Siemens 3RT2025-1KB40 Power Contactor 3P 17A 7.5kW 24V DC

The Siemens 3RT2025-1KB40 is a SIRIUS 3RT2 series 3-pole power contactor rated at 17 A (AC-3) and 7.5 kW at 400 V, with a 24 V DC control coil operating across 0.7-1.25 x Uc. Frame size S0 and screw terminal connections make it suitable for direct connection to PLC digital outputs in compact industrial control panels.

Technical specifications:

• MLFB: 3RT2025-1KB40
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Power contactor (3RT2)
• Frame size: S0
• Number of poles: 3
• Rated current AC-3: 17 A (400 V / 500 V), 13 A (690 V)
• Rated current AC-1: 40 A at 400 V (40°C)
• Rated operating power AC-3: 7.5 kW at 400 V / 500 V
• Insulation voltage: 690 V (main and auxiliary circuit)
• Surge voltage resistance: 6 kV (main and auxiliary circuit)
• Control supply voltage: 24 V DC
• Control voltage range: 0.7-1.25 x Uc
• Surge suppressor: plugged-in varistor
• Auxiliary contacts: 1 NO + 1 NC
• Terminal type: screw terminal
• Closing / holding power: 4.5 W
• Maximum operating frequency: 1,000 operations/h (AC-3)
• Mechanical service life: 10,000,000 operating cycles
• Operating temperature: -25...+60°C
• Storage temperature: -55...+80°C
• Maximum installation altitude: 2,000 m
• Net weight: 584 g
• Auxiliary switch: cannot be added

Features and benefits:

• Wide control voltage range (0.7-1.25 x Uc) allows direct connection to PLC digital outputs without additional interface relays
• Plugged-in varistor provides integrated coil surge suppression without additional components
• Mechanical service life of 10,000,000 operating cycles supports high-duty industrial applications
• Low hot-state power loss of 1.8 W total (0.6 W per pole) reduces heat build-up in compact enclosures
• Insulation voltage rated to 690 V covers a wide range of industrial supply systems

Applications:

• Switching three-phase induction motors up to 7.5 kW in machine and plant automation
• Direct interfacing with PLC digital outputs in control panel assemblies
• Motor starting and stopping in conveyor, pump, and compressor systems
• Motor control centers requiring compact S0 frame contactors

Compliant with EN 60947-1. Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2025-1KB40, SIRIUS 3RT2 power contactor 24V DC, Siemens S0 contactor 17A.