What type of device is this?
This is an auxiliary contactor, also described as a contactor relay, from the Siemens 3TH4 range. It is designed for control and switching duties where multiple auxiliary contacts are needed within a panel or machine control circuit.
What contact arrangement does it provide?
This unit provides 8 auxiliary contacts in total, made up of 4 normally open contacts and 4 normally closed contacts. This 4NO + 4NC arrangement makes it suitable for signalling, interlocking and control logic duties.
What is the coil voltage for this version?
For the commonly referenced Siemens 3TH4244-0AV0 configuration associated with this listing, the control coil is rated at 400 V AC at 50 Hz and 480 V AC at 60 Hz.
Is it suitable for DIN rail mounting?
Yes. The device is designed for both screw mounting and snap-on mounting to a 35 mm standard DIN rail in accordance with DIN EN 50022, which makes it practical for control cabinet installation.
What type of terminals does it use?
It uses screw-type terminals for both the auxiliary circuit and the control circuit. This style is widely used in industrial panels where secure, conventional wiring connections are preferred.
What are the overall dimensions?
The stated dimensions are 78 mm high, 45 mm wide and 102 mm deep. These compact proportions can help when planning layout space in a control enclosure.
What is the operating temperature range?
The specified ambient operating temperature range is -25 °C to +55 °C. This makes the unit suitable for a broad range of industrial indoor environments, provided the wider installation conditions are appropriate.
What is the switching current rating in AC-15 duty?
The AC-15 operational current is rated at 10 A at 230 V and 6 A at 400 V. These figures are useful when assessing suitability for control circuit switching applications involving electromagnetic loads.
Does it include changeover contacts?
No. This configuration does not include changeover contacts. It is arranged purely with separate normally open and normally closed contacts.
Are any of the contacts timed or mechanically overlapping?
No. The listed contact arrangement does not include delayed switching, leading contacts, lagging contacts or make-before-break switching. It is a standard auxiliary contact configuration.
What is the front protection rating?
The front protection rating is IP00. This means the device is intended for installation within a suitable enclosure or electrical assembly rather than exposed use.
Where is this kind of auxiliary contactor typically used?
Units of this type are commonly used in control panels, factory automation systems, motor control assemblies, signalling circuits and interlock arrangements where multiple auxiliary contact states need to be switched reliably from one coil input.