The Siemens 3WT8121-6UA34-5AB2 is a SENTRON 3WT8 series Air Circuit Breaker (ACB) designed for high-capacity low-voltage power distribution systems. It provides reliable protection against overload, short-circuit, and earth fault conditions, making it suitable for critical industrial applications such as PCC, MCC, and main incoming feeders.
This model is a 1250A, 3-pole withdrawable type ACB with an advanced electronic protection unit (ETU37WT LSING), ensuring precise protection and monitoring for modern electrical networks.
• Siemens SENTRON 3WT8 series ACB
• Part Number: 3WT8121-6UA34-5AB2
• 3 Pole configuration
• Rated current: 1250A
• Breaking capacity: 66kA @ 500V AC
• Withdrawable (draw-out) type design
• Protection unit: ETU37WT LSING (Electronic trip system)
• Protection functions: Overload, Short circuit, Earth fault
• Motorized/manual operating mechanism with stored energy system
• Mechanical lockout and tripped indication system
• High short-time withstand capability (ICW 66kA/s)
• IEC 60947-2 compliant design
• Industrial-grade durability for continuous operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens SENTRON 3WT8 |
| Part Number | 3WT8121-6UA34-5AB2 |
| Product Type | Air Circuit Breaker (ACB) |
| Number of Poles | 3 Pole |
| Rated Current | 1250A |
| Rated Voltage | Up to 500V AC |
| Breaking Capacity (Icu) | 66kA @ 500V AC |
| Protection Unit | ETU37WT LSING |
| Protection Functions | Overload, Short Circuit, Earth Fault |
| Type | Withdrawable / Draw-out |
| Frequency | 50/60 Hz |
| Mounting Type | Fixed base with draw-out mechanism |
| Standard | IEC 60947-2 |
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