12v 10a switching power supply price stays on its own BOM line

Four lines that a mixed bill often collapses

1. Line A, the module

   Write maker, model, 12 V, 10 A, and the 120 W power rating. If the sheet lists a peak above 10 A, ask for the seconds that peak is allowed. A peak without a time is not a second rating.

2. Line B, the inlet

   State 100-240 VAC with frequency range at 50 Hz and 60 Hz, or a DC plant feed if that is truly the input. An IEC inlet and a hardwired lug are different lines. Connector mating cycle is noted only when crews unplug the inlet often.

3. Line C, the box and the air

   Enclosed, open-frame, or a 1U shelf. A rack unit is 44.45 mm and applies to the shelf, not to every brick. Fan or convection, plus the curve at 40 °C and at 50 °C. Ingress protection stays empty until the model states a code.

4. Line D, the money scope

   Currency, per-module or whole-order basis, quantity, Incoterm, freight, and duties. A sample of 2 units and a lot of 80 units can carry different timing. Write a day, such as 2025-12-02, on the quantity it belongs to.

Open choices before a substitute is accepted

Regulation, hold-up in milliseconds, and ripple in millivolts are open until the datasheet for that model states them. Impedance in milliohms is open until the host spec asks for it. Runtime is open, and usually irrelevant, unless a battery is on the same bill. Measurement accuracy and calibration traceability belong to the meter in the acceptance plan, not to the module price.

Vendor-marked 12 V brick versus another maker’s brick

Side A, the vendor-marked brick: it may match a radio maker’s accessory list and the support note that names that accessory. Ask for the current list, not a screenshot of an old catalog. Side B, another maker’s brick: it may be the line a factory can actually build, if pinout, regulation, and cooling are checked on the host. A shared 120 W label does not finish that check. LinkScope Sourcing 49 keeps both replies only when the rows still match.

New build versus a pulled spare

Side A, new: the drawing and the safety file are easier to request, and the buyer may want that path for a cabinet that will be cloned. Side B, a pulled spare: it can fill a discontinued footprint when condition, a test note, and warranty months are explicit. The desk does not grade the spare. The preference on the form is the buyer’s, and it is not a verified rank.

Background: a systems integrator had one spreadsheet cell labeled “12 V power” for eight sites. Process: the desk split that cell into the 120 W module, a 1.5 m cord, and a DIN clip, and asked each factory which of the three it had priced. Result: two replies had priced only the cord kit, so they left the module column. The scene is a line-identity check, not a discount story.

Leave switching capacity, forwarding rate, wavelength, and optical budget on their own bills. Power over Ethernet is a switch-port budget. A 24 V 10 A brick is 240 W and belongs on the site-load page, not inside this 12 V cell. The inquiry rows are labels. The procurement brief walks the same split in prose.

FCC equipment authorization and an NRTL file are requested when they name the model on line A. A family certificate is not copied onto line A. The TEC infrastructure page is question context only and is not US approval.