The Siemens 3WT8121-6AA04-5AB2 is a SENTRON 3WT8 withdrawable Air Circuit Breaker (ACB) designed for high-current low-voltage power distribution and protection applications. This configuration is a 3-pole, Size 1 circuit breaker with a rated current of 1250 A, suitable for AC systems up to 500 V at 50/60 Hz. The specified ultimate short-circuit breaking capacity (Icu) is 66 kA at 500 V AC. The exact MLFB configuration is documented as a withdrawable breaker with guide frame, mechanical lockout, tripped signalling and indicators.
The 3WT8121-6AA04-5AB2 is a manual draw-out (MDO) circuit breaker with a withdrawable design and guide frame. This arrangement is particularly useful in industrial switchboards where breaker isolation, inspection, servicing and replacement need to be performed efficiently according to the applicable operating procedures. Current Siemens pricing documentation also identifies 3WT8121-6AA04-5AB2 as the 1250 A, MDO, withdrawable configuration with guide frame.
The breaker incorporates the ETU37WT LSING electronic overcurrent release with display, providing electronic protection for applicable overload, short-circuit and earth-fault conditions. The protection settings are configurable according to the breaker configuration and the requirements of the electrical protection and coordination study.
Its 1250 A current rating makes it suitable for demanding power-distribution applications including main incomers, high-capacity feeders, busbar sections and industrial switchboards. The 66 kA Icu at 500 V AC provides high short-circuit interruption capability for suitable systems with corresponding fault levels.
The configuration includes a mechanical lockout device, tripped signalling switch, tripped indicators and guide frame. It also uses a manual operating mechanism with stored-energy memory and includes a 2-piece shutter with sealing cap against unauthorized switching off and a door sealing frame, according to the product data sheet for this exact MLFB.
| Specification | Details |
|---|---|
| Product | Siemens 3WT8121-6AA04-5AB2 |
| Product Type | Withdrawable Air Circuit Breaker |
| Series | SENTRON 3WT8 |
| Configuration | 3-Pole |
| Frame Size | Size 1 |
| Rated Current (In) | 1250 A |
| Rated Voltage | Up to 500 V AC |
| Frequency | 50/60 Hz |
| Ultimate Breaking Capacity (Icu) | 66 kA at 500 V AC |
| Short-Time Current Strength (Icw) | 66 kA/S |
| Overcurrent Release | ETU37WT LSING with display |
| Operating Type | Manual Draw-Out (MDO) |
| Design | Withdrawable with Guide Frame |
| Mechanical Lockout | Included |
| Tripped Signalling Switch | Included |
| Tripped Indicators | Included |
| Shutter | 2-piece shutter with sealing cap |
| Application | High-current low-voltage power distribution |
Siemens 3WT8121-6AA04-5AB2
SENTRON 3WT8 Air Circuit Breaker
1250 A rated current
3-pole configuration
Size 1
Manual draw-out (MDO) operating design
Withdrawable construction with guide frame
Rated for applications up to 500 V AC
50/60 Hz AC operation
66 kA Icu at 500 V AC
66 kA/S short-time current strength
ETU37WT LSING electronic overcurrent release with display
Overload, short-circuit and earth-fault protection configuration
Mechanical lockout device
Tripped signalling switch
Tripped indicators
Manual operating mechanism with memory
2-piece shutter with sealing cap
Door sealing frame
Suitable for professional low-voltage power distribution
The Siemens 3WT8121-6AA04-5AB2 1250A 3-pole withdrawable ACB can be considered for:
Main low-voltage switchboards
Main incomer applications
Industrial power distribution
High-current feeder protection
Generator distribution systems
Large manufacturing plants
Process industries
Commercial building main distribution
Electrical substations and distribution sections
Busbar protection and switching
Infrastructure power systems
OEM switchgear assemblies
Critical power-distribution systems
Industrial automation power sections
High-capacity electrical panels
The 1250 A rated current makes the 3WT8121-6AA04-5AB2 suitable for high-capacity low-voltage electrical distribution systems. It can handle substantial electrical loads in main incomer, feeder and distribution applications when correctly matched with the system design.
The 66 kA Icu at 500 V AC provides a high level of short-circuit interruption capability for suitable high-fault-level installations. The prospective short-circuit current at the installation point should always be checked against the breaker rating before selection.
The withdrawable design with guide frame provides operational flexibility for switchboards where maintenance, inspection and breaker servicing are important. The manual draw-out arrangement allows the breaker to be withdrawn according to the prescribed switchgear operating procedure.
The ETU37WT LSING electronic overcurrent release with display provides microprocessor-based protection for overload, short-circuit and earth-fault conditions. This allows protection settings to be coordinated with the wider electrical distribution system.
The 3-pole construction provides coordinated protection and switching for compatible three-phase AC distribution systems. This makes the breaker suitable for industrial switchboards, high-capacity feeders, generator systems and other three-phase power-distribution applications.
The mechanical lockout device provides an additional control and safety function for suitable switchgear operating procedures. It can help prevent unintended breaker operation during defined maintenance or isolation activities.
The tripped signalling switch and tripped indicators provide useful breaker-status information for operators and maintenance personnel. These functions can simplify identification of a tripped breaker and support troubleshooting in industrial power-distribution systems.
The 2-piece shutter with sealing cap and door sealing frame supports controlled switchgear access and helps prevent unauthorized switching or access to the breaker compartment according to the configured installation arrangement.
The Siemens SENTRON 3WT8 platform is designed for professional low-voltage power-distribution applications. This makes the 3WT8121-6AA04-5AB2 suitable for OEMs, EPC contractors, panel builders, electrical contractors, system integrators and industrial maintenance teams.
For customers sourcing Siemens high-capacity ACBs across Faridabad, Delhi NCR, Noida, Gurgaon/Gurugram, Ghaziabad, Punjab, Mumbai, Pune, Ahmedabad, Hyderabad, Bengaluru/Bangalore, Chennai, Kolkata, Jaipur, Chandigarh, Ludhiana and other major industrial locations across India, this 1250 A withdrawable ACB can be considered for suitable projects.
Before installation or replacement, verify the complete MLFB configuration, rated voltage, prospective fault current, ETU settings, guide-frame compatibility, busbar arrangement, protection coordination and switchboard dimensions.
SB Smart supplies Siemens circuit breakers, ACBs, switchgear and industrial electrical products for OEMs, EPC contractors, panel builders, electrical contractors, system integrators and industrial maintenance teams across India.
The Siemens 3WT8121-6AA04-5AB2 1250A 3-pole withdrawable ACB is suitable for customers looking for high-capacity Siemens circuit protection for main distribution boards, industrial switchboards, generator systems, high-current feeders 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 3WT8121-6AA04-5AB2?
It is a Siemens SENTRON 3WT8 withdrawable Air Circuit Breaker with a 3-pole configuration, Size 1 and 1250 A rated current.
2. What is the rated current?
The rated current is 1250 A.
3. What is the short-circuit breaking capacity?
The specified Icu is 66 kA at 500 V AC. The available product documentation also specifies 66 kA/S short-time current strength.
4. What is the rated voltage?
The breaker is specified for applications up to 500 V AC at 50/60 Hz.
5. Is this circuit breaker withdrawable?
Yes. The 3WT8121-6AA04-5AB2 is a manual draw-out withdrawable circuit breaker supplied with a guide frame.
6. What type of trip unit does it use?
It uses the ETU37WT LSING electronic overcurrent release with display, with protection for overload, short circuit and earth fault according to the configuration.
7. What safety and indication features are included?
The specified configuration includes a mechanical lockout device, tripped signalling switch, tripped indicators, guide frame, shutter with sealing cap and door sealing frame.
8. Where can this ACB be used?
It can be considered for suitable main switchboards, industrial power distribution, high-current feeders, generator distribution systems, large electrical panels, infrastructure projects and critical power-distribution applications.
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| 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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