CM-MSS.21S (1SVR730722R1400): CM-MSS motor-temperature monitoring relay application and replacement review
CM-MSS.21S (1SVR730722R1400) is a CM-MSS motor-temperature monitoring relay. The technical data below separates documented family characteristics from ordering-code options that need verification on the actual unit.
Technical facts to verify
| Technical item | Verified value / selection note |
|---|---|
| Complete designation | CM-MSS.21S (1SVR730722R1400) |
| ABB order code | 1SVR730722R1400 |
| Supply | 24–240 V AC/DC |
| Outputs | 1 NO and 1 NC |
| Input purpose | Motor thermistor monitoring |
| Diagnostics | Sensor cable break and short-circuit monitoring |
The data for CM-MSS.21S (1SVR730722R1400) supports initial identification. For a purchase decision, use the actual nameplate and the manufacturer's documentation for the complete installed configuration.
Site acceptance and maintenance
For CM-MSS.21S (1SVR730722R1400), Test a simulated hot sensor and sensor-circuit fault, observe contact states and verify the motor cannot restart contrary to the approved cause-and-effect logic.
File the test record under CM-MSS.21S (1SVR730722R1400) and keep the as-left wiring, settings and firmware with the asset history. Site safety procedures and the exact manufacturer's instructions govern the work.
Where this designation fits
For CM-MSS.21S (1SVR730722R1400), Use thermistor protection to detect winding overheating independently of a motor-current overload element. Determine whether the trip must latch and how a restart is authorized.
Record the operating duty, supply and field interfaces of CM-MSS.21S (1SVR730722R1400). A same-family designation may still have a different electrical rating, connection, firmware or approval.
Configuration gate before ordering
For CM-MSS.21S (1SVR730722R1400), Verify PTC sensor circuit, control supply, contact logic, reset function and the wiring into the motor starter. Confirm any hazardous-area approval at the exact order code.
The RFQ for CM-MSS.21S (1SVR730722R1400) should include the full designation, quantity, clear nameplate photo, revision, drawings and required delivery date. Request explicit confirmation of every proposed alternative.
Related designations in the same product line
The following codes have a same-line relationship to CM-MSS.21S (1SVR730722R1400). Their ratings and options can differ; they are references for an enquiry, not approved substitutes.
No additional exact same-line designation is shown here for CM-MSS.21S (1SVR730722R1400). Do not assume a different product family is interchangeable.
Procurement handover
Use CM-MSS.21S (1SVR730722R1400) consistently in the quotation, purchase order and maintenance record. Ask the supplier to state whether the offered item is the exact designation or a documented successor.
Before energizing CM-MSS.21S (1SVR730722R1400), compare the supplied labels, accessories and approvals with the approved engineering documents. Retain the inspection and acceptance results for future service.
