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Siemens 3TX7003-1CB00 SIRIUS Coupling Relay

Siemens 3TX7003-1CB00 SIRIUS Coupling Relay

Item NO.: 3742422
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Condition : brand new in factory sealed box


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Detail

  • Product NameSiemens 3TX7003-1CB00 SIRIUS Coupling Relay
  • Item NO.3742422
  • Weight1.0000 kg = 2.2046 lb = 35.2740 oz
  • CategoryPLC
  • BrandSiemens
  • Creation Time2026-08-20
Siemens 3TX7003-1CB00 | SIRIUS Coupling Relay

3TX7003-1CB00

SIRIUS Coupling Relay Siemens 2 NO · 24-240 V AC/DC
3TX70 Series · Interface Relay
Overview Specifications Features Applications Lifecycle FAQ Recommended Models

Overview

3TX7003-1CB00 is an interface/coupling relay from Siemens' SIRIUS 3TX70 series, designed for electrical isolation, voltage conversion, signal amplification, and contact multiplication in industrial control circuits. It is a non-socket version (3TX700) of the interface relay family.

The device features 2 NO (normally open) contacts and operates on a wide voltage range of 24…240 V AC/DC, making it highly versatile for various control applications. It uses spring-type terminals (cage clamp) for secure and quick wiring.

The 3TX7003-1CB00 is designed for compact electrical cabinets and offers a manual/automatic switch for easy commissioning. It includes integrated protection circuits for the input and supports operation in ambient temperatures up to 60°C.

SIRIUS 3TX70 2 NO contacts 24-240 V AC/DC Spring-type terminals Interface relay
Key details
  • Siemens SIRIUS 3TX70 Series
  • Coupling/interface relay
  • 2 NO contacts
  • Wide voltage range
  • Spring-type terminals

Specifications

Electrical specifications

Manufacturer Siemens
Model 3TX7003-1CB00
Series SIRIUS 3TX70
Product type Coupling/Interface Relay
Control voltage range 24…240 V AC/DC
Number of contacts 2 NO
Terminal type Spring-type (Cage Clamp)
Country of origin Czech Republic

Physical & environmental

Mounting DIN rail (EN 50022)
Temperature range Up to 60°C (with wide voltage range)
Input protection Integrated protection circuit
Manual/Auto switch Yes, for commissioning
Approvals IEC 60947-5-1, EN 60947-5-1
RoHS compliant Yes
Note: This product is part of the 3TX700 series (non-socket version). The 3TX701 series are socket-type relays.

Features

Versatility & convenience

  • Wide voltage range — Operates from 24 V to 240 V AC/DC, reducing the number of relay variants needed in stock.
  • Manual/Auto switch — Integrated switch simplifies commissioning and testing without additional wiring.
  • Compact design — 22.5 mm width saves space in electrical cabinets, suitable for shallow cabinets and close mounting rail spacing.

Robustness & protection

  • Input protection — Integrated protection circuit safeguards the input against overvoltage and EMC interference.
  • Wide temperature range — Maintains wide operating voltage range at temperatures up to 60°C.
  • Spring-type terminals — Cage clamp terminals provide fast, secure, and vibration-resistant wiring without special tools.

Applications

The 3TX7003-1CB00 is widely used in industrial control systems for signal conditioning and load switching.

Electrical isolation
Voltage conversion (e.g. 24V DC to 230V AC)
Signal amplification
Contact multiplication
Motor control circuits
PLC output interfacing
Control cabinet integration
General relay control
Typical industries: Machine building, automotive manufacturing, packaging machinery, chemical processing, and general industrial automation.
Key applications: The 3TX7003-1CB00 is ideal for interfacing between PLCs and field devices, providing electrical isolation and load switching where different voltage levels are used.

Lifecycle

Phased-out no longer in active production — limited availability

Product status: The 3TX7003-1CB00 has been phased-out by Siemens and is no longer in active production. It may still be available through surplus stock or authorized distributors as a legacy spare part for existing systems.

Spare parts & support: Replacement units and accessories are available through Siemens' standard support channels and authorized distributors, but availability may be limited. For new installations, the successor solution is strongly recommended.

Replacement & migration:

Recommended successor: Siemens recommends migrating to the SIRIUS 3RQ series or the 3RS series interface relays, which offer similar functionality with enhanced features and long-term availability.
  • The 3RQ series offers improved energy efficiency and diagnostics.
  • When replacing the 3TX7003-1CB00, verify the control voltage range and contact configuration to ensure compatibility.
  • The 3RQ series is designed for long-term availability and continued support.
Related models: 3RQ2061-1CB00 (potential successor), 3TX7003-1AB00 (similar variant, screw terminals), 3TX7004-1CB00 (6.2 mm width variant)

Recommendation: For new installations, we strongly recommend the successor 3RQ2061-1CB00 or other current SIRIUS 3RQ series relays. For existing systems, procuring spare units while available is advisable.

FAQ – Frequently Asked Questions

Q1: Is the 3TX7003-1CB00 still available for new installations?

No. Siemens has phased out this product and it is no longer in active production. For new installations, we recommend migrating to the 3RQ series.

Q2: What is the control voltage range of 3TX7003-1CB00?

It operates on a wide voltage range of 24…240 V AC/DC, making it compatible with both AC and DC control circuits.

Q3: How many contacts does 3TX7003-1CB00 have?

It features 2 NO (normally open) contacts.

Q4: What type of terminals does 3TX7003-1CB00 use?

It uses spring-type (cage clamp) terminals for fast, secure, and vibration-resistant wiring.

Q5: What is the difference between 3TX700 and 3TX701 series?

3TX700 series are non-socket type relays with fixed spring or screw terminals. 3TX701 series are socket-type relays that can be quickly replaced without rewiring.

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