Siemens SIRIUS 3RT2 3-Pole Power Contactor 65A AC-3 230V AC Coil 1NO+1NC Screw Terminals 3RT20451AP00

With a robust 65A AC-3 rating at 400V and a 30kW switching capacity, this SIRIUS 3RT2 contactor from Siemens is built for demanding motor control. The 3RT20451AP00 delivers reliable performance in industrial environments, backed by a 10 million cycle electrical endurance.

Overview

The Siemens SIRIUS 3RT2 series power contactor is a 3-pole device designed for switching three-phase loads up to 65A (AC-3) or 80A (AC-1) at 400V. It features a 230V AC coil, screw-type terminals for both main and auxiliary circuits, and a compact S3 frame size suitable for DIN rail or screw mounting. The contactor includes one normally open (NO) and one normally closed (NC) auxiliary contact for control and signaling.

What stands out

• High switching capacity: 30kW at 400V AC-3, ideal for motors and heavy loads.
• Long service life: mechanical and electrical endurance of 10 million cycles.
• Flexible mounting: screw fixing or 35mm DIN rail, IP20 protection.
• Wide operating temperature range from -25°C to +60°C.
• Compliant with IEC/EN 60947-4-1 standards.

Technical details

• Contactor size: S3
• Rated operational current (AC-3, 400V): 65A
• Rated operational power (AC-3, 400V): 30kW
• Rated operational current (AC-1, 400V): 80A
• Control supply voltage: 230V AC (50/60Hz)
• Auxiliary contacts: 1 NO + 1 NC
• Connection type: screw-type terminals (main and auxiliary)
• Degree of protection: IP20
• Mounting: screw fixing or 35mm DIN rail
• Electrical endurance (AC-3): 10,000,000 cycles
• Mechanical endurance: 10,000,000 cycles
• Operating temperature: -25°C to +60°C
• Standards: IEC 60947-4-1, EN 60947-4-1

Our verdict

A dependable workhorse for industrial motor control, the 3RT20451AP00 combines high current capacity with proven SIRIUS reliability. Its screw terminals and dual mounting options simplify installation, while the long electrical life reduces maintenance downtime.