Choosing the Right Power Supply for an Embedded Cash Machine PC

Embedded machine PCs die from bad power decisions more often than bad software. When a supply must be replaced, spec it in this order.

1. Form factor and mounting

Confirm the bay physically accepts the replacement: proprietary low-profile formats and standard shapes are not interchangeable. Measure depth including connector overhang, and check whether mounting holes align or brackets are needed.

2. The rails that actually matter

• The 12 V rail carries almost everything on embedded boards; price the supply by its 12 V amperage, not total wattage.
• Count required connectors twice over — fan headers and peripheral rails are where cheap replacements fall short.

3. Duty and protection

24/7 duty means continuous load ratings, not peak marketing watts. Verify over-current, over-voltage and short protection, and require stable output during motor-start sag from sibling devices — the classic cause of mid-transaction reboots. Lockout/tagout discipline during PSU swaps is not optional; the OSHA electrical-safety guidance is the baseline any competent technician works to.

4. Serviceability

A supply that needs a screwdriver and a harness rebuild every swap will be bypassed by tired technicians. Prefer tool-free or single-bracket access where the machine allows.

RMG stocks embedded-class supplies for the common cash-machine platforms with rail specs documented up front. Upstream, decide the whole power chain together: the UPS and surge design guide and the cabinet environment rules set the conditions any supply must survive — the full set lives in the RMG Knowledge Base.