3RT2025-1FB40

Siemens 3RT2025-1FB40 DC 24V coil with diode suppression screw terminal contactor
Siemens 3RT2025-1FB40 DC 24V coil with diode suppression screw terminal contactor

S00 frame 3-pole AC contactor, 24V DC coil with built-in plug-in diode suppression module, 1NO+1NC auxiliary contacts with mirror contact function, screw terminals.

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Siemens 3RT2025-1FB40 DC 24V coil with diode suppression screw terminal contactor
Product Positioning

The 3RT2025-1FB40 belongs to the SIRIUS 3RT2 series S00 frame contactor. Its control coil is 24V DC and it features a plugged-in diode combination. This combination absorbs back EMF surges when the coil is de-energized, reducing interference and loss risks to PLC output points or relay contacts in the same control circuit. It is particularly suitable for applications where a PLC directly drives a small contactor coil. The auxiliary contacts provide 1 NO + 1 NC and have mirror contact capability, which can be used in safety interlock circuit designs requiring reliable feedback of the main contact status. The main circuit maintains the 3RT2025 family's standard AC-3 17A/7.5kW (400V) capability. The terminals are screw-type, and the dimensions are 85×45×107mm, weighing approximately 0.597kg. Due to the built-in diode module, its depth is slightly greater than the non-diode version in the same series by about 10mm.

Core Product Advantages and Features
Built-in diode surge suppression
The back electromotive force at the moment of coil de-energization is absorbed by the plug-in diode module, protecting the PLC output or relay contacts from surge losses.
Suitable for direct PLC drive
After the coil current is suppressed, the interference to the control circuit is reduced, and it can be directly driven by the PLC output point without the need for additional surge protection components.
Mirrored contact design
The 1NO+1NC auxiliary contact has mirror contact capability and can be used in safety interlock circuits that require reliable feedback of the main contact status.
Standard installation of screw terminals
Both the main circuit and the auxiliary circuit use screw terminals, which conforms to general wiring and periodic inspection practices.
project Specification
Series Specifications SIRIUS 3RT2025, S00 chassis (smallest size)
Number of poles/main contacts 3 poles, 3 sets of normally open (NO) main contacts
AC-3 rated current 17 A (400V)
AC-3 rated power 7.5 kW (400V)
control coil 24 V DC, with built-in plug-in diode suppression module
auxiliary contacts 1NO + 1NC (with mirror contact function)
Terminal type Screw-type terminals, both main and auxiliary circuits are the same.
External dimensions (height × width × depth) 85×45×107 mm
weight 0.597 kg
Action Delay (DC) Closing time: approximately 50–170 ms / Opening time: approximately 15–17.5 ms
Rated insulation voltage 690 V
Mechanical life 10 million operation cycles
Protection level IP20
Approval and certification UL, CSA, CCC, KC, EAC

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