Product Overview

The SIMATIC S7-300 Front Connector (MLFB: 6ES7392-1AJ00-0AA0) is a compact, robust 20-pole connector designed for S7-300 signal modules. It features screw-type terminals, ensuring secure and reliable connections in demanding industrial environments. Compatible with both solid and ferruled wiring, this connector streamlines front-end wiring tasks.
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Technical Specifications

Connection Method

Screw terminals, allowing either a single conductor or two conductors (total ≤ 1.5 mm²) in a shared ferrule.
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Supported Cable Sizes

Solid or flexible conductors (with or without end sleeves) from 0.25 mm² to 1.5 mm² (AWG 24–16).
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Recommended stripped length: 6 mm for both cable types.
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Mechanical Requirements

Tightening torque range: 0.4 N·m to 0.7 N·m

Recommended screwdriver: Conical tip, 3–3.5 mm.
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Physical Dimensions & Weight

Width: 23 mm

Height: 131 mm

Depth: 36 mm

Weight: Approx. 70 g.
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Environmental Ratings

Operating temperature: 0 °C to +60 °C

Storage/transport temperature: –40 °C to +70 °C
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Product Lifecycle & Logistics

Lifecycle Status

Active product, designated as a service part. Product phase-out announced as of October 1, 2023.
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Availability & Packaging

Ships ex-works in 1 day.

Net weight: ~0.069 kg; packaging dimensions: 4.20 × 14.30 × 2.90 cm.
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Origin & Compliance

Made in Germany.

RoHS compliant since January 1, 2006.

WEEE take-back applies.

Contains Perfluorobutane sulfonic acid (PFBS) (>0.1% w/w) — disclosed per REACH Article 33; safe under intended use.
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Classification Codes

eClass 12 / 14: 27-24-22-92

ETIM 7/8/9: EC002584

UNSPSC 15: 32-15-17-03
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Engineering Insights

Reliable Industrial Connections
Screw contacts offer exceptional mechanical retention and electrical conductivity—especially valuable in vibration-prone environments.

Flexible Wiring Options
Accommodating both single cables and ferruled pairs makes it adaptable to diverse wiring layouts and conductor preparations.

Compact Design with Easy Install
Slim 23 mm width helps conserve DIN rail space. Standardized tool compatibility ensures rapid, accurate installation.

Durable Across Conditions
Designed to handle temperature extremes from –40 °C to +70 °C, this connector withstands operational and storage challenges.

Support for Legacy Systems
Continues to serve as a dependable spare part for older SIMATIC S7-300 systems even after discontinuation. Replacement units can be installed without impact to wiring or module layout.

Suggested Product Page Description

Front Connector for S7-300 Signal Modules — 20-Pole, Screw Terminal (6ES7392-1AJ00-0AA0)
A compact, industry-grade front connector for the SIMATIC S7-300 system, delivering reliable and secure connections via screw terminals. Compatible with 0.25–1.5 mm² wiring, the connector supports both single and ferruled conductors, and includes essential installation accessories like a conical screwdriver specification for accurate torque. Rated for harsh environments, it offers a generous temperature range and enduring performance.

Key Advantages:

20 screw-type poles with flexible conductor options

Slim design (23 mm) fits tight cabinet layouts

Sturdy termination via 0.4–0.7 N·m torque range

Durable across –40 °C to +70 °C ranges

Fast shipping, RoHS and WEEE compliant, German-made quality

Ideal continuity solution post phase-out (since Oct 2023)