The short answer: a control cabinet usually needs seconds to minutes, not hours — enough for a PLC to finish its cycle and an HMI to log the event before a controlled stop. For that duty an 18 W DC unit on the cabinet's own 12–24 Vdc bus is typically enough, provided the cabinet's thermal rise is part of the design.
One working day to a written answer · sample from one unit
Control cabinets are a different problem from CCTV. The load is small (30–150 W) and the runtime is short (seconds to 30 minutes), but the reliability requirement has no tolerance: a PLC that loses power mid-cycle can leave a machine in an unsafe state, and an HMI that drops loses the event log you need afterwards.
PE-DU18-C takes 12–18 Vdc in, delivers 18 W across DC outputs, and transfers in 10 ms or less. IP20 as standard, with an IP54 housing where the cabinet is washed down or sits outdoors. For higher loads, DIN-rail DC systems at 24 V and 48 V to 10 kW with dry-contact alarms.
Every unit is aged at rated output before packing, and the record carries the serial number — which is what an auditor asks for, not a brochure. CE, RoHS and UN38.3 documentation is available before order.
Yes — the -C variant ships with a DIN clip. Tell us the rail standard if it is not 35 mm, and we confirm the bracket in the build sheet.
It sits in parallel on the DC bus, not in series with the PSU, and the transfer is a static switch. If your PLC has a defined hold-up requirement, tell us the number and we test against it rather than assuming.
Only if the cabinet has AC loads that must ride through. If everything runs on the 24 Vdc bus, a DC unit is smaller, cooler and more efficient.
Available on request with the thermal design included. An unventilated sealed box with a battery inside needs the heat path designed, not just a gasket.
Camera count, adapter rating or cabinet bus voltage is enough to start. You get a model, a runtime figure and the document list for your market.