The table below indicates the selection of the power switching components necessary to build up a star delta starters, with mechanical interlocks between star and delta contactors, suitable for mounting on DIN rail in a suitable control panel.
Notes:
- In some cases, the starter can be supplied assembled (prefix LC3) with the overload relay supplied separately. These should be checked on a case-by-case basis, as some are obsolete.
- Overload selection is based on the motor full load current (FLC) x 0.58 due to the mounting position in the 'delta loop'.
- In the case of 110 and 132 kW there is a requirement for a separate control relay and timer to ensure sufficient delay in the changeover time from star to delta contactor.
| Motor FLC against power at 415V AC based on average typical motors | Complete Starters (Including Interlock) | Star Delta Starter components for customer assembly Note: Star Delta Kit includes timer, power connections and mechanical interlock | Overload Selection | |||||
| kW at 415V AC | Motor FLC (A) | Starter Plate Mounted | Line Contactor | Delta Contactor | Star Contactor | Star Delta Kit | Overload current (A) (FLC * 0.58) | Overload Class 10A (Adjustment range shown in brackets) |
| 7.5 | 14 | LC3D09A•• | LC1D09*** | LC1D09*** | LC1D09*** | LAD91217 | 8 | LRD14 (7-10A) |
| 11 | 21 | LC3D12A•• | LC1D18*** | LC1D12*** | LC1D09*** | LAD91217 | 12 | LRD16 (9-13A) |
| 22 | 40 | LC3D18A•• | LC1D25*** | LC1D25*** | LC1D09*** | LAD93217 | 23 | LRD22 (16-24A) |
| 30 | 55 | LC3D32A•• | LC1D32*** | LC1D32*** | LC1D18*** | LAD93217 | 32 | LRD35 (30-38A) |
| 37 | 66 | Not Available | LC1D40A*** | LC1D40A*** | LC1D40A*** | LAD9SD3 | 38 | LRD340 (30-40A) |
| 55 | 100 | Not Available | LC1D50A*** | LC1D50A*** | LC1D40A*** | LAD9SD3 | 58 | LRD365 (48-65A) |
| 75 | 135 | LC3D80••A64 | LC1D80** | LC1D80** | LC1D80** | LA9D8018 | 78 | LRD3363 (63-80A) |
| 110 | 200 | LC3D115••A64 | LC1D115A*** | LC1D115A*** | LC1D115A*** | LAD9150SD19 busbars LAD5CM interlock LADT2 timer LADN11 aux for star contactor CAD32•• control relay | 116 | LRD4367 (95-120A) |
| 132 | 240 | Not Available | LC1D150A*** | LC1D150A*** | LC1D150A*** | 139 | LRD4369 (110-140A) | |
Replace *** with the following codes for coil voltage:
BNE - 24-60V AC/DC
EHE - 48-130V AC/DC
KUE - 100-250V AC/DC
LSE - 200-500V AC/DC (Only for LC1D115A & LC1D150A - For 415V AC on other contactors use 'N7')
Replace •• with the following codes for coil voltage:
B7 - 24V AC
F7 - 110V AC
P7 - 230V AC
U7 - 240V AC
N7 - 415V AC
There is a link below to our Coordination & Standards guide, this contains various Type 1 and Type 2 coordination tables for both star delta & direct online (DOL) starters along with other information on selecting contactors for various uses.
The below drawing is an example of how a star delta starter power circuit and control circuit could look:
Released for: Schneider Electric Ireland
