Siemens 6SE9212-8BA40

Siemens 6SE9212-8BA40 MICROMASTER MM55 — Reliable Variable Speed Drive

The Siemens 6SE9212-8BA40 MICROMASTER MM55 is a robust variable frequency drive designed for reliable motor control in demanding industrial environments. Featuring a built-in Class A filter for reduced electrical interference, this compact inverter ensures smooth performance for constant torque applications. Its compact footprint and flexible configuration make it an excellent choice for machine builders, OEMs, and maintenance engineers looking for a proven, cost-effective drive.

Power & Performance

This MICROMASTER MM55 model operates on 1AC 208–240V ±10% at 50/60Hz, delivering constant torque with a 0.55 kW rating. It supports an overload capacity of 150% for 60 seconds, allowing it to handle demanding start-up conditions and load variations. Engineered for reliability, it provides precise motor speed regulation and enhanced process control, ensuring consistent performance in automation systems.

Compact & Efficient Design

With dimensions of 175 x 73 x 141 mm (H x W x D), this drive is space-efficient and ideal for control cabinets with limited room. The IP20 protection rating ensures safety in standard industrial environments while offering adequate ventilation. Its built-in EMC filter (Class A) minimizes electrical noise, ensuring compliance and stable operation in networked environments.

Durability in Harsh Conditions

The drive operates in ambient temperatures from 0°C to 50°C, making it suitable for most factory-floor conditions. Its rugged design helps maintain reliability under continuous operation, reducing downtime and maintenance costs. By combining Siemens engineering quality with a compact, lightweight design, this drive provides long-term value for industrial users.

Key Applications

The Siemens 6SE9212-8BA40 is ideal for constant torque applications where reliability and precision are essential. Everyday use cases include conveyors, pumps, fans, and small machine tool applications. For facilities running legacy Siemens MICROMASTER equipment, this drive is a drop-in replacement part that extends the life of existing installations.

Warranty & Availability

MRO Electric and Supply offers this Siemens MICROMASTER MM55 with a 2-year warranty, free shipping, and immediate availability. Customers can order confidently knowing that both performance and service reliability are guaranteed.

Frequently Asked Questions

Is the Siemens 6SE9212-8BA40 MICROMASTER MM55 still in production?

This is a legacy model, but MRO stocks it with a warranty and immediate availability.

What input voltage does this drive support?

It operates on single-phase 208–240V AC with ±10% tolerance at 50/60Hz.

What is the motor power rating?

This model delivers a constant torque rating of 0.55 kW.

Does it have overload protection?

Yes, it provides 150% overload capacity for up to 60 seconds.

What applications is it suited for?

It's ideal for conveyors, pumps, small machine tools, and other constant torque machinery.

What is the size of the unit?

The compact dimensions are 175 x 73 x 141 mm (H x W x D).

What is the protection class?

It has an IP20 protection rating.

Can it handle variable torque applications?

No — this specific model is configured for constant torque use only.

What is the operating temperature range?

It is designed for environments between 0°C and 50°C.

Does it include a filter?

Yes — a built-in Class A filter for reduced electromagnetic interference.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry AC Drives from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About the 6SE9212-8BA40

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6SE9212-8BA40, take a look at more from our AC Drives line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 6SE9212-8BA40 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.