02Reasons like an engineer
Can this stand in for that?
Sharing specs isn't the same as being interchangeable. A substitute is valid only when it meets or exceeds every rating and fits every interface exactly — and raising a rating often changes an interface.
R01
Capability can exceed
A seal rated to 320 °C can serve where 280 °C is needed. Insulation class H can stand in for F. Ratings are directional, and MIDAS knows which way each one points.
R02
Interfaces must match
A higher pressure-class flange is stronger and still won't bolt into the same line. Bore, flange, mounting, voltage and phase match exactly — capability rose, fit was lost.
R03
Bigger isn't free
An oversized motor isn't an upgrade. Its overload relay, contactor, cable and breaker were all sized to the original nameplate. A rating other equipment was sized against never upgrades for free.
R04
Kind before spec
An actuator is not a motor, however much the specs overlap. Equipment-kind walls mean different equipment never merges or substitutes, while the same equipment written two ways is recognised as one.
R05
Traps, encoded
IP67 doesn't imply IP65 — they're different tests. A higher-efficiency motor can draw far more starting current and weld an undersized contactor. These go out as conditions, never silent passes.
R06
Built-for is reported
Parts written “for” a specific machine are kept apart from general-purpose stock and labelled with what they were built for — shown, never hidden, and ranked below equal general parts.
Verdicts, not scores
Identical
The same part under another code.
Substitutable
Meets or exceeds every rating, and every interface fits.
Conditional
Could serve — with the condition stated on the row.
Not substitutable
Refused, with the reason named.
Undetermined
Not enough data to say. MIDAS says so.
Every verdict names the rule it used, so a reviewer can overrule it.