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Siemens 3RU21 Series

321 variants · Siemens

About the Siemens 3RU21 Series

The Siemens 3RU21 Series series groups 321 related part numbers, each listed with full specifications, a datasheet where available, and an RFQ option. The listed variants share a common mounting of Contactor mounting, temp operating max of 60 °C and temp operating min of -40 °C. Variants differ by depth, height and width, so you can match the exact depth your application requires using the selection guide below.

Select a variant by

Depth
85 mm · 105 mm · 125 mm
Height
85 mm · 90 mm · 105 mm
Width
45 mm · 55 mm · 70 mm

Shared specifications

Mounting
Contactor mounting
Temp operating max
60 °C
Temp operating min
-40 °C
Trip class
CLASS 10

Variant comparison

Parameter3RU2136-4HB03RU2136-4JB03RU2146-4MB03RU2126-4PB03RU2126-4FB03RU2126-4NB0
Depth105 mm105 mm125 mm85 mm85 mm85 mm
Height90 mm90 mm105 mm85 mm85 mm85 mm
Width55 mm55 mm70 mm45 mm45 mm45 mm

Request a quote on any Siemens 3RU21 Series part number and we confirm price, availability and lead time per line — including end-of-life and allocation-constrained variants.

All variants