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Overload Relays
Bulletin 825 SMM™ Smart Motor Manager
The Bulletin 825 SMM Smart Motor Manager is a modular, multifunction motor protection relay designed to provide optimal utilization of motors that operate critical applications. An accurate thermal model of the motor is achieved through direct current and temperature sensing. The modular design of the SMM motor protection relay allows an installer to select the level of protection necessary for a given application with capability for future expansion. Two-Body Simulation Most thermal overload protective devices employ a one-body thermal simulation model that assumes that a motor’s thermal response is uniform throughout. The SMM motor protection relay uses a two-body simulation which takes into account the different temperature rise characteristics of the stator windings and the iron mass of the motor. The result is a higher precision thermal image.
Ratings 0.5…2000 A Conformity to Standards IEC 947-4 CSA 22.2 No. 14 UL 508 Approvals CE CSA Certified UL Listed
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| Functional Summary |
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| Feature | Basic Unit | Option Card | ||
| MST | MLV 1 | MMV 1 | ||
| Thermal Overload |
ü |
— |
— |
— |
| Phase Imbalance (Asymmetry) |
ü |
— |
— |
— |
| Overcurrent |
ü |
— |
— |
— |
| Undercurrent |
ü |
— |
— |
— |
| Ground (Earth) Fault (Holmgreen/Residual) |
ü |
— |
— |
— |
| Starting Time Monitoring |
ü |
— |
— |
— |
| Limited Starts/Hour |
ü |
— |
— |
— |
| Emergency Start |
ü |
— |
— |
— |
| Short Circuit |
— |
ü | — |
— |
| Ground (Earth) Fault (Core Balance CT) |
— |
ü |
— |
— |
| Stalling During Start |
— |
ü |
— |
— |
| PTC Thermistor Monitoring |
— |
ü |
— |
— |
| Analog Output |
— |
ü |
— |
— |
| Two-Speed Motor Protection |
— |
ü |
— |
— |
| Wye-Delta Start Control |
— |
— |
ü |
— |
| Phase Reversal (Sequence) |
— |
— |
ü |
— |
| Phase Failure |
— |
— |
ü |
— |
| 7 100 Ohm Platinum RTD Channels (1 - Ambient) |
— |
— |
— |
ü |
1 Use of the MLV and MMV option cards is mutually exclusive. |
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