© Siemens AG
MICROMASTER 420
Basic Siemens MICROMASTER 4 converter from 0.12 kW to 11 kW with V/f control; Siemens has cancelled it and points to SINAMICS G120C as the replacement
Price and delivery time are given after a technical review.
Production status: Discontinued
Siemens has cancelled this family. In the product record of every MICROMASTER 420 article number we checked, 'Phase Out Announce' is dated 1 October 2017 and 'Prod. Cancellation' 1 October 2019, and the item is called a 'spare part'. Siemens support entry 109746454 (February 2020) says the product can still be ordered although the type is cancelled; so this is not a new device but a spare part for installed machines. The next lifecycle stage has no date yet and no end date for spare-part supply appears in the Siemens sources we read; ask Siemens before relying on it for a new design or for stock. Siemens' suggested replacement is SINAMICS G120C for 3-phase 400 V input, the modular SINAMICS G120 for 1- or 3-phase 230 V input, and SINAMICS V20 for small ratings. Siemens itself calls the compatibility of SINAMICS with MICROMASTER 4 'restricted': the replacement is not a drop-in and needs an engineering check and recommissioning.
Checked on Nov 2, 2026
A suggested successor is not an exact equivalent; the right model depends on your application.
The MICROMASTER 420 is the simplest member of Siemens' MICROMASTER 4 generation: a one-piece converter for speed control of three-phase motors which, according to Siemens' own operating instructions, is suited to a wide range of simple motor-control tasks with its factory settings and can be tuned through parameters for more demanding ones. It works stand-alone or integrated into an automation system.
In the Siemens product record (SiePortal / Industry Mall) of every MICROMASTER 420 article number we checked, 'Phase Out Announce' is dated 1 October 2017 and 'Prod. Cancellation' 1 October 2019, and the item is described as a 'spare part'. Siemens support entry 109746454 (February 2020) says the product can still be ordered although the type is cancelled. In other words this converter is no longer a new device in Siemens' sales range and is offered as a spare part for installed machines.
The later lifecycle stages (Prod. Discont. and End Prod. Lifecycl.) have no date yet, but no end date for spare-part supply appears in the Siemens sources we read either. For a new design or for stocking, look at the replacement first.
Siemens' migration brochure states that it has decided to replace MICROMASTER with drives from the current SINAMICS family. For the MICROMASTER 420 the brochure (07/2022) shows these routes: 3-phase 400 V input to SINAMICS G120C, 1- or 3-phase 230 V input to the modular SINAMICS G120, and SINAMICS V20 for small ratings. Siemens also says SINAMICS offers 'restricted compatibility' with MICROMASTER 4, so the replacement is not a drop-in: it needs an engineering check and recommissioning.
0.12 kW to 11 kW in three input classes: 1-phase 200 to 240 V (up to 3 kW), 3-phase 200 to 240 V (up to 5.5 kW) and 3-phase 380 to 480 V (0.37 kW to 11 kW). Three frame sizes, A, B and C. The power section uses IGBTs with pulse width modulation and the output frequency goes up to 650 Hz. Control is V/f only; there is no vector control.
| Model | Order code | Code type | Attributes | Request |
|---|---|---|---|---|
| MICROMASTER 420, 0.12 kW, 1/3 AC 200 … 240 Vبدون فیلتر؛ کوچکترین مدل خانواده، ابعاد ۱۷۳ × ۷۳ × ۱۴۹ میلیمتر (ارتفاع × عرض × عمق) | 6SE6420-2UC11-2AA1 | Exact code |
| Request MICROMASTER 420, 0.12 kW, 1/3 AC 200 … 240 V |
| MICROMASTER 420, 0.55 kW, 1 AC 200 … 240 V, Class A filterورودی یکفاز با فیلتر Class A داخلی | 6SE6420-2AB15-5AA1 | Exact code |
| Request MICROMASTER 420, 0.55 kW, 1 AC 200 … 240 V, Class A filter |
| MICROMASTER 420, 1.5 kW, 3 AC 380 … 480 Vبدون فیلتر؛ نمونهٔ خود Siemens در بروشور مهاجرت، که برای آن SINAMICS G120C با کد 6SL3210-1KE15-8UB2 پیشنهاد شده است | 6SE6420-2UD21-5AA1 | Exact code |
| Request MICROMASTER 420, 1.5 kW, 3 AC 380 … 480 V |
| MICROMASTER 420, 2.2 kW, 3 AC 380 … 480 Vبدون فیلتر؛ ابعاد ۲۰۲ × ۱۴۹ × ۱۷۲ میلیمتر (ارتفاع × عرض × عمق) | 6SE6420-2UD22-2BA1 | Exact code |
| Request MICROMASTER 420, 2.2 kW, 3 AC 380 … 480 V |
| MICROMASTER 420, 5.5 kW, 3 AC 380 … 480 Vبدون فیلتر؛ ابعاد ۲۴۵ × ۱۸۵ × ۱۹۵ میلیمتر (ارتفاع × عرض × عمق) | 6SE6420-2UD25-5CA1 | Exact code |
| Request MICROMASTER 420, 5.5 kW, 3 AC 380 … 480 V |
| MICROMASTER 420, 11 kW, 3 AC 380 … 480 Vبدون فیلتر؛ بزرگترین مدل خانواده | 6SE6420-2UD31-1CA1 | Exact code |
| Request MICROMASTER 420, 11 kW, 3 AC 380 … 480 V |
| Power rangePower range | 0.12 … 11 kW |
|---|---|
| Voltage familiesVoltage families | 1 AC 200 … 240 V, 3 AC 200 … 240 V, 3 AC 380 … 480 V |
| Line voltage (400 V class)Line voltage (400 V class) | 380 … 480 ±10 % V AC |
| Line frequencyLine frequency | 47 … 63 Hz |
| Output frequencyOutput frequency | 0 … 650 Hz |
| Degree of protectionDegree of protection | IP20 |
| Power section technologyPower section technology | IGBT, PWM |
| Overload capability (constant torque)Overload capability (constant torque) | 150 % for 60 s, within 5 min |
| Operating temperatureOperating temperature | -10 … +50 °C |
| Frame sizesFrame sizes | A, B, C |
| Control methodControl method | V/f (linear, linear with FCC, quadratic, multi-point); PI controller |
|---|---|
| Pulse frequencyPulse frequency | 2 … 16 (2 kHz steps) kHz |
| Inputs and outputsInputs and outputs | 3 digital in, 1 analog in (0 … 10 V), 1 relay out, 1 analog out (0 … 20 mA) |
| BrakingBraking | DC braking, compound braking |
| Serial interfaceSerial interface | RS-485 (USS), RS-232 optional |
|---|---|
| Fieldbus option moduleFieldbus option module | PROFIBUS DP |
| CANopen option moduleCANopen option module | CANopen |
| Commissioning softwareCommissioning software | DriveMonitor, STARTER |
|---|---|
| Operator panelsOperator panels | SDP (standard), BOP, AOP (options) |
| Delivery release (article 6SE6420-2UD21-5AA1)Delivery release (article 6SE6420-2UD21-5AA1) | 2003-02-15 |
|---|---|
| Phase-out announcedPhase-out announced | 2017-10-01 |
| Product cancellationProduct cancellation | 2019-10-01 |
| Current status in SiePortalCurrent status in SiePortal | Prod. Cancellation, spare part |
Basic Operator Panel (BOP), 6SE6400-0BP00-0AA1
MICROMASTER 4 basic operator panel; Siemens lists it as a spare part with 'Prod. Cancellation' from 2019
Advanced Operator Panel (AOP), 6SE6400-0AP00-0AA1
Advanced operator panel; it has no direct counterpart in the G120, which uses the BOP-2 or IOP instead (per Siemens' MM440 migration guide)
PROFIBUS module, 6SE6400-1PB00-0AA0
Optional PROFIBUS DP communication module; 'Prod. Cancellation' from 2019
CANopen module, 6SE6400-1CB00-0AA0
Optional CANopen module for the MM420, MM430 and MM440; 'Prod. Cancellation' from 2019
DeviceNet module, 6SE6400-1DN00-0AA0
Optional DeviceNet module; 'Prod. Cancellation' from 2019. The G120 has no direct replacement for it (per Siemens' MM440 migration guide)
PC to inverter connection kit, 6SE6400-1PC00-0AA0
Kit to connect a PC to the converter for DriveMonitor and STARTER; 'Prod. Cancellation' from 2019
BOP/AOP door mounting kit, 6SE6400-0PM00-0AA0
Kit for mounting the operator panel in the cabinet door for a single converter; 'Prod. Cancellation' from 2019
EMC filters, line commutating choke, output choke, LC filter, gland plate
Device-dependent options per the Options chapter of the operating instructions: Class A and B EMC filters, line commutating choke, output choke, LC filter and gland plate. With an output choke or LC filter only a 4 kHz pulse frequency is permitted
Other
Alternative SINAMICS G products for MICROMASTER 4 (Siemens support entry)
Alternative SINAMICS G products for MICROMASTER 4 (Siemens support entry)
Language: English · Version 02/2020
Brochure
Simply switch over now from MICROMASTER to SINAMICS (brochure)
Simply switch over now from MICROMASTER to SINAMICS (brochure)
Language: English · Version 07/2022
Manual
MICROMASTER 420 0.12 kW - 11 kW Operating Instructions
MICROMASTER 420 0.12 kW - 11 kW Operating Instructions
Language: English · Version 10/06
Manual
MICROMASTER 420 0.12 kW - 11 kW Operating Instructions (Compact)
MICROMASTER 420 0.12 kW - 11 kW Operating Instructions (Compact)
Language: English · Version 10/06
Manual
MICROMASTER 420 Parameter List
MICROMASTER 420 Parameter List
Language: English · Version 10/06
Data sheet
Data sheet for article 6SE6420-2UD21-5AA1 (generated by the Siemens Industry Mall)
Data sheet for article 6SE6420-2UD21-5AA1 (generated by the Siemens Industry Mall)
Language: English
Only as a spare part. For every MICROMASTER 420 article number we checked, Siemens records 'Prod. Cancellation' from 1 October 2019 and calls the item a 'spare part'; support entry 109746454 also says the product can still be ordered although the type is cancelled. We found no Siemens statement of when that stops. Availability and lead time are confirmed on enquiry, and for a new design or for stocking it is better to look at the SINAMICS replacement first.
According to Siemens' migration brochure (07/2022): SINAMICS G120C for 3-phase 400 V input (up to 132 kW), the modular SINAMICS G120 for 1- or 3-phase 230 V input (up to 55 kW), and SINAMICS V20 for small ratings. Siemens' own example: 6SE6420-2UD21-5AA1 (1.5 kW, rated current 4.0 A) to 6SL3210-1KE15-8UB2 (G120C, base load current 4.1 A). That G120C code is an 'Active Product' in SiePortal. Select by the rated output current on the rating plate, not by power alone.
From the order number on the rating plate: 6SE6420- for the MM420, 6SE6430- for the MM430 and 6SE6440- for the MM440. If the plate is unreadable: the MM420 stops at 11 kW and has three digital inputs, one analog input, one relay and one analog output. The MM430 starts at 7.5 kW and is made for pumps and fans; the MM440 reaches 250 kW and has vector control. Both have six digital inputs, two analog inputs and three relays.
Siemens calls the compatibility of SINAMICS with MICROMASTER 4 'restricted'. For the MM440 the same Siemens writes explicitly that a direct migration of the project to a G120 control unit is not possible because the parameter structure has changed, and the drive must be recommissioned. We found no separate Siemens migration guide for the MM420, so assume the same. The Siemens Retrofit Kit has a parameter conversion tool, but its page names only 'MICROMASTER' and we could not confirm that MM4 is covered.
Yes. Every code we checked carries 'Prod. Cancellation' from 1 October 2019: the BOP panel (6SE6400-0BP00-0AA1), the AOP panel (6SE6400-0AP00-0AA1), the PROFIBUS module (6SE6400-1PB00-0AA0), the CANopen module (6SE6400-1CB00-0AA0) and the PC connection kit (6SE6400-1PC00-0AA0). The older BOP code ending 0AA0 (6SE6400-0BP00-0AA0) is at 'End Prod.Lifecycl.' in SiePortal and Siemens shows the 0AA1 version as its successor.
MICROMASTER 430
Siemens MICROMASTER 4 converter for pumps and fans, from 7.5 kW to 250 kW; Siemens has cancelled it and points to SINAMICS G120X as the replacement
اینورتر فشار ضعیف
Has a successor
MICROMASTER 440
Versatile Siemens MICROMASTER 4 converter with vector control, from 0.12 kW to 250 kW; Siemens has cancelled it and points to the modular SINAMICS G120 as the replacement
اینورتر فشار ضعیف
Has a successor
SINAMICS G120C
Compact one-piece Siemens frequency converter from 0.55 kW to 132 kW for a three-phase 380 V to 480 V supply; control and power sections in one housing, with an integrated STO safety function
اینورتر فشار ضعیف
SINAMICS G120
Modular Siemens frequency converter from 0.55 kW to 250 kW, with a separate control unit and power module and integrated safety functions up to SIL 2
اینورتر فشار ضعیف
SINAMICS V20
Siemens basic-performance converter for simple motion sequences, from 0.12 kW to 30 kW; single-phase 200 V to 240 V and three-phase 380 V to 480 V, with a built-in BOP and USS/Modbus RTU, needing no extra modules
اینورتر فشار ضعیف
Send your order code or requirement; after a technical review we give you the price and delivery time.