The Siemens 3WT8105-8KW68-5BC2 is specified as a SENTRON 3WT8 withdrawable Air Circuit Breaker (ACB) for high-current low-voltage power distribution applications. Based on the product details provided, this configuration is a 4-pole, Size 1 circuit breaker with a rated current of 1000 A, suitable for 500 V AC at 50/60 Hz, with an Icu of 66 kA at 500 V.
Siemens documentation confirms that the 3WT8 Size 1, 1000 A range is available as a 4-pole withdrawable breaker with 66 kA short-circuit breaking capacity and 50 kA short-time withstand capability at 500 V.
The withdrawable construction with guide frame is intended for switchboards where breaker removal and servicing are important. This arrangement allows the breaker to be withdrawn from the connected position according to the prescribed switchgear operating procedure, making it suitable for industrial distribution boards and other installations where maintenance access is required.
The configuration specified includes a mechanical lockout device, tripped signalling switch and tripped indicators. These features support breaker status monitoring and controlled operating procedures within the switchboard.
Important: I could not find a publicly indexed Siemens page or datasheet for the exact MLFB 3WT8105-8KW68-5BC2, so I have not invented the exact protection-release or control-voltage details represented by the 8KW68 portion of the code. Siemens documentation does confirm the underlying 3WT8105 1000 A, Size 1, 4-pole withdrawable family and its electrical ratings.
| Specification | Details |
|---|---|
| Product | Siemens 3WT8105-8KW68-5BC2 |
| Product Type | Withdrawable Air Circuit Breaker |
| Series | SENTRON 3WT8 |
| Configuration | 4-Pole |
| Frame Size | Size 1 |
| Rated Current (In) | 1000 A |
| Operating Voltage | Up to 500 V AC |
| Frequency | 50/60 Hz |
| Ultimate Breaking Capacity (Icu) | 66 kA at 500 V AC |
| Short-Time Withstand Capability | 50 kA |
| Construction | Withdrawable |
| Guide Frame | Included as specified |
| Mechanical Lockout | Included as specified |
| Tripped Signalling Switch | Included as specified |
| Tripped Indicators | Included as specified |
The 3WT8 technical catalogue lists the Size 1, 1000 A range at 66 kA Icu and 50 kA Icw at 500 V, including 4-pole withdrawable versions.
The Siemens 3WT8105-8KW68-5BC2 1000A 4-pole withdrawable ACB can be considered for:
The 1000 A rated current makes this Siemens 3WT8 ACB suitable for high-capacity low-voltage distribution systems where substantial loads require reliable switching and protection.
The 66 kA Icu at 500 V AC provides high short-circuit interruption capability for suitable high-fault-level installations. The actual prospective short-circuit current must be checked at the installation point before final breaker selection. Siemens documentation confirms 66 kA Icu at 500 V for the relevant 3WT8 Size 1, 1000 A family.
The 4-pole construction provides coordinated protection and switching for compatible four-pole systems. This can be useful where the neutral conductor also needs to be switched according to the electrical system design.
The withdrawable design with guide frame provides greater service flexibility than a fixed-mounted arrangement. It can be useful in industrial switchboards where inspection, maintenance and controlled isolation of the breaker are important.
The mechanical lockout device supports controlled breaker operation and can be used as part of defined maintenance and safety procedures.
The tripped signalling switch and tripped indicators provide breaker-status information that can assist operators and maintenance personnel during fault investigation and system restoration.
The Siemens 3WT8 platform is intended for professional low-voltage power-distribution applications, making this ACB relevant for OEMs, EPC contractors, panel builders, electrical contractors, system integrators and industrial maintenance teams.
The Siemens 1000A 4P 66kA withdrawable ACB can be considered for suitable projects across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Ghaziabad, Punjab, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Kolkata, Jaipur, Chandigarh, Ludhiana and other major industrial and commercial locations across India.
Before installation or replacement, verify the complete MLFB, protection-release configuration, control voltage, guide-frame compatibility, busbar connection arrangement, fault level and switchboard dimensions.
SB Smart supplies Siemens ACBs, circuit breakers, switchgear and industrial electrical products for OEMs, EPC contractors, panel builders, electrical contractors, system integrators and industrial maintenance teams across India.
The Siemens 3WT8105-8KW68-5BC2 1000A 4-pole withdrawable ACB is suitable for customers looking for high-capacity Siemens circuit protection for main distribution boards, industrial switchboards, high-current feeders, generator systems and infrastructure power-distribution applications.
SB Smart supports Siemens product sourcing across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Kolkata, Chandigarh, Ludhiana and other major Indian industrial markets.
1. What is Siemens 3WT8105-8KW68-5BC2?
It is a Siemens SENTRON 3WT8 withdrawable Air Circuit Breaker, specified as a 4-pole, Size 1, 1000 A breaker.
2. What is the rated current?
The rated current is 1000 A.
3. What is the short-circuit breaking capacity?
For the relevant 3WT8 Size 1, 1000 A family, the specified Icu is 66 kA at 500 V AC.
4. What is the short-time withstand capability?
The relevant 3WT8 catalogue data specifies 50 kA short-time withstand capability at 500 V for this size/rating family.
5. Is this circuit breaker withdrawable?
Yes. The product specification identifies it as a withdrawable circuit breaker with guide frame.
6. How many poles does it have?
The specified configuration is 4-pole (4P).
7. What indication and safety features are specified?
The supplied description includes a mechanical lockout device, tripped signalling switch and tripped indicators.
8. Where can this ACB be used?
It can be considered for suitable main switchboards, industrial power distribution, high-current feeders, generator systems, large electrical panels and infrastructure power-distribution applications.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SENTRON 3WT8 |
| Part Number | 3WT8105-8KW68-5BC2 |
| Product Type | Air Circuit Breaker (ACB) |
| Number of Poles | 4 Pole |
| Rated Current (In) | 1000A |
| Frame Size | Size 1 |
| Breaking Capacity (Icu) | Up to 66 kA @ 500V AC (platform dependent) |
| Short-Time Withstand (Icw) | Up to 66 kA/s |
| Trip Unit | ETU-based electronic protection (LSING depending on variant) |
| Protection | Overload, Short Circuit, Instantaneous, Earth Fault |
| Rated Voltage (Ue) | Up to 500V AC |
| Insulation Voltage (Ui) | 1000V |
| Frequency | 50/60 Hz |
| Mounting Type | Withdrawable / Draw-out |
| Operating Mechanism | Manual + Motorized stored energy |
| Standard | IEC 60947-2 |
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