Siemens

6SE6420-2UD21-5AA1

Name: 6SE6420-2UD21-5AA1
Brand: Siemens

11 sellers — below our five-seller verification bar

Market snapshot

Prices updated 20 Sep 2026 · next refresh 21 Oct

$139

Low

$429

High

Median $222 · 11 sellers · $83.03 below median at the lowest

Been quoted a price? See where it sits

$ Compare your quote against 11 current asking prices.

Asking prices for the exact catalog number 6SE6420-2UD21-5AA1 currently range from $139 to $429 across 11 sellers, observed 20 Sep 2026. Distributor product page: nexinstrument.com. Prices are published seller asking prices; shipping, taxes and negotiated trade pricing are not included.

Current listings

11 SELLERS · SORTED BY PRICE

Seller	Condition	Price	vs median	Listing
eBay - wacontrol	not stated	$138.51	-37%	View offer
eBay - ffr888	not stated	$144.83	-35%	View offer
eBay - plc-allbrandparts	not stated	$188.00	-15%	View offer
eBay - longpro*	not stated	$205.15	-7%	View offer
eBay - topservomotor	not stated	$219.98	-1%	View offer
eBay - fanuccontroller	not stated	$221.54	·	View offer
eBay - fabrication-plc	NEW	$253.66	+14%	View offer
eBay - ladderlogicstore	not stated	$258.63	+17%	View offer
eBay - blm-plc	not stated	$300.00	+35%	View offer
PLC Direct	not stated	$400.33	+81%	View offer
IQElectro	not stated	$429.00	+94%	View offer

Get quotes for this part

We forward your request to sellers who currently list the 6SE6420-2UD21-5AA1 at or below the market median. They quote you directly — we never see your pricing and take no commission.

Price watch

FREE · MONTHLY

Get an email when the market for the 6SE6420-2UD21-5AA1 moves: sellers appearing or disappearing, or the median shifting. One email per monthly refresh, and only when something changed. Unsubscribe any time.

Condition

AS STATED BY SELLERS

New	1
Not stated	10

Most industrial listings do not state condition — treat unstated as unknown, not as new. Across 666 comparable parts across the index, used and refurbished units are listed at a median 83% of the new price. These are asking prices, not sold prices, and the spread around that median is wide. Ask the seller to state condition in writing before comparing quotes.

Variants and similar numbers

VERIFY BEFORE ORDERING

Catalog number	Relationship	Sellers	Median	vs this part
6SE6420-2UD17-5AA1	one character apart	19	$342	+55%
6SE6420-2UD27-5CA1	one character apart	4	$1,730	+681%
6SE6420-2UD21-1AA1	one character apart	4	$467	+111%
6SE6420-2UD25-5CA1	one character apart	3	$930	+320%
6SE6420-2UC21-5BA1	one character apart	2	$526	+138%
6SE6420-2UD15-5AA1	one character apart	2	$373	+69%
6SE6420-2UD21-5AA0	one character apart	2	$545	+146%

These are different products that read almost identically on a purchase order. Google groups them together; we do not. Confirm the exact suffix against the nameplate before ordering.

Frequently asked

How much does a 6SE6420-2UD21-5AA1 cost?

As of 20 Sep 2026, the Siemens 6SE6420-2UD21-5AA1 is listed from $139 to $429 across 11 sellers. The median asking price is $222. Prices are published seller asking prices and are refreshed monthly.

Who sells the 6SE6420-2UD21-5AA1?

11 sellers currently list the 6SE6420-2UD21-5AA1, including eBay - wacontrol, eBay - ffr888, eBay - plc-allbrandparts. 2 of them are specialist industrial distributors. The lowest current asking price is $139 from eBay - wacontrol.

Why do 6SE6420-2UD21-5AA1 prices vary so much?

The highest asking price for the 6SE6420-2UD21-5AA1 is 3.1× the lowest. Industrial parts trade in a market where new surplus, refurbished stock and list-price sellers coexist without a shared price reference, so identical catalog numbers are listed at very different prices.