SIEMENS
SIEMENS 3RT23251BB40 IEC Magnetic Contactor 24V DC 4P 1NO/1NC
Four-pole IEC magnetic contactor with 24 V DC coil, 16 A inductive and 35 A resistive ratings, 1NO/1NC auxiliary contacts and screw-terminal DIN-rail mounting
- IEC magnetic contactor for reliable motor switching
- 24 V DC coil voltage suits low-voltage control circuits
- 4-pole configuration handles three-phase loads with auxiliary contact
- 16 A inductive / 35 A resistive current ratings cover diverse applications
- DIN-rail or surface mounting on compact S0 frame size
IEC Magnetic Contactor 24 V DC
The SIEMENS 3RT23251BB40 is a four-pole IEC magnetic contactor designed for switching inductive loads up to 16 A and resistive loads up to 35 A. It operates from a 24 V DC coil and provides one normally open and one normally closed auxiliary contact. The unit suits control-panel builders who need a compact, non-reversing starter element for motor or heater circuits.
Thermals noise and power draw
The contactor carries a 16 A inductive and 35 A resistive rating within its S0 frame, so heat rise stays predictable in normal duty cycles. No fan or active cooling is fitted; operation is silent apart from the mechanical pull-in sound. Coil consumption at 24 V DC is low, keeping control-circuit demand modest for typical automation supplies.
Build quality and connectors
A screw-terminal layout accepts ring or fork lugs for secure wiring, while the housing mounts on standard DIN rail or directly on a panel surface. Overall dimensions are 5.1 in high by 4.7 in wide, fitting dense cabinet rows. The SIRIUS 3RT23 series construction meets IEC standards, and the open-frame design allows easy visual inspection of contact wear during maintenance.
Highlights
- IEC magnetic contactor for reliable motor switching
- 24 V DC coil voltage suits low-voltage control circuits
- 4-pole configuration handles three-phase loads with auxiliary contact
- 16 A inductive / 35 A resistive current ratings cover diverse applications
- DIN-rail or surface mounting on compact S0 frame size
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
How do I mount and wire the SIEMENS 3RT23251BB40 on a DIN rail without misplacing the screw-terminal connections?
Snap the S0 frame onto a standard DIN rail or surface-mount using the integrated clips, then tighten each screw terminal to the specified torque so the 4-pole main circuit and the 1NO/1NC auxiliary block are secured without cross-threading.
Which parts of the SIEMENS 3RT23251BB40 will need inspection or replacement after extended operation?
The main contacts rated for 16 A inductive and 35 A resistive loads, the 24 V DC coil, and the 1NO/1NC auxiliary contacts should be checked for wear, pitting, or coil degradation during scheduled maintenance.
What is the first thermal or current limit reached when the SIEMENS 3RT23251BB40 runs continuously at full load?
The 16 A inductive full-load current rating is the limiting threshold; sustained operation above this value will cause the contactor to exceed its design temperature rise before the 35 A resistive rating becomes relevant.
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