CA4-10 ABB Thermal overload relay Provide reliable motor protection

Product Overview

ABB CA4-10 is a compact thermal overload relay in the ABB CA4 series, specifically designed to protect small three-phase asynchronous motors (rated current 0.1-10A) from overload and phase loss faults. This model is equipped with one normally open (NO) auxiliary contact and supports automatic reset function. It can be directly assembled with ABB A series contactors to form an integrated motor starting and protection unit. With high reliability, modular structure and international certification, it is widely used in industrial control cabinets, building automation systems and OEM equipment.

Key features

✅ precise overload protection

Adopting the principle of bimetallic strip thermal sensing, the tripping characteristic complies with the IEC/EN 60947-4-1 standard (Class 10A), ensuring that the power supply of the motor is cut off in time when overloaded.

✅ phase loss protection function

It is equipped with a built-in three-phase current imbalance detection mechanism. Once any phase is disconnected, it will trigger a trip to prevent the motor from burning out due to single-phase operation.

✅ space-saving & flexible installation

The width is only 45mm
Supports 35mm DIN rail mounting
It can be directly assembled on the right side of ABB A series contactors without the need for additional main circuit wiring
✅ security compliance

It has passed global mainstream certifications such as CE, UL, CSA, CCC, and TUV, and complies with RoHS and REACH environmental protection requirements.

✅ easy to maintain

The transparent window allows for a direct view of the tripping status. The reset button is easy to operate and supports upgrading to manual reset (optional accessories are required).

Basic parameters
Model CA4-10
Series ABB CA4 thermal overload relay
Rated operating current (Ie) 0.1-10 A (AC- 3,400 V)
Rated insulation voltage (Ui) : 690 V AC
Rated operating voltage (Ue) 230/400/690 V AC (50/60 Hz)
Auxiliary contact configuration 1 NO (Always open)
The deduction level is Class 10A
The reset mode is automatic reset (default), and the manual reset module is also available
Protection grade IP20 (front)
Installation method: 35mm DIN rail or assembled on A-series contactors
Operating temperature range: -25°C to +55°C
Storage temperature: -40°C to +85°C
Altitude ≤ 2000 m (no volume reduction)
Dimensions (width × height × depth) : 45mm × 90mm × 78mm
The weight is approximately 0.15 kg

Typical application scenarios
Industrial automation
It is used for the starting, stopping and protection of medium-voltage motors, such as water pumps, fans, compressors and other equipment.
Power transmission and distribution
Load switching and protection in scenarios such as medium-voltage switch cabinets and substations.
Energy and infrastructure
Auxiliary control of photovoltaic inverters, pumping stations of water treatment plants, and backup power switching systems.
OEM equipment integration
As a standard component embedded in the OEM control cabinet, it enhances the reliability of the entire machine.

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