SIEMENS
SIEMENS 3RT20241BB40 contactor 1NC/1NO 24V DC 3P
IEC magnetic contactor with 1NO/1NC auxiliary contacts, 24V DC coil, three poles, 12A inductive and 40A resistive ratings, screw terminals, DIN-rail or surface mount
- Reliable motor control with 12 A inductive rating
- Handles resistive loads up to 40 A
- Compact 2.2 in width fits tight panels
- Standard DIN-rail or surface mounting flexibility
- 24 V DC coil suits low-voltage automation
IEC Magnetic Contactor for Motor Control
The SIEMENS 3RT20241BB40 is a three-pole IEC magnetic contactor designed for switching inductive loads up to 12 A and resistive loads up to 40 A. It operates on a 24 V DC coil and provides one normally open and one normally closed auxiliary contact. The unit mounts on DIN rail or directly on a surface and uses screw terminals for wiring.
Step up from smaller frame sizes when current
This S0 frame contactor replaces lower-rated starters when the application requires 12 A inductive or 40 A resistive capacity at 24 V DC control voltage. The jump is worth it when the existing contactor cannot handle the full-load current or when a non-reversing three-pole configuration is needed for motor starting duties.
Verify coil voltage, mounting space
Confirm the control circuit supplies 24 V DC before ordering. Check that the 4.1 in height and 2.2 in width fit within the enclosure and that DIN rail or surface mounting points are available. Ensure screw-terminal wiring suits the conductor sizes used in the panel.
Highlights
- Reliable motor control with 12 A inductive rating
- Handles resistive loads up to 40 A
- Compact 2.2 in width fits tight panels
- Standard DIN-rail or surface mounting flexibility
- 24 V DC coil suits low-voltage automation
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
What DIN rail or surface dimensions suit the 4.1 in height and 2.2 in width of this contactor?
The unit measures 4.1 in tall by 2.2 in wide and mounts on a standard DIN rail or directly on a flat surface using its integral mounting feet.
How do you wire the 24V DC coil and the three main poles using the screw terminals?
Strip each conductor, insert it into the appropriate screw terminal — coil terminals A1 and A2 for 24V DC, three main poles for the load — then tighten the screws to the specified torque.
When should the 1NO/1NC auxiliary contacts be inspected or replaced after switching 12 A inductive or 40 A resistive loads?
Inspect the auxiliary contacts during routine panel maintenance; replace them if contact resistance rises, pitting appears, or after the manufacturer’s rated electrical endurance for 12 A inductive or 40 A resistive duty is reached.
Also in this aisle
People compared these
Same shelf, same checkout — eight coins and a 30-minute rate lock.
