Overview
Manuals
Current Adjustment
Fuse Coordination
Trip Circuit
Features:
- A defined 1.30-1.80 A adjustment band and class 10A bimetal characteristic provide overload protection for appropriately selected motor circuits.
- Phase-loss sensitivity and separate NC/NO auxiliary contacts support contactor tripping and an independent overload indication.
- Selectable manual or automatic reset, temperature compensation and TEST/STOP controls allow the relay to be integrated into the approved starter-control scheme.
TA25DU-1.8M 1SAZ211201R2025 is the 1.30-1.80 A member of ABB's TA25DU-M thermal overload relay family. Motor current passes through its three bimetal sensing elements; sustained overload operates the trip mechanism and changes the auxiliary-contact states. The relay does not interrupt a short-circuit fault by itself: it works with a contactor and an appropriately coordinated protective device. Its class 10A designation describes the thermal tripping characteristic rather than the adjustable current limit.
The setting should reflect the motor nameplate and approved starter design within the available adjustment band. The normally closed 95-96 circuit is used for tripping, while the separate normally open 97-98 circuit provides status signaling. Manual and automatic reset produce different restart conditions, so the original control arrangement must be reviewed before that choice is changed. Contactor fit, fuse coordination and conductor termination remain relevant even when the complete ABB order number matches; any separate mounting kit is an additional assembly component.
The TA25DU-1.8M ABB Thermal Overload Relay is listed as Active / Available from OEM. Current revision, availability and supplied scope are confirmed in the written quotation.
ABB TA25DU-1.8M documentation and reference links.
Important Notice: Every linked document must identify the listed model or its documented family. Confirm the complete order code, hardware revision and installed-system requirements before replacement.
This execution covers 1.30-1.80 A. Set the front dial to the motor and approved starter design, retaining the documented setting during replacement. The upper value in the model name is not an instruction to set every motor to 1.8 A. Starting duration and loading must also suit the class 10A characteristic.
ABB's catalogue row for 1SAZ211201R2025 lists 6 A gG or 4 A aM fuse coordination. These values are linked to the published starter and short-circuit conditions; they are not universal circuit-breaker substitutes. Confirm the receiving contactor, prospective fault level and protective-device arrangement before applying the combination.
Contact 95-96 is the normally closed trip path; 97-98 is a separate normally open indication path. Restore their original circuit assignments and check the TEST and STOP functions with the starter isolated and controlled by qualified personnel. Automatic reset must not cause an unintended motor restart.
