Siemens 3RT2036-3KB40 SIRIUS Power Contactor 3P 51A 22kW 24VDC 1NO+1NC

The Siemens 3RT2036-3KB40 is a SIRIUS 3RT2 series 3-pole power contactor rated at 51 A and 22 kW at 400 V (AC-3/AC-3e), fitted with a 24 V DC coil for direct connection to PLC outputs. Frame size S2, it combines screw terminals on the main circuit with spring-loaded terminals on the control and auxiliary circuit, and includes an integrated varistor for coil circuit surge suppression.

Technical specifications:

• MLFB: 3RT2036-3KB40
• Manufacturer: Siemens
• Product line: SIRIUS
• Type designation: 3RT2
• Frame size: S2
• Number of main poles: 3
• Auxiliary contacts: 1 NO + 1 NC
• Rated current AC-3/AC-3e at 400 V: 51 A
• Rated current AC-1 at 400 V / 40 °C: 70 A
• Rated power AC-3 at 400 V: 22 kW; at 500 V: 30 kW
• Operating voltage (main circuit): up to 690 V AC
• Control supply voltage: 24 V DC; operating range 0.8-1.2 x Uc
• Surge suppressor: integrated varistor
• Main circuit terminals: screw terminal
• Control and auxiliary circuit terminals: spring-loaded terminal
• Insulation voltage (main and auxiliary circuit): 690 V (pollution degree 3)
• Surge voltage resistance (main and auxiliary circuit): 6 kV
• Mechanical service life: 10,000,000 operating cycles
• Operating frequency at AC-3: max 800/h
• Power loss at rated current (AC, hot state): 12 W
• Operating temperature: -25 to +60 °C
• Installation altitude: max 2,000 m
• Weight: 1.11 kg

Features and benefits:

• Integrated varistor removes the need for a separate external surge suppression module on the coil circuit
• Spring-loaded control terminals enable fast, reliable wiring without additional tooling
• 24 V DC coil with 0.8-1.2 x Uc operating range allows direct switching from standard PLC digital outputs
• 10,000,000 mechanical operating cycles supports long service life in frequent-switching applications
• Wide ambient temperature range (-25 to +60 °C) suits demanding industrial environments

Applications:

• Switching three-phase motors up to 22 kW at 400 V in AC-3 duty
• PLC-controlled motor starter panels and control cabinets
• Starting and stopping pumps, fans, and compressors in industrial installations
• Direct online motor starting in machine tools and conveyor systems

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

Also known as: Siemens 3RT2036-3KB40, SIRIUS 3RT2 contactor 51A 24VDC, Siemens S2 power contactor 22kW.