Siemens 3RT2025-1BB44 Power Contactor 17A 7.5kW/400V 3P 24V DC

The Siemens 3RT2025-1BB44 is a SIRIUS 3RT2 3-pole power contactor rated at 17 A and 7.5 kW at 400 V (AC-3/AC-3e). It operates on a 24 V DC control coil and includes 2 NO + 2 NC auxiliary contacts in size S0 with screw terminals and a removable auxiliary switch.

Technical specifications:

• MLFB: 3RT2025-1BB44
• Manufacturer: Siemens
• Product line: SIRIUS
• Product type: Power contactor (3RT2)
• Size: S0
• Number of poles: 3
• Rated current AC-3/AC-3e at 400 V: 17 A
• Rated current AC-3/AC-3e at 690 V: 13 A
• Rated current AC-1 at 400 V / 40°C: 40 A
• Operating power AC-3 at 400 V: 7.5 kW
• Operating power AC-3 at 690 V: 11 kW
• Control supply voltage: 24 V DC
• Auxiliary contacts: 2 NO + 2 NC
• Terminal type: Screw terminal
• Insulation voltage (main and auxiliary): 690 V
• Surge voltage resistance (main and auxiliary): 6 kV
• Mechanical service life: 10,000,000 operating cycles
• Operating frequency AC-3: max 1,000 cycles/h
• Closing and holding power (DC coil): 5.9 W
• Closing delay DC: 50 - 170 ms
• Opening delay DC: 15 - 18 ms
• Operating temperature: -25 ... +60°C
• Storage temperature: -55 ... +80°C
• Installation altitude: max 2,000 m
• Net weight: 645 g
• Power loss at rated AC current (hot state): 1.8 W

Features and benefits:

• Removable auxiliary switch block allows flexible adaptation without replacing the base contactor
• Mechanical service life of 10,000,000 operating cycles supports high-cycle industrial applications
• Wide operating temperature range from -25 to +60°C suits demanding installation environments
• Low DC coil power consumption of 5.9 W for both closing and holding reduces panel heat load
• Rated across AC-3, AC-3e, AC-4, and multiple DC load categories for versatile deployment
• Compact S0 size with screw terminals simplifies installation in standard control panels

Applications:

• Direct-on-line starting and stopping of three-phase AC motors in industrial control panels
• Reversing and star-delta motor starter assemblies
• Pump, compressor, and fan motor switching in HVAC and building services
• DC load switching using multiple current paths in series configurations
• Machine tool and conveyor control circuits requiring integrated auxiliary contacts

Compliant with EN 60947-1 (protective separation between coil and main contacts rated to 400 V). Part of the Siemens SIRIUS 3RT2 range.

Also known as: Siemens 3RT2025-1BB44, SIRIUS 3RT2 power contactor S0, 3RT2025 24V DC coil contactor.