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Red thermal overload relay, compact boxed unit

ABB

ABB TA25DU-1.8 Thermal Overload Relay 1.8A 690V 3 Poles electrician tool

SKU CH-4N2M-25996 MPN TA25DU-1.8

Protects contactors up to 40 A with a 1.3–1.8 A thermal bi-metallic trip at class 10 and selectable manual or automatic reset

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Thermal bi-metallic protection for reliable motor safety
  • 3 to 1.8 amp adjustable range suits varied loads
  • Trip class 10 ensures fast overload response
  • Selectable manual or automatic reset simplifies maintenance
  • Compatible with A-Line contactors up to 40 frame size

What this relay does

The ABB TA25DU-1.8 is a thermal bi-metallic overload relay rated for 1.3 to 1.8 amps at 690 volts. It protects three-pole motor circuits by opening the contactor coil when sustained overcurrent heats the sensing elements. The unit carries a trip class 10 rating and offers selectable manual or automatic reset modes. It is designed for electricians and panel builders wiring motor starters up to the A40 frame size.

How it fits in a starter

This relay mounts directly onto A-Line contactors from the A9 through A40 frame range, including AE and AL variants. It requires a compatible contactor to operate the power contacts and coil circuit. The three-pole design matches standard three-phase motor wiring. Selectable reset lets the installer choose between automatic restart or manual intervention after a trip event. No separate mounting hardware is needed beyond the contactor itself.

When to choose this relay

Use this relay when the motor full-load current falls between 1.3 and 1.8 amps and the application demands IEC trip class 10 performance. It replaces older thermal units with fixed reset or narrower adjustment ranges. The jump is worth it when you need the flexibility of selectable reset on a contactor frame up to A40. It is not suited for loads exceeding 1.8 amps or for contactor frames larger than A40.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 89% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameABB
Model nameTA25DU-1.8
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

What is the trip class of the TA25DU-1.8 thermal overload relay?

The relay uses Trip Class 10, meaning it will trip within 10 seconds at 7.2 times the set current under sustained overload conditions.

How much heat does the bi-metallic element generate during continuous operation at 1.8 A?

The thermal bi-metallic design produces minimal heat at its rated 1.8 A; significant warmth only appears when current approaches the 1.3–1.8 A adjustment limit.

Which contactor frames must I already own to mount this relay?

It fits directly onto A-Line Series contactors in the A/AE/AL9 through A/AE/AL40 frame sizes.

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