Siemens 3RT2036-1KB40 Power Contactor 51A 22kW 3P 24V DC

The Siemens 3RT2036-1KB40 is a 3-pole SIRIUS power contactor rated at 51 A and 22 kW / 400 V under AC-3e/AC-3 duty. It operates from a 24 V DC control supply with an operating range of 0.8-1.2 x Uc, and includes an integrated varistor for coil surge suppression, enabling direct connection to PLC outputs. Frame size S2 with screw terminals and 1 NO + 1 NC auxiliary contacts are supplied as standard.

Technical specifications:

• MLFB: 3RT2036-1KB40
• Manufacturer: Siemens
• Product line: SIRIUS
• Frame size: S2
• Number of poles: 3
• Rated current AC-3/AC-3e at 400 V: 51 A
• Rated current AC-1 at 400 V / 40°C: 70 A
• Rated current AC-4 at 400 V: 41 A
• Maximum operating voltage: 690 V
• Rated power AC-3 at 400 V: 22 kW
• Control voltage: 24 V DC, range 0.8-1.2 x Uc
• Auxiliary contacts: 1 NO + 1 NC
• Terminal type: screw terminal
• Insulation voltage (main and auxiliary circuit): 690 V
• Surge voltage resistance: 6 kV
• Operating temperature: -25 to +60°C
• Net weight: 1.12 kg

Features and benefits:

• Integrated varistor suppresses coil voltage spikes without external components
• Inrush current peak of 2.6 A / 50 µs permits direct switching by PLC outputs
• 10,000,000 mechanical operating cycles for extended service life
• Operating range 0.8-1.2 x Uc accommodates DC supply voltage variation
• Wide temperature rating of -25 to +60°C suits demanding industrial environments

Applications:

• Switching 3-phase motors up to 22 kW at 400 V under AC-3 duty
• PLC-controlled motor starter circuits in automation panels
• Capacitor bank switching up to 690 V (AC-6a rated)
• Motor plugging and inching applications (AC-4 rated at 400 V)

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

Also known as: Siemens 3RT2036-1KB40, SIRIUS 3RT2 power contactor 51A 24V DC.