The Siemens 3WT8121-6UA34-5BC2 is a SENTRON 3WT8 series Air Circuit Breaker (ACB) designed for high-capacity low-voltage power distribution systems. It is used for reliable protection and switching of electrical networks against overload, short circuit, and earth fault conditions in industrial and commercial installations.
This model belongs to the 1250A, 3-pole withdrawable ACB category, built for critical applications such as PCC panels, MCC panels, transformer incomer/outgoing feeders, and generator protection systems.
• Siemens SENTRON 3WT8 series Air Circuit Breaker
• Part Number: 3WT8121-6UA34-5BC2
• 3 Pole configuration
• Rated current: 1250A
• Breaking capacity: 66kA @ 500V AC
• Withdrawable (draw-out) type design
• Advanced electronic protection unit (ETU37WT LSING family)
• Protection functions: Overload, Short circuit, Earth fault
• High short-time withstand strength (ICW up to 66kA/s class)
• Motorized / manual operating mechanism with stored energy system
• Mechanical lockout and tripped indication system
• Modular construction for easy maintenance
• IEC 60947-2 compliant design
• Industrial-grade durability for continuous operation
| Parameter | Specification |
|---|---|
| Product Series | Siemens SENTRON 3WT8 |
| Part Number | 3WT8121-6UA34-5BC2 |
| 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 | 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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