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| Part Number | O-2 | O-4 | O-1 | O-3 |
| Manufacturer | Curtis Industries | Curtis Industries | Curtis Industries | Curtis Industries |
| Series | O | O | O | O |
| Packaging | Bulk | Bulk | Bulk | Bulk |
| Product Status | Active | Active | Active | Active |
| Terminal Block Type | Barrier Block | Barrier Block | Barrier Block | Barrier Block |
| Number of Circuits | 2 | 4 | 1 | 3 |
| Number of Wire Entries | 4 | 8 | 2 | 6 |
| Pitch | 1.860" (47.24mm) | 1.860" (47.24mm) | - | 1.860" (47.24mm) |
| Number of Rows | 2 | 2 | 2 | 2 |
| Current Rating (Amps) | 125A | 125A | 125A | 125A |
| Voltage Rating | 600V | 600V | 600V | 600V |
| Wire Gauge | 1/0 AWG | 1/0 AWG | 1/0 AWG | 1/0 AWG |
| Top Termination | Screws | Screws | Screws | Screws |
| Bottom Termination | Closed | Closed | Closed | Closed |
| Barrier Type | 2 Wall (Dual) | 2 Wall (Dual) | 2 Wall (Dual) | 2 Wall (Dual) |
| Features | Flange | Flange | Flange | Flange |
| Color | - | - | - | - |
The following parts include "O-4" in Silicon Labs O-4.
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