The Siemens 8US1313-4AH03 is a device adapter for a molded-case circuit breaker (MCCB) from the SENTRON 8US1 busbar system. It offers a 4-pole configuration rated at 250 A and is designed to interface with the 3VA12 series circuit breakers.
The 8US1313-4AH03 adapter is used in industrial distribution and switchgear installations to adapt a 3VA12 MCCB into the 8US1 busbar system. It provides robust 250 A current handling, a 4-pole layout for full three-phase plus neutral connection, and compatibility with compact panel layouts requiring 60 mm busbar spacing.
| Busbar distance | 60 mm |
| Max. busbar thickness | 10 mm |
| Min. busbar thickness | 5 mm |
| Rated current In | 250 A |
| Width of the adapter | 140 mm |
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