housings, and main cutout boxes.
- Busbars and distribution blocks: Stepped multipole distribution blocks, neutral/earth brass bars, and busbar support insulators.
- Rails, rail risers, and mounting plates: 35 mm DIN rails, angled brackets, and galvanized/perforated backplates.
- Panel thermostats, panel heaters, panel sockets, and panel accessories: Anti-condensation heaters, fan thermostats, DIN-rail service sockets, filter fans, and locks.
Panel components comparison table
| Component Group | Key Sizing Parameter | Standard / Rating | Primary Function |
|---|---|---|---|
| Enclosure Body | Width × Height × Depth (mm), IP/IK | IP40 – IP65, IK08–IK10 | Environmental and mechanical protection of switchgear |
| Combination Box | MCB module count (4–16M) + socket cutouts | IP44 / IP67 | Local three-phase and single-phase power distribution |
| Distribution Block / Busbar | Rated current (80 A – 630 A) and terminal count | 1P / 2P / 4P or N/PE bar | Splitting main incoming feeders to branch circuits |
| DIN Rail & Mounting Plate | 35×7.5 mm / 35×15 mm rail, plate dimensions | IEC 60715 | Mechanical mounting of breakers, contactors and terminals |
| Panel Thermostat & Heater | Setpoint range (0–60 °C) and heater wattage (W) | NO (Cooling) / NC (Heating) | Preventing overheating and moisture condensation |
Frequently asked questions
What is the difference between NC (red) and NO (blue) panel thermostats?
An NC (Normally Closed, red dial) thermostat controls a panel heater: its contact stays closed below the setpoint to prevent condensation and opens once the cabinet warms up. An NO (Normally Open, blue dial) thermostat controls a cooling fan: its contact closes when internal temperature exceeds the setpoint.
When should I use a stepped distribution block instead of jumpering terminals?
When feeding multiple branch breakers from a main MCCB or isolator above 80 A, a polycarbonate-shrouded multipole distribution block provides touch-safe IP20 phase separation, higher short-circuit withstand capability, and cleaner wiring than daisy-chained cables.
How much spare space should be planned inside an electrical panel?
Reserve at least 20–25% free DIN-rail length and backplate area to ensure adequate heat dissipation, wire-duct bending radius, and future circuit expansion.