Siemens 3TX7 Coupling Relays
Siemens 3TX7003-1CB00 Output Interface Coupling Relay
A 24 V AC/DC output interface coupling relay with two normally open auxiliary contacts, spring-loaded terminals and 22.5 mm mounting width.
Product Overview
Compact relay interfacing for 24 V control circuits
Siemens 3TX7003-1CB00 is an output interface coupling relay in the 3TX7 narrow-design range. The exact article uses a 24 V AC/DC control supply and provides two normally open auxiliary contacts.
The relay is fitted with spring-loaded terminals and uses snap-on mounting. Its official dimensions are 22.5 mm wide, 60 mm high and 62 mm deep.
Key Features
Official operating characteristics
24 V AC/DC
Rated for 24 V AC at 50 Hz and 60 Hz, and 24 V DC.
Two NO contacts
The auxiliary circuit contains 2 NO contacts, with 0 NC and 0 CO contacts.
3 A switching current
Operational current is 3 A at 110 V and 3 A at 230 V under AC-15.
0.1 A at 230 V
The official operational current at DC-13 and 230 V is 0.1 A.
Spring-loaded terminals
The terminal design supports the documented spring-connection wiring method.
Snap-on installation
The relay attaches by the official snap-on mounting method shown below.
Product Specifications
Siemens data for article 3TX7003-1CB00
| Brand | Siemens |
|---|---|
| Article number | 3TX7003-1CB00 |
| Product type | Output interface coupling relay |
| Control supply voltage, AC | 24 V at 50 Hz; 24 V at 60 Hz |
| Control supply voltage, DC | 24 V |
| Supply frequency | 50–60 Hz |
| Switching function | NO contact |
| Auxiliary contact type | Single contact |
| Auxiliary contacts | 2 NO; 0 NC; 0 CO |
| Operational current, AC-15 | 3 A at 110 V; 3 A at 230 V |
| Operational current, DC-13 | 0.1 A at 230 V |
| Electrical connection | Spring-loaded terminals |
| Fastening method | Snap-on mounting |
| Dimensions (W × H × D) | 22.5 × 60 × 62 mm |
| Net weight | 0.052 kg |
| Ambient temperature during operation | −25 to +60 °C |
Dimensions / Wiring / Installation
Official installation and -1CB00 circuit diagrams
Both drawings are taken from the Siemens 3TX7 operating instructions. The mounting view is explicitly labeled for 3TX7002 and 3TX7003, while the circuit view identifies the -1CB00 contact arrangement.
Lifecycle and Replacement Information
Siemens marks 3TX7003-1CB00 as phased out and identifies 3RQ2000-2BW00 as the preferred successor.
The successor is specified as an industrial-enclosure coupling relay with 2 CO contacts, a 24–240 V AC/DC wide-voltage range, 22.5 mm width and spring-type terminals.
FAQ
Siemens 3TX7003-1CB00 technical questions
What control supply does Siemens 3TX7003-1CB00 require?
Its rated control supply is 24 V AC at 50 or 60 Hz and 24 V DC.
How many output contacts does 3TX7003-1CB00 provide?
It provides two normally open auxiliary contacts. The official data lists 0 NC and 0 CO contacts.
Which terminal and mounting methods are used?
The article uses spring-loaded terminals and snap-on mounting.
What are the official dimensions and net weight?
The dimensions are 22.5 × 60 × 62 mm (W × H × D), and the net weight is 0.052 kg.
What is the official preferred successor?
Siemens identifies 3RQ2000-2BW00 as the preferred successor to the phased-out 3TX7003-1CB00.
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Contact Information
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