Siemens 3WT8121-6AA06-5AB2 1250A 3-Pole Withdrawable Air Circuit Breaker 66kA

The Siemens 3WT8121-6AA06-5AB2 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, with a specified ultimate short-circuit breaking capacity (Icu) of 66 kA at 500 V AC.

The 3WT8121-6AA06-5AB2 features a withdrawable construction with guide frame, making it suitable for switchboards where maintenance accessibility, controlled isolation and convenient breaker handling are important. The withdrawable arrangement allows the circuit breaker to be moved between its operating and withdrawn positions as part of the applicable switchgear operating procedure.

The 1250 A rated current makes this Siemens 3WT8 ACB suitable for demanding power-distribution applications such as main incomers, feeders and high-capacity industrial distribution sections. Proper coordination with conductors, busbars, upstream and downstream protective devices and the system short-circuit level is essential.

With an Icu of 66 kA at 500 V AC, the breaker is intended for installations with high prospective short-circuit levels, subject to the applicable Siemens ratings and installation conditions. The actual fault current at the installation point should always be evaluated before selecting the breaker. Siemens 3WT8 documentation identifies the Standard range with 66 kA interruption capability at 500 V AC.

The product configuration also includes a mechanical lockout device, tripped signaling switch and tripped indicators, providing useful status and operational functions for industrial switchgear. These features can support controlled operation, troubleshooting and maintenance procedures.

Technical Specifications

Key Features

• Siemens 3WT8121-6AA06-5AB2
• SENTRON 3WT8 Air Circuit Breaker
• 1250 A rated current
• 3-pole configuration
• Size 1
• Withdrawable circuit-breaker design
• Guide frame included
• Rated for applications up to 500 V AC
• 50/60 Hz AC operation
• 66 kA Icu at 500 V AC
• Mechanical lockout device
• Tripped signaling switch
• Tripped indicators
• Designed for high-capacity electrical distribution
• Suitable for industrial switchboards
• Suitable for main incomer and feeder applications
• Designed for professional low-voltage power protection

Applications

The Siemens 3WT8121-6AA06-5AB2 1250A 3-pole withdrawable ACB can be considered for:

• Main low-voltage switchboards
• Main incomer applications
• Industrial power distribution
• High-current feeder protection
• Manufacturing plants
• Large industrial facilities
• Commercial building power distribution
• Generator distribution systems
• Infrastructure power systems
• Electrical substations
• Process industries
• OEM switchgear assemblies
• Critical power-distribution systems
• Industrial automation power systems
• High-capacity electrical panels

Benefits

The 1250 A rated current makes the 3WT8121-6AA06-5AB2 suitable for high-capacity low-voltage power-distribution systems. It can be used in applications where substantial electrical loads need controlled switching and reliable protection.

The 66 kA Icu at 500 V AC provides high short-circuit interruption capability for appropriately designed installations. This is particularly relevant to industrial switchboards and high-fault-level distribution systems. Siemens documentation lists the 3WT8 Standard range with maximum interruption capability of 66 kA at 500 V AC.

The withdrawable construction with guide frame is useful where breaker removal, inspection and maintenance are important. Compared with permanently installed arrangements, withdrawable switchgear can provide greater operational flexibility for maintenance and equipment servicing when used according to the manufacturer's procedures.

The 3-pole configuration provides coordinated switching and protection for compatible three-phase AC systems. This makes the breaker suitable for industrial distribution boards, feeder sections and other high-current three-phase applications.

The mechanical lockout device provides an additional operational safety function for suitable switchgear arrangements. It can help prevent or control breaker operation during maintenance and other defined operating procedures.

The tripped signaling switch and tripped indicators provide useful breaker-status information. These functions can help operators and maintenance personnel identify that the breaker has reached a tripped state and support troubleshooting within the switchgear control scheme.

The Siemens 3WT8 series is designed for professional low-voltage power-distribution applications, making this breaker suitable for OEMs, EPC contractors, panel builders, system integrators, electrical contractors 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 markets across India, the 3WT8121-6AA06-5AB2 can be considered for suitable switchgear applications.

Always verify the complete MLFB configuration, rated voltage, fault level, protection-release configuration, guide-frame compatibility, busbar arrangement and control requirements before installation or replacement.

Why Buy Siemens 3WT8121-6AA06-5AB2 from SB Smart?

SB Smart supplies Siemens circuit breakers, ACBs, switchgear accessories and industrial electrical products for OEMs, EPC contractors, panel builders, electrical contractors, system integrators and industrial maintenance teams across India.

The Siemens 3WT8121-6AA06-5AB2 1250A 3-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.

FAQs

1. What is Siemens 3WT8121-6AA06-5AB2?
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.

4. What is the rated voltage?
The stated application rating is up to 500 V AC at 50/60 Hz.

5. Is this circuit breaker withdrawable?
Yes. The specified configuration is a withdrawable circuit breaker with guide frame.

6. How many poles does it have?
The 3WT8121-6AA06-5AB2 is a 3-pole (3P) ACB.

7. What indication and safety features are included?
The specified configuration includes a mechanical lockout device, tripped signaling 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 distribution, infrastructure projects and large electrical panels.