The Siemens 3WT8121-6AA04-5AB2 is a high-performance Air Circuit Breaker (ACB) from the SENTRON 3WT8 series, designed for heavy-duty low-voltage power distribution. It provides reliable protection and switching for large electrical systems, ensuring safety against overload, short circuit, and earth fault conditions in industrial environments.
This model is a withdrawable type ACB with a 1250A rated current, making it suitable for critical power applications such as MCC, PCC, and main incoming feeders in industrial plants.
• Siemens SENTRON 3WT8 series Air Circuit Breaker
• Part Number: 3WT8121-6AA04-5AB2
• 3 Pole configuration
• Rated current: 1250A
• Breaking capacity: up to 66kA @ 500V AC
• Withdrawable (draw-out) type construction
• Advanced LSING electronic protection unit (ETU37WT)
• Protection functions: Overload, Short circuit, Ground fault
• High short-time withstand strength (ICW 66kA/s)
• Mechanical lockout & tripped indication system
• Door sealing frame for safety
• Manual operating mechanism with stored energy system
• IEC 60947-2 compliant design
• Designed for industrial-grade power distribution systems
| Parameter | Specification |
|---|---|
| Product Series | Siemens SENTRON 3WT8 |
| Part Number | 3WT8121-6AA04-5AB2 |
| Product Type | Air Circuit Breaker (ACB) |
| Number of Poles | 3 Pole |
| Rated Current (In) | 1250A |
| Rated Voltage | Up to 500V AC |
| Breaking Capacity (Icu) | 66kA @ 500V AC |
| Protection Unit | ETU37WT LSING |
| Protection Functions | L (Overload), S (Short), I (Instantaneous), N (Neutral), G (Earth fault) |
| Type | Withdrawable / Draw-out |
| Operating Frequency | 50/60 Hz |
| Mounting Type | Fixed base with withdrawable breaker |
| Standard | IEC 60947-2 |
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