Technical Parameters
Electrical Ratings
Current Setting Range: ~65–90 A (adjustable)
Number of Poles: 3 (protects three phases)
Trip Class: 10A (industrial motor protection characteristic)
Rated Operational Voltage (Main Circuit): up to 690 V AC
Rated Insulation Voltage (Ui): 690 V
Rated Impulse Withstand Voltage (Uimp): 6 kV
Rated Frequency: 50 / 60 Hz (AC) and also operable for DC auxiliary circuits
Protection & Functional Features
Motor Protection: Thermal overload protection with phase loss sensitivity
Reset Options: Manual or automatic reset selectable
Trip‑Free Mechanism: Yes
Stop & Test Functions: Integrated on front
Ambient Temperature Compensation: Yes (for reliable trip response over –25 °C to +55 °C)
Trip Indication: Visible on front
Auxiliary Contacts
Auxiliary Contact Configuration:
1 NC (normally closed) — trip contact
1 NO (normally open) — signal contact
Auxiliary Contact Ratings (AC‑15):
~3 A @ 120 V AC
~1.5 A @ 240 V AC
~1.9 A @ 400 V AC
~1 A @ 440–500 V AC
Auxiliary Contact Ratings (DC‑13):
~1.25 A @ 24 V DC
~0.25 A @ 125 V DC
~0.12 A @ 250 V DC
Installation & Connection
Mounting: Direct mount on compatible contactors (e.g., A/AF line) or separate base mounting with accessory kit
Terminal Type: Screw terminals for main and auxiliary circuits
Connecting Capacity:
Main Circuit: Flexible/rigid conductors up to ~35 mm²
Auxiliary Circuit: Flexible with ferrules ~0.75–2.5 mm², rigid up to ~4 mm²
Tightening Torque:
Main circuit ~7.2 … 9.6 N·m
Auxiliary circuit ~1.0 … 1.3 N·m
Environmental & Mechanical
Degree of Protection:
Housing: IP20
Main Circuit Terminals: IP10
Pollution Degree: 3
Operating Ambient Temperature: approx. –25 °C to +55 °C with compensation
Storage Temperature Range: approx. –40 °C to +70 °C
Mounting Position: Standard vertical orientation recommended
Approx. Dimensions: ~80 mm (W) × 120 mm (H) × 120 mm (D)
Net Weight: ~0.75 kg
The ABB TA110DU‑90M is a robust thermal overload relay designed to protect three‑phase motors and associated circuits against overload, phase loss, and locked rotor conditions. It is part of ABB’s TA110DU series of electromechanical overload relays intended for use with compatible contactors in motor starter assemblies.