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| Part Number | 1503 | 1503W | 1503-Y | 1503-YSY | 1503-ST |
| Manufacturer | Curtis Industries | Curtis Industries | Curtis Industries | Curtis Industries | Curtis Industries |
| Series | 1500 | 1500 | 1500 | 1500 | 1500 |
| Packaging | Box | Box | Bulk | Bulk | Bulk |
| Product Status | Active | Active | Active | Active | Active |
| Terminal Block Type | Barrier Block | Barrier Block | Barrier Block | Barrier Block | Barrier Block |
| Number of Circuits | 3 | 3 | 3 | 3 | 3 |
| Number of Wire Entries | 6 | 6 | 6 | 6 | 6 |
| Pitch | 0.375" (9.53mm) | 0.375" (9.53mm) | 0.375" (9.53mm) | 0.375" (9.53mm) | 0.375" (9.53mm) |
| Number of Rows | 2 | 2 | 2 | 2 | 2 |
| Current Rating (Amps) | 20A | 20A | 20A | 20A | 20A |
| Voltage Rating | - | - | - | - | - |
| Wire Gauge | 10-22 AWG | 10-22 AWG | 10-22 AWG | 10-22 AWG | 10-22 AWG |
| Top Termination | Screws | Screws with Captive Plate | Screws | Screws | Screws with Solder Lugs, Dual |
| Bottom Termination | Closed | Closed | PC Pin | PC Pin | Closed |
| Barrier Type | 2 Wall (Dual) | 2 Wall (Dual) | 2 Wall (Dual) | 2 Wall (Dual) | 2 Wall (Dual) |
| Features | Flange | Flange | Flange | Flange | Flange |
| Color | - | - | - | - | - |
The following parts include "1503-ST" in Silicon Labs 1503-ST.
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