The Siemens 3WT8121-6UN34-5AB2 is a SENTRON 3WT8 series Air Circuit Breaker (ACB) designed for high-capacity low-voltage power distribution systems. It is used to protect and control electrical networks against overload, short-circuit, and earth fault conditions, making it suitable for critical industrial applications.
This model belongs to the 1250A, 3-pole withdrawable ACB category, engineered for use in PCC, MCC, generator incomer/outgoing feeders, and large industrial distribution systems.
• Siemens SENTRON 3WT8 series Air Circuit Breaker
• Part Number: 3WT8121-6UN34-5AB2
• 3 Pole configuration
• Rated current: 1250A
• Breaking capacity: 66kA @ 500V AC (series dependent)
• Withdrawable (draw-out) type design
• Advanced electronic protection unit: ETU37WT LSING
• Protection functions: Overload, Short circuit, Earth fault
• Motorized/manual operating mechanism with stored energy system
• Mechanical lockout and trip indication system
• Auxiliary contacts and shunt release options (variant dependent)
• IEC 60947-2 compliant design
• High short-time withstand capability (industrial grade performance)
| Parameter | Specification |
|---|---|
| Product Series | Siemens SENTRON 3WT8 |
| Part Number | 3WT8121-6UN34-5AB2 |
| Product Type | Air Circuit Breaker (ACB) |
| Number of Poles | 3 Pole |
| Rated Current | 1250A |
| Rated Voltage | Up to 500V AC |
| Breaking Capacity | 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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