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Siemens 6ES7921-3AD00-0AA0 — PLC Accessories

Siemens 6ES7921-3AD00-0AA0 Front Connector Module, S7-300, 2

MPN6ES7921-3AD00-0AA0

Siemens SIMATIC S7-300 front connector module, 20-pole, screw-type terminals, 60 V DC, 1 A rated, 4 A total, 0.25–1.5 mm² stranded, black enclosure.

$52.07 – $99.00Ref. price · indicative, final on quote
Siemens 6ES7921-3AD00-0AA0 datasheet (PDF)
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

6ES7921-3AD00-0AA0 — Identification
ParameterValue
Product designationFront connector module
Target systemSIMATIC S7-300
Suitability / intended use2A Output module

Connection & Wiring

6ES7921-3AD00-0AA0 — Connection & Wiring
ParameterValue
Number of poles20; of the front connector
Number of poles, 1st interface16; the IDC connector for the connection cable
Electrical connection type, connecting cablePlug-in connection
Conductor cross-section, stranded0.25 ... 1.5 mm²
Conductor cross-section, finely stranded (with ferrule)0.25 ... 1.5 mm²

Electrical

6ES7921-3AD00-0AA0 — Electrical
ParameterValue
Rated current1 A
Rated value60 V
Overvoltage category2

Mechanical

6ES7921-3AD00-0AA0 — Mechanical
ParameterValue
Mounting typedirect mounting
Terminal positionat the top
Cable length, max.30 m; between front connector module and terminal module

Environmental

6ES7921-3AD00-0AA0 — Environmental
ParameterValue
Operating temperature range0 ... 60 °C
Operating temperature range0 ... 60 °C
Storage temperature range-40 ... +70 °C
Pollution degree2

Approvals

6ES7921-3AD00-0AA0 — Approvals
ParameterValue
Ex e (EEx e) protection type testedNo

Product details

The Siemens 6ES7921-3AD00-0AA0 is a front connector module for the SIMATIC S7-300 system, designed to wire a 2A output module. It carries 20 poles on the front connector and provides screw-type terminals for the power supply (L+ and M, 2 x 1 each) plus a plug-in connection for the IDC cable. Rated at 60 V DC, 1 A per pole, with a total current limit of 4 A.

Wiring and termination specs

Accepts stranded wire 0.25–1.5 mm² with or without core-end processing. Solid conductors are not supported — use ferruled stranded only. Strip length is 6 mm. For the supply terminals, the wire insulation outer diameter must be ≤ 3.1 mm. Tightening torque for the screw terminals: 0.4–0.7 N·m, using a 3.5 mm screwdriver blade. Up to two wires per connection are allowed, provided the total cross-section fits in a single ferrule.

Frequently asked questions

What wire sizes does 6ES7921-3AD00-0AA0 accept?

It accepts stranded wire from 0.25 to 1.5 mm², with or without core-end processing. Solid wire is not supported.

What is the rated voltage and current for this front connector?

Rated voltage is 60 V DC. Rated current per pole is 1 A, with a total current limit of 4 A across all poles.

Where can I buy 6ES7921-3AD00-0AA0?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
6ES7921-3AD00-0AA0