A1N040TW-2 — thermal-magnetic motor circuit protector, EOL hot
The ABB A1N040TW-2 is a thermal-magnetic motor circuit protector from the A1N 100 TMF 40-400 series, rated 40 A continuous with a 400 A magnetic trip threshold.
What the thermal-magnetic type means for the panel
Thermal-magnetic means the device combines a bimetal thermal element for overload protection (the 40 A continuous rating) with a solenoid magnetic element for short-circuit trip (the 400 A threshold). This is a motor circuit protector — it sits between the contactor and the motor, not as a standalone branch-circuit breaker. The A1N 100 frame size indicates the physical envelope; the TMF 40-400 suffix confirms the trip range. In a motor control centre or panel, this unit mounts on DIN rail and coordinates with the upstream short-circuit protective device. The 400 A magnetic trip is instantaneous — it clears a bolted fault before the thermal element responds, protecting the contactor and motor leads.
Sourcing an EOL-hot ABB part
The part is available through independent surplus and broker channels; quantities are lot-specific and confirmed at RFQ. No pin-compatible drop-in replacement from the same family is documented — a functional replacement would require reviewing the motor FLA and coordination study. The ABB brand and the A1N 100 TMF 40-400 description confirm this is a genuine ABB-manufactured unit, not a third-party relabel. Compliance documentation (RoHS, REACH, CE) is per ABB's original release — the buyer should verify the specific lot's declaration at order.